Greetings, welcome to the Semtech Corporation Q4 fiscal year 2021 earnings call. At this time, all participants are in a listen-only mode. A brief question and answer session will follow the formal presentation. If anyone should require operator assistance during the conference, please press star zero on your telephone keypad. As a reminder, this conference is being recorded. It is now my pleasure to introduce your host, Sandy Harrison, Vice President of Investor Relations. Thank you, Sandy. You may begin.
Thank you, Paul, welcome to Semtech's conference call to discuss the financial results for our fourth quarter and fiscal year 2021. Speakers for today's call will be Mohan Maheswaran, Semtech's President and Chief Executive Officer, and Emeka Chukwu, our Chief Financial Officer. The press release announcing our unaudited results was issued after the market close today, and is available on our website at semtech.com. Today's call will include forward-looking statements that include risks and uncertainties that could cause actual results to differ materially from the results anticipated in these statements. For a more detailed discussion of these risks and uncertainties, please review the safe harbor statement included in today's press release, and in the other risk factors section of our most recent periodic reports filed with the Securities and Exchange Commission.
As a reminder, comments made on today's call are current as of today only, and Semtech undertakes no obligation to update the information from this call should facts or circumstances change. During the call, we refer to non-GAAP financial measures that are not prepared in accordance with Generally Accepted Accounting Principles. All references made to financial results in Mohan's and Emeka's prepared remarks during this call will refer to non-GAAP financial measures, unless otherwise noted. A discussion of why the management team considers such non-GAAP financial measures useful, along with detailed reconciliations of such non-GAAP measures to the most comparable GAAP measures, are included in today's press release. With that, I will turn the call over to Semtech's Chief Financial Officer, Emeka Chukwu. Emeka?
Thank you, Sandy. Good afternoon, everyone. For Q4 fiscal 2021, net sales was $164.7 million, which came in above the upper end of our guidance. This represented a 7% sequential increase and 19% growth over the same period a year ago. Despite the challenges presented earlier in the year by the pandemic, fiscal year 2021 net sales increased 9% to $595.1 million, driven by the strength of the underlying secular themes driving our growth engines. In Q4, shipments into Asia represented 79% of net sales. North America represented 12%, and Europe represented 9%. Total direct sales represented approximately 13%, and sales to distribution represented approximately 87%. Our distribution business remains balanced, with 33% of the total POS coming from the high-end consumer end market, 37% coming from the infrastructure end market, and 30% from the industrial end market.
Q4 bookings increased significantly, both on a sequential and YoY basis, and was a new quarterly as well as annual record for fiscal year 2021, and resulted in a book-to-bill significantly above one. Those bookings accounted for approximately 24% of shipments during the quarter. The bookings strength has continued into Q1. Q4 GAAP operating expense increased 12% sequentially due to the impact of the 14-week quarter, impact of the weaker U.S. dollar, higher new product expenses, and stock-based compensation expense associated with the increase in our stock price. We expect our Q1 GAAP operating expense to decline from Q4 on the return to a 13-week quarter and lower stock-based compensation expense, slightly offset by the customary reset of expenses associated with the start of the new year, higher new product expenses, and the impact of the weaker U.S. dollar.
Q4 GAAP other expenses was $2.7 million versus $1.6 million in Q3, primarily due to the impairment of some of our minority investments and higher foreign exchange losses due to the weaker U.S. dollar. In Q4, our GAAP tax rate was 5.5% as a result of a more favorable regional mix of income. In Q1, we expect our GAAP tax rate to range between 9% and 11%. Our GAAP tax rate forecast excludes consideration of any impact from discrete items, including excess tax benefit or deficiency from the exercise of stock options. Moving on to the non-GAAP results, which exclude the impact of share-based compensation, amortization of acquired intangibles, acquisition-related and other non-recurring charges. Q4 non-GAAP gross margin of 61.5% was in line with our expectations, and we expect Q1 non-GAAP gross margin to be generally flat with Q4 levels, reflecting a high mix of consumer revenue.
In fiscal year 2022, we expect our gross margins to trend higher from a more favorable mix as we expect much of our revenue growth to come from our higher margin growth platforms. We expect that any increases due to the global supply chain constraints should be mitigated by slower customer pricing reductions, or in some cases, price increases. As a reminder, our long-term gross margin target model is 58%-63%. Q4 non-GAAP operating expense increased 9% to $62.3 million, driven by the impact of the 14th week, the negative impact of the weaker U.S. dollar, and higher new product expenses. In Q1, we expect non-GAAP operating expense to be approximately flat with Q4 levels, as the benefit of a normal 13-week quarter is offset by higher new product expenses, increased payroll expenses associated with the new year, and the impact of a weaker U.S. dollar.
For fiscal year 2022, we expect our non-GAAP operating expenses to grow about half the rate of our revenue growth. In fiscal year 2021, non-GAAP operating margin was 23.4%, a 60 basis point increase from fiscal year 2020. We expect to leverage revenue growth, stable and expanding gross margins, and reasonable operating expense growth to drive the operating margin to our target model of 32%-36%. In Q4, our non-GAAP tax rate decreased to 9.5% as a result of a favorable regional mix of income and discrete tax benefits. Beginning with our fiscal year 2022 results, we will use a non-GAAP normalized tax rate for the full fiscal year. We believe this will provide better comparability across our quarterly results by reducing the variability in non-GAAP tax rates that can occur throughout the year. We plan to update this tax rate annually at the beginning of each fiscal year.
For fiscal year 2022, our non-GAAP normalized tax rate is 13%. In fiscal year 2021, cash flow from operations was approximately $119 million, or 20% of our net sales, and free cash flow was approximately $87 million, or 15% of our net sales. Our long-term target for free cash flow is 25%-30% of net sales. We repurchased approximately 1.6 million, or $71 million of our shares in fiscal year 2021, which represents 82% of our free cash flow. The board recently increased our stock repurchase authorization by $350 million, resulting in approximately $389 million of outstanding authorization. We expect to continue to use our cash to opportunistically repurchase our shares, make strategic investments, and pay down our debt. Accounts receivable in Q4 represented 36 days of sales, which is below our target range of 40-45 days.
In Q4, net inventory increased 12% in absolute dollars from Q3, while days of inventory remained consistent at 118 days and remains above our target range of 90- 100 days. In Q1, we expect net inventory to increase in absolute dollars and days to support higher sales and to address the tighter supply chain. In summary, we are very pleased with our solid financial performance in fiscal year 2021, despite the many challenges from the pandemic. Our business fundamentals remain strong, we are well positioned to benefit from the secular drivers in the high-growth markets of IoT, communications infrastructure, and mobile devices. We expect to leverage our stable and expanding gross margin, our well-controlled operating expenses to grow our earnings much faster than revenue and continue to generate strong cash flow. I will now hand the call over to Mohan.
Thank you, Emeka. Good afternoon, everyone. I will discuss our Q4 fiscal year 2021 performance by end market and by product group, discuss our fiscal year 2021 performance, and then provide our outlook for Q1 of fiscal year 2022. In Q4 of fiscal year 2021, net revenues increased 7% sequentially to $164.7 million. Higher demand across all three of our end markets drove better than seasonal Q4 results. We posted non-GAAP gross margin of 61.5% and non-GAAP earnings diluted share of $0.51. In Q4 fiscal year 2021, net revenues from the high-end consumer market increased 10% sequentially and 32% over the prior year and represented 30% of total revenues. Approximately 19% of high-end consumer net revenues was attributable to mobile devices, and approximately 11% was attributable to other consumer systems.
Net revenue from the industrial end market increased 9% sequentially and 25% over the prior year and represented 33% of total net revenues. Net revenue from the infrastructure end market increased 3% sequentially and 7% over the prior year and represented 37% of total revenues. I will now discuss the performance of each of our product groups. In Q4 of fiscal year 2021, our Signal Integrity Product Group grew 1% sequentially and represented 38% of total revenues. Stronger demand from our PON and wireless base station business contributed to the growth. In Q4, demand from the data center market remained soft as customers continued to consume excess inventory following the strong first half. We believe inventory levels have reduced, and we are expecting data center revenues to grow in Q1.
Customer activity around our Tri-Edge PAM4 CDRs remains high, and we now have multiple design wins that are in various stages of qualification in 100G, 200G, and 400G PAM4 optical modules. We expect our Tri-Edge revenues to increase nicely in FY 2022 as customers move to full production. Our FiberEdge PMD platform, which complements our ClearEdge and Tri-Edge CDR platforms as well as DSPs, continues to gain solid momentum in 400G and 800G PAM4 optical systems. We are confident that Tri-Edge's lower power, lower cost, and lower latency together with FiberEdge's higher performance will enable us to continue to grow our hyperscale data center business and achieve another record in fiscal year 2022. In Q4 of FY 2021, our PON business grew nicely, driven by record 10G PON revenues as the ongoing demand for higher bandwidth connectivity is resulting in an increase in PON demand globally.
While the China market is expected to lead PON deployment growth in FY 2022, other global service providers, including in the U.S., India, and Europe, have also announced deployment plans that we believe bodes well for our 2.5G and 10G PON platforms. Semtech remains a leading supplier to the global PON market, providing the most comprehensive PON PMD portfolio. We expect our PON business to continue to grow and achieve another record performance in FY 2022. In Q4 of FY 2021, revenue from our wireless base station business increased nicely as our ClearEdge platform continued to establish a leadership position in 5G front haul optical modules. We also recently announced the availability of our new Tri-Edge 50G PAM4 platform targeted at 5G front haul optical modules.
We believe our established position in 4G, along with the 5G momentum from our new ClearEdge and Tri-Edge platforms targeted at front haul and mid-haul optical module applications, should enable our wireless base station business to deliver another record performance in FY 2022. The underlying secular demand, driven by the quest for higher bandwidth globally in data centers, PON, and wireless broadband networks, is expected to drive solid growth from our Signal Integrity Product Group in Q1 and in fiscal year 2022. Moving on to our Protection Product Group. In Q4 of fiscal year 2021, net revenues from our Protection Product Group increased 15% sequentially and 26% over the same period last year and represented 29% of total revenues. In Q4, our protection consumer business experienced better than seasonal demand, led by a recovery in smartphones following the weak start to the year due to COVID.
Stronger demand from our Asian smartphone customers, along with record revenue from our North American smartphone customers, contributed to the Q4 strength. In Q4, demand from the broad-based industrial markets was also stronger as our Protection Product Group continues to diversify into a broader range of industrial and communications markets, including the automotive and IoT markets. Semtech is a global leader in high-performance protection solutions, and our system designers use more advanced process geometries. The need for more robust protection to protect these sensitive devices will continue to increase. In addition, many of today's newer industrial systems and mobile platforms are using higher speed interfaces and advanced charging solutions where high-performance protection is required. We believe these secular trends will drive increasing adoption of our protection platforms used in mobile systems, displays, accessories, and increasingly across broad-based industrial, automotive, and communications platforms.
In Q1 of fiscal year 2022, we expect our protection revenues to be approximately flat. Turning to our wireless and sensing product group. In Q4 of fiscal year 2021, revenues from our wireless and sensing product group increased 6% sequentially and 32% over the prior year to achieve a new quarterly record and represented 33% of total revenues. In Q4, our LoRa-enabled platforms also delivered a new quarterly record, and we announced several key initiatives that demonstrate the increasing acceptance of LoRa in low-power IoT applications. These include the following. AWS announced the integration of the LoRaWAN protocol with AWS IoT Core, a fully managed service that enables IoT developers to easily connect low-power LoRa-based sensors to the AWS cloud. Swarm Technologies, a global satellite communications company, integrated LoRa into their platform that enables two-way communications to and from its LEO satellites.
LoRa is well suited for these long-distance, low-power applications, enabling satellite-based use cases for logistics, agriculture, connected cars, and energy. WITRAC, a developer of real-time location and telemetry capabilities, integrated LoRa into its global track and trace platform to enable customers to guarantee delivery times and maintain appropriate temperature of fresh food inside refrigeration units throughout the entire cold chain. Ripl Networks, a provider of IP networking of low-power devices, announced the use of LoRa in its IP mesh 3D location tracking software to help secure naval ports where 20-km sensor connectivity range and 10-year battery life is required. These are just a few examples of the emerging use cases where LoRa's low power, long distance, and flexibility demonstrate the value of LoRa technology in enabling a smarter, more connected, and sustainable planet.
In Q4 fiscal year 2021, we also experienced record quarterly demand for our proximity sensing platforms, led by strength from our Asian smartphone customers. Global RF regulations are increasing the proximity sensing requirements on smartphone manufacturers that wish to compete on a global stage. We expect our proximity sensing business to benefit from these enhanced requirements and recent design win activity in new 5G smartphones and wearable devices, where there are an increasing number of high-performance radios being used, indicate that our proximity sensing business will continue to grow nicely. For Q1 of fiscal year 2022, we expect net revenues from our wireless and sensing product group to increase and deliver another record quarter, led by growth from our LoRa business. Moving on to new products and design wins. In Q4 of fiscal year 2021, we released 18 new products and achieved 3,080 new design wins.
Now let me comment briefly on our fiscal year 2021 performance. In fiscal year 2021, net revenues increased 9% to $595.1 million, driven by strength from all of our product groups. In FY 2021, we had 56 new product releases and achieved a new design win record of 11,271 new design wins. In FY 2021, our Signal Integrity Product Group grew 15% over the prior year as infrastructure spending increased. Our SIP product group achieved record bookings and had record 100G revenues, record 5G base station revenues, and record 10G PON revenues. We expect these businesses, along with our PAM4 and Pro AV businesses, to all achieve records in FY 2022 and contribute to strong growth in our Signal Integrity Product Group in fiscal year 2022.
In FY 2021, our Protection Product Group grew 3% over the prior year as the high-end consumer market strengthened and our diversification strategy began to yield results. We expect our protection business to achieve double-digit growth in FY 2022 as our diversification efforts continue to bear fruit in both the consumer market and the broader industrial, automotive, and communications markets. In FY 2021, our Wireless and Sensing Products Group grew 6% over the prior year. Despite the slow start to the year due to COVID, our LoRa-enabled revenue grew 19% to approximately $88 million in FY 2021. In FY 2021, our LoRa business met or exceeded most of the metrics we targeted at the beginning of the year. These metrics included the number of countries with public LoRa networks in FY 2021 grew to 100 countries from 91 at the end of FY 2020.
As LoRa is well established in most regions of the world, we will no longer report on this specific metric. The number of public or private LoRa network operators grew to 150 at the end of FY 2021 from 133 in FY 2020, and we expect 165 LoRa network operators by the end of FY 2022. Number of LoRa gateways deployed more than doubled from 642,000 gateways in FY 2020 to over 1.3 million gateways at the end of FY 2021. We expect the number of LoRa gateways deployed to increase to over 2 million by the end of FY 2022. The cumulative number of LoRa end nodes deployed increased to 178 million at the end of FY 2021 from 135 million at the end of FY 2020. We expect this number to exceed 235 million cumulative end nodes by the end of FY 2022.
The LoRa opportunity pipeline, which includes both opportunities and leads, ended FY 2021 at approximately $700 million. We anticipate that on average, 40%-50% of the opportunities currently in the pipeline will convert to deployments over a 24-month timeline. Our opportunity pipeline is geographically well-balanced, with use cases primarily in smart utilities, smart logistics and asset tracking, smart home, and smart cities. At the end of FY 2022, we are anticipating our total opportunity pipeline should exceed $850 million. In FY 2021, our LoRa business achieved several major accomplishments. These include our partnership with Amazon on several projects, including the Amazon Sidewalk network, designed for smart home, community, and consumer applications, providing low power, broad coverage for indoor and neighborhood area IoT devices.
We expect revenues from our Amazon activities to start to ramp this fiscal year. Our LoRa global platform that uses a 2.4 GHz version of LoRa has been adopted in a number of global use cases that require higher bandwidth or connectivity in areas where LoRaWAN networks may not be present. Our LoRa Edge platform enabled our first device to cloud platform and associated cloud services. In FY 2021, we launched our first LoRa Cloud Services offering device provisioning, device management, and geolocation services. We have closed on our first cloud services agreements and expect initial cloud services revenues this fiscal year. We anticipate signing up over 20 cloud services agreements with customers by the end of fiscal year 2022, as we fine-tune our capability and service offering. This is a new metric that we will report on quarterly. These accomplishments demonstrate the evolving maturity and acceptance of LoRa.
With the growing momentum and along with the continued influence of the LoRa Alliance, we expect to continue to drive LoRa to become the de facto standard for the global LPWAN market in what we expect to be a multi-billion unit industry in the next five years. For FY 2022, we are expecting positive momentum from our LoRa business and anticipate a 40% CAGR for our LoRa-enabled business over the next five years. Let me discuss our outlook for the first quarter of fiscal year 2022. Following a record bookings Q4 and a record bookings year, we entered Q1 with record backlog. We are currently estimating Q1 net revenues to be between $164 million-$172 million. To attain the midpoint of our guidance range, or approximately $168 million, we needed net turns orders of approximately 16% at the beginning of Q1.
We expect our Q1 non-GAAP earnings to be between $0.49 and $0.55 per diluted share. I will now hand the call back to the operator, and Sandy, Emeka, and I will be happy to answer any questions. Operator?
Thank you. We will now be conducting a question and answer session. If you would like to ask a question, please press star one on your telephone keypad. The confirmation tone will indicate that your line is in the question queue. You may press star two if you would like to remove your question from the queue. For participants using speaker equipment, it may be necessary to pick up your handset before pressing the star key. In the interest of time, we ask the participants to limit themselves to one question and one follow-up. One moment, please, while we poll for questions.
Yes, thank you, and congratulations on the record results. Mohan, you talked about targeting 20 service agreements by the end of fiscal 2022 for LoRa. Could you elaborate a little bit more on the size of those? Are these kind of like million-dollar agreements? Just trying to understand how quickly the services revenue can ramp. I know eventually, obviously your target is $100 million, but just wanted to understand, for fiscal 2022, how much it's ramping.
Yeah, the thinking, Tore, is that the agreements will really be focused on connecting devices. Obviously if there's a very high volume of devices and usage of those devices accessing the cloud services, then the revenues will go up. It depends on use case, it depends on number of devices. Each one is kind of individual on its own, that's the way the thinking is. The revenues will be generated by the number of times the algorithms are accessed and the number of devices, et cetera, things like that. Obviously FY 2022 for us, this is almost a trial year to make sure we fine-tune the system. I mentioned the three areas we're starting off with, device provisioning, which is about connectivity to the network and the cloud.
Device management, which is about monitoring the device itself and making sure the battery, telling you what the level of the battery is and things like that. Then geolocation, which is about locating the device and tracing it, and things like that. We have to demonstrate the value, but as we demonstrate the value, I think as customers recognize the value of each of those aspects of the service, then they'll be quite happy to pay for it. That's the thinking, and we'll see how it plays out.
Yeah, thank you for that. As my follow-up, you sound pretty confident that gross margin could expand this year, obviously driven by mix. Does that mean that your visibility in your infrastructure markets, including 5G and data center, is pretty decent right now? I know those markets have been a bit softer as of late, but it sounds like you have that pretty good visibility there now.
Yeah, Tore, this is Emeka. Yeah, I think we feel very good about what is happening in the optical infrastructure space. We continue to see a whole lot of design wins with some of our new product platforms. The expectation on our side is that we have a lot of good things going on the gross margin side. A lot of the new products are driving top-line revenue. Speaking on the gross margin, the one thing that is still out there that we're trying to really assess is what is the impact of cost increases within the supply chain. Although our feeling is that any negative impact we get from that should be m itigated by not giving us much pricing reductions, or actually, in some cases, going back and asking for higher prices from our customers.
To your point, definitely, like I said before, I think it was last quarter, I'm still anticipating seeing gross margin expansion anywhere from 50 - 100 basis points. We feel pretty good about that based on the visibility that we have at this time.
Very good. Congrats again.
Thank you. Our next question comes from Tristan Gerra with Baird. Please proceed with your question.
Hi, good afternoon. Just following up on the same topic. Any concerns about availability of any component or in terms of wafers for this year? Also, have you implemented any type of non-cancelable order policies with your customers?
Tristan, I think on the first part of the question, you can see probably since the second half of last year, we've been building more internal inventory, and one of the reasons for that is the increasing lead times in supply chain. We don't anticipate any major issues, at least in the first half of the year. We think we're going to be good for most of the year. Obviously, we're looking at it daily, and it depends on demand. We have a couple of constraints around the business in terms of supply, but fairly small, modest in nature, I would say, less than a few million dollars. I think here and there. We're just wait and see where the upside is.
As I said, we think we have it covered with our demand management and inventory management and the way we're managing the business. I think we're okay. As Emeka pointed out, obviously we have some supply constraints, and in those cases, we are going out and looking at whether when we get increases in the supply side, on the cost side, we are going out and deliberately looking specifically at where we can also offset that with raising prices. In some cases, I think it's also being more disciplined about how we work with our partners. In general, at the moment, we don't have to do anything. I think the first half is going to be fine.
I think it's really going to be a question of how the second half plays out, and if demand continues to be extremely strong and improves, and the markets continue to improve, then we may have to do some of those things. I think at this point, we're okay.
Great. Thank you.
Thank you. Our next question comes from Harsh Kumar with Piper Sandler. Please proceed with your question.
Yeah. Hey, guys. First of all, congratulations on some very good numbers and some very good guidance despite all the challenges in the market. We do appreciate that as investors. I wanted to ask you, Mohan, of all the things that you see positive that are going on with your company, what are some of the things that you are the most excited about or you feel that'll grow the fastest for you? I have a follow-up.
Well, this year, I think, is going to be the year where LoRa really moves into the mainstream. I've said that before. There will be catalysts, and I think we are starting to see that. Obviously, the Amazon Sidewalk announcement was exciting. The Amazon AWS IoT Core announcement was exciting, and the cloud services, the first time we've really gone out there with cloud services as a capability, and we're going to test and check that out and see. We're very excited about that. Obviously, we'll see how the results play out over the next few years, that's obviously exciting. All of our businesses in the infrastructure side, on the Signal Integrity Products side, are doing extremely well. Obviously, it's largely to do with the world moving to more higher bandwidth across different segments of the market.
Because we play in all areas, data center, base stations, and on the access side with PON, we can see that there's demand in all areas, and one feeds the other. If you have core bandwidth increase, you need base station bandwidth increase. If you have base station bandwidth increase, you need access bandwidth increase. We're seeing that definitely playing out. I think the other thing that's exciting about that is that it's becoming more global. For a large part of our last five years, if you look at it, I mean, a lot of the growth has come from China, and what we're seeing now is a lot more growth in other regions. Very excited by Tri-Edge. Got great momentum with that, and so we'll see how that plays out.
We're very excited by the work that's going on with customers and the feedback, and we started to get very good orders in that area. That's very exciting. I think the protection business, we made the decision to diversify a few years ago. That's starting to play out nicely for us, and I think that could be extremely positive for us as well. Yeah, lots of areas, Harsh. It's tough for me to pick out one, but I think if you have to pick out one, it would still be LoRa.
Okay, awesome. Thank you, Mohan. Thanks for mentioning Tri-Edge. I was going to ask about that. I'll ask you now about what kind of interest are you seeing regarding your cloud services from customers? As you talk to the folks out there that are going to buy these services, are they excited, or is it just more of a push or show me the concept kind of thing at this point?
It's a little bit of both. I think the initial "Show me." Once they see what we have, I think there's a lot of excitement. I think it's a very unique platform, right? We're the only real guy out there providing device-to-cloud services that offer this type of capability. We can offer very good security in terms of device provisioning, joining network, obviously, because we are in both the end devices and in the gateways, and obviously have worked with the cloud guys. On the device management side, that's also a very unique capability, being able to update the device itself over the air and software. Geolocation, obviously another unique capability for us with what we have with Wi-Fi sniffing and GPS sniffing, essentially being able to allow the device to be tracked indoors and outdoors, is a very nice feature as well.
Lots of nice things. It's embryonic. It's very new. The opportunity's clearly there. The market is huge. Now I think if we execute, we should do very well.
Thank you, Mohan.
Thank you. Our next question comes from Gary Mobley with Wells Fargo Securities. Please proceed with your question.
Hey, guys. Let me extend my congratulations on a strong finish to the year. We have seen and heard out there in the marketplace of manufacturing constraints for automobiles, as there's a shortage of automotive semiconductors. We heard just yesterday, Samsung talking about smartphone supply chain constraints. My question to you is, to what extent have you factored into your guidance any supply chain constraints unrelated to your specific products?
Unrelated to our specific products is tricky because we don't really know until we hear about it, right, Gary? I would say, you can tell from our turns number required, obviously, we're guiding to a number we feel comfortable with based on how much turns we need. The question really is whether our customers change their demand outlook and then reduce the need for the devices. I doubt that's gonna happen. If anything, I think it'll go the other way, which is, as lead times continue to extend out, they'll want more material and need more material if they're going to continue to be successful. I don't think it changes much from our perspective.
Obviously, there could be a surprise if some customers come back and cancel phones and things like that. The likelihood is it's just a temporary blip. The next quarter will probably be even stronger if they choose to grow their businesses, right?
Okay. Appreciate it, Mohan. To follow- up, I had a couple of quick housekeeping questions. Could you share with us perhaps how much the extra week in the quarter impacted the sales? As well, could you give us an update on where your distributor inventory stand in terms of days or weeks?
Gary, with regards to the impact of the 14th week on sales. It's really kind of hard for us to estimate that, right? I think what most people have typically done is just look at it on a linear basis, right? With regards to distribution, we don't announce the days publicly, but I can tell you that we're very pleased with where the distribution inventory is, and it's probably a little bit on the lower side if I were to add some color to that.
All right. Thanks, Emeka. Thanks, everybody.
Thank you. Our next question comes from Quinn Bolton with Needham. Please proceed with your question.
Hey, guys. I'll offer my congratulations as well. I apologize that my call dropped during the Q&A, so I apologize if somebody else asked a question. Mohan, you talked about a strong outlook for the LoRa business in fiscal 2022 really starting to hit the mainstream and a 40% longer term five-year CAGR. Wondering if there's any reason to think that the growth in fiscal 2022 for LoRa would be wildly off that 40% year-on-year rates implied by the longer term CAGR you're looking at.
Nothing I can think of, Quinn, other than macro events. This last year, pandemic, something like that occurring, just all bets are off, right? On what type of things are going on. The pipeline is good. The activity is good. A number of new big initiatives, like the Amazon Initiative I mentioned. We got more in the pipeline on those that will be announced soon. I think cloud services, as I mentioned. We just got great momentum. One of the things about LoRa and IoT, and specifically the LPWAN market, it's a market that's being created. A lot of the use cases are around climate initiatives, pollution initiatives, green initiatives, energy savings initiatives, and there's just great momentum. My own sense is that if anything, the momentum will be better. At this point in time, we're just monitoring it case by case.
We look at all the use cases, we look at all the proof of concepts are in place and how we can move those to revenue. Yeah, I think there's a lot of initiatives. Obviously, the Amazon Sidewalk initiative, as an example of that. Once it starts to really get out there, and I think it's more the second half of this fiscal year, but as it starts to ramp, that could really ramp very nicely, very quickly, or it may not. We'll have to wait and see. We're confident about it.
Just a quick clarification, Mohan, on the Amazon Sidewalk. When you're talking about that second half of 2021 ramp, is that more on the gateways or is that on the end node side?
What we know, and obviously, I can't talk about it in too much detail, but what we do know is that work is going on on both ends, both devices and gateways. From a use case standpoint, you really need the gateways out there first and then that will drive more end nodes and more sensors. Once the gateways are in place, of course, you can then add infinite amount of sensors. I think, once they're in place and you have an install base of gateways out there, I think the next 5- 10 years will be very interesting to see how many sensors are actually connected.
Great. The second question I have is just on the protection business. I think you said that outlook for growth in fiscal 2022 was 10% or better. I might have missed it, but did you give an outlook for Signal Integrity? It sounds like base station, PON, data center, all going to be pretty good growth here. Just wondering if you had a kind of a fiscal year 2022 target for the Signal Integrity business.
I expect it to have another record year, Quinn, and grow double digits again. Very strong. All areas of the business, I expect data center, base station, and PONs will do very well. As I mentioned, the PAM4 side, the Tri-Edge is doing very well, I expect that to grow very nicely in FY 2022. Some of the segments that struggled in FY 2021, particularly video, broadcast, Pro AV stuff, really struggled in FY 2021 through COVID. I think some of that's going to come back quite nicely in FY 2022. We'll see. It may be second half loaded again as live events come back on and as more people start to get out there to sports bars and things like that. I do expect a ramp-up of Pro AV as well.
I'll be rooting for the video broadcast business then. Thanks, Mohan.
Thank you.
Thank you. Our next question comes from Karl Ackerman with Cowen. Please proceed with your question.
Yep. Good afternoon, gentlemen. Appreciate you letting me ask a question, two, if I may. First, some 5G networking supply chain players have noted a pause in China infrastructure projects until tenders are granted. Given your unique position within the supply chain, I guess, what level of activity are you seeing in China infrastructure spending today? I guess, also in the context of 10G PON order rates for the April quarter.
Well, we see strength in both areas, 10G PON and 5G base stations. As you know, comm is sometimes lumpy and one quarter here, sometimes you wait. In general, everything's up and to the right, and that's not a surprise. Infrastructure across the globe is increasing. 5G base stations are increasing. 4G also is increasing. PON is doing nicely, and as I mentioned, 10G PON, specifically because of the bandwidth expansion needs, is increasing quite nicely. The other thing is, it's not just China, I think that's an important takeaway is that, we are starting to see a lot more activity in both 5G and PON in North America and Europe and other regions of the world, which is also quite good, very positive. Remember, with both 5G and PON, we have more content than we had with 4G.
With 5G, obviously, we have now CDRs as well as PMD function. Also with 5G, there's typically more fronthaul modules . You have the expansion on the geographical side. On the PON side, not only do we have 2.5G and 10G PON, but in 10G PON we also have the OLT side, so ONU and OLT side, so kind of the CPE and central office side, if you like, and that's also giving us more content. In both these segments of the market, we're doing extremely well. I would say that both markets are also doing quite well, though.
Got it. No, appreciate that, Mohan. For my follow-up, you spoke about how protection business can grow double digits this year. How does automotive play into that outlook, and how should we think about the incremental revenues here and I guess the margin profile for those as you look to expand into this area? Thank you.
Protection is doing very well in automotive. It does take longer, though. This is all fairly new design wins in automotive, and those take some time. They kind of have more of an industrial growth rate, I think. Yeah, I do expect to do well. Any protection that goes into automotive or into IoT or into communications infrastructure or into broader industrial, will be at either our corporate average or much higher, actually. In general, it's the consumer protection business that's the lower margin for us. I think, as Emeka pointed out, if we get the right mix in both our different businesses, but across the company, that should be accretive to gross margins.
Thank you. Our next question comes from Rick Schafer with Oppenheimer. Please proceed with your question.
Hi, this is Andy Hummel on for Rick. Thanks for taking my question. The first one, just with LoRa and some of the Amazon wins that you announced, but more specifically on the AWS IoT side, can you just talk a little bit more about the opportunity with that platform? What are some of the factors that Amazon has that helps you accelerate LoRa adoption? More broadly, if you can just remind us what your revenue opportunity is with the Amazon partnership.
Yeah. AWS IoT Core is really an important initiative. It's taken several years, I think, to come up with and develop and create. Essentially it creates a plug-and-play experience for enterprise solution providers that enables them essentially to connect their IoT sensors directly to the Amazon cloud. Why that's important is essentially as a time to market thing and also a competence thing, because AWS already has software developed for applications, has different unique kind of vertical application software that it can be applied to different segments. Not only the connectivity enablement, which is easier and faster, but then also the ability to provide a kind of end-to-end solution quicker is also important. I would say that's the key thing. For enterprise, it's really an enterprise play, different than Sidewalk, which is more of a kind of a smart home consumer play.
That gateway connectivity directly to the cloud is really significant for large enterprises. We do expect that to be part of our $100 million in five years with Amazon is tied to Sidewalk and some of it is tied to AWS IoT Core, but I think that's kind of the goal.
Okay, great. Thanks. As a follow-up, just on the 10G PON market, do you guys have a sense for where customers are at in the upgrade cycle? Is there a way to quantify, I guess, what percentage of customers that might end up upgrading at some point have already upgraded to 10G?
About 50% of our revenues that are coming in quarterly now are for 10G. That's a very rapid increase. I wouldn't have expected that. We knew 10G was going to ramp up, but that tells me that the market's moving to higher bandwidth PON quite quickly. We're expecting that to continue to grow that way. Yeah, it's moving fast. If you think about it, 10G is a natural handoff for 5G. It's also a natural connectivity point for HDTV, things like that. It's really a nice kind of data point. 10G typically is a good handoff point for high-speed data. I think 10G PON has an option to do very well.
We look at it, if you've got a greenfield site, it's actually in China, but I think it also applies to other regions of the world, where you don't have optical cable, but you're going to lay out optical cable, you'd go with the higher bandwidth, optical connectivity, right? That's why you'll go with 10G PON or above even. We have customers who are looking at higher bandwidths as well, which again, will help Semtech.
Okay, great. Thanks. Appreciate it. Congrats on the quarter.
Thank you. Our next question comes from Craig Ellis with B. Riley Securities. Please proceed with your question.
Yeah. Thanks for taking the question and congratulations on the results. Mohan, I wanted to start with LoRa, but before I ask the question, thanks for keeping the dashboard fresh and the metrics relevant to the things that are evolving in the business. The question on LoRa, though, is if we look back a year ago, I think it was a priority to really increase the mix of design win and engagement activity in U.S. and Europe, and the team clearly did that and did that well. As you look ahead to 2022, are there any areas of geographic emphasis as you look at pursuing some of the metrics that you talked about in this year's LoRa dashboard?
I think we still have to execute on that, Craig. I would say it's moved now, a lot of the opportunities are outside China. I don't think that we necessarily are changing our strategy in China. Our momentum in China is still very good. It's more a question of let's make sure we have momentum in other regions of the world. Clearly North America now, with Amazon and some of the things that are going on in the enterprise space in North America is extremely good, and in Europe as well. I think it's more of the same. We just want to keep doing that and executing on that. Now, as I mentioned, really LoRa is quite well adopted around the world globally. It's really acknowledged as a great technology for LPWAN.
I think our focus now is on executing on the proof of concepts and making sure there's end-to-end solutions, there's enough sensors, there's enough gateways, there's high-quality software out there's cloud connectivity, those type of things. Really focusing in now on the use cases, make sure that the customers themselves who are implementing those use cases are not having any challenges with the use of LoRa from an end-to-end solution standpoint. Therein lies the opportunity with LoRa Cloud, I think, and with some of the things we're doing with Amazon on the AWS IoT Core, for example.
Got it. The follow-up, Emeka, is for you. In your prepared remarks, you mentioned rising input costs and the potential to make some pricing moves. I just want to dig in a little bit further on what was possible. For example, I would expect in some parts of the business, it may not be possible to raise prices due to your relationship with existing tier one customers. In other parts of the business, it may be more feasible. Can you just provide some further color on what the company might be able to do and when, in fact, the company might be able to make some moves if it chose to act in that direction? Thank you.
Thanks, Craig. I think we already seen, like Mohan did mention, we already seeing some instances where we're getting indications of price increases from the supply chain. We're assessing that. It's pretty much going to be across the board where we continue to look at which product lines, which areas are we seeing the impact of these increases. Then we'll have to figure out whether the strategy is just going to be, as you come into every year, you plan for a certain amount of ASP reductions. Maybe, the answer is going to be, "Okay, we're not going to give those planned ASP reductions." In some cases, if the increases on the supply chain is pretty significant, then we'll have to expect our customers to help us share some of those burdens.
I'm not sure that I can come out now and tell you exactly where we are seeing things. Our sense, though, is that we should be able to find opportunities to offset the impact of cost increases that we get.
One thing to remember, Craig, as I mentioned earlier, is that, we have done a really fantastic job, in my view, of building more inventory in anticipation of some of these issues. I think, at least for the first half, I think we feel pretty good about where we are from a supply standpoint. The question really is in the second half. If demand increases and we need to go to our suppliers and get more material, then it's going to come at a higher price, right? For those, we may have to go to our customers and request higher pricing.
Well, certainly you wouldn't be the first doing so there. Guys, thanks very much and good luck.
Thank you. Our next question comes from Chris Rolland with Susquehanna. Please proceed with your question.
Hey, guys. This one will be for Mohan. I recently ordered a Helium hotspot. I am back ordered on that. If you look at the token value market cap implied by the network, we're in the hundreds of millions now, which would imply this would be a real thing. I was wondering, Mohan, if you could talk about this. Do you think this could be a real thing? Is this something that maybe you thought Comcast was going to be? Can you talk about where we are now and how you're viewing this whole network?
That's a really interesting question, Chris. I would say that that was our vision and dream with Comcast. For whatever reason, they decided not to go down and continue to execute on that. They're still involved, but not with the ambition that we thought they initially had. We do think that that's the same kind of concept, which is Amazon Sidewalk has and others that are in the pipeline. Helium's approach is very interesting and very unique and very creative, which obviously fits well with LoRa and all the things that are going on. Yeah, I think it could work. To some extent with some of these networking approaches, it's the beauty of LoRa, which is it's very flexible, can have very low cost, very secure networks that connect together, and it just changes the world of networking to some extent.
I think that's the ambition, right? So take it away from the big guys and give it to the small guys and see what happens. We'll see. It's early, and I think with Helium obviously being a startup they have to execute. We see this in several countries in the world going on. It's not just in the U.S. As I say, I think definitely the momentum is there. We'll see how it plays out. The use cases are the key in my view. As more and more use cases become available and make the network itself very valuable, then I think it could work for sure.
Understood. My second question is around China, both on the handset side and the optical side. I think you said China handset was good. Do you have any viewpoint on China inventories and how much you were helped by inventories that may have been built as Huawei has been struggling here? The other guys have been said to have been building inventory. Secondly, on the 5G infra side, I think you mentioned some optical strength. Is that where it came from? Was it China optical on 5G?
Well, I'll take that one first. The 5G strength today is mostly China, but I think we are starting to see new opportunities now emerge from other regions of the world, which is, as I said, very encouraging. It's well understood, I think, around the world, that some of the North American and European companies, Nokia, Samsung, Ericsson, Cisco, are all engaged in trying to build 5G systems and equipment. We see definitely a good momentum there more globally. On the smartphone question, on mobile question, for sure, China has ramped up, and specifically non-Huawei smartphone manufacturers have ramped up their demand and are looking to get more material. We are seeing that strength. I would say it's also North America, the strength is there. Korea has been slightly not so strong. I do think that that may come back in Q1 and beyond.
Certainly for Q4, China was strong, and probably will be for the first half of this year. I don't know how much of that is supply chain driven. I don't think it is. I think we sort of started to see that well in advance. I think it's more in anticipation of maybe winning some of Huawei's business. At the end of the day, we look across all of our customers and are looking at carefully at what is demand and what's being consumed and how much material is out there in the channel, and paying a lot of attention to that.
Thanks, guys.
Thank you. Our next question comes from Cody Acree with Loop Capital. Please proceed with your question.
Thank you guys for taking my question. If we can go back maybe toward the beginning, I'm just trying to get a better sense of the velocity of your bookings level as we push here through the first part of the year, just on a linearity basis. What is that? Is there a correlation between that bookings uptick and the expanded lead times?
I would say that the demand came first, Cody. We definitely started to see bookings, very strong bookings, in October, November, December. Very, very strong. Chinese New Year softened a little bit. Bookings have been very strong since then. Lead times have been gradually increasing. Supply lead times have been gradually increasing. Customers obviously want to give you more visibility as they get concerned about supply constraints. I think it's a healthy position for someone like us. We've built inventory. We have enough material to support the customers. It's just a question now of making sure that the materials we ship out are being consumed effectively. I think that's what, as I said, we're keeping a close eye on. That's kind of the way we think about it.
Mohan, I guess, given your position, how much visibility do you have? Do you feel comfortable with having on the possibility of double ordering or just inventory restocking efforts? We all know how this ends, what visibility do you have? Maybe why the 16% turns guidance visibility is so high? Why not a higher guidance if you're that much booked for the quarter?
We do have very good visibility, actually, and that's the good thing. As I said, that's not a surprise. The turns number and the reason for the low percentage turns is mostly because of that consumption question, as I answered, is that, while customers are asking for more, we want to be cautious about making sure that there's no excess channel inventory. We pay a lot of attention to that. As Emeka said, it's kind of the low end, and we'd like to keep it there. We are making sure that whatever we ship out is being consumed effectively, and it's not double ordered and things like that. We're taking specific steps on that front, and that's the reason why our turns numbers is what it is.
Great. Thank you, guys.
Thank you. Our next question comes from Tore Svanberg with Stifel. Please proceed with your question.
Yes. Thank you. I just had a few follow-up housekeeping ones. Mohan, you talked about the LoRa pipeline being $700 million. I believe in the past, you've talked about the funnel and leads to the funnel. Is that $700 million now basically just adding those two up?
Yes. Opportunities and leads, Tore. I would say that this last year, in FY 2021, normally a lot of the raw leads come from shows, conferences, events, and things like that. Of course, we went, in Q1, into a period where nothing was happening. I think that's going to change this next fiscal year when things start to get back to normal in terms of some conferences being open, shows starting to open up a little bit, and people traveling a little bit more. We'll start to see those leads expand. Yeah, to answer your question, it's a combination of both opportunities that are in the pipeline that are running proof of concepts and leads.
Got it. I just had a question on sort of the math of the number of the gateways and the end nodes versus your revenue. I think end nodes grew about 30%, gateways, I think, doubled YoY. Your revenues grew 20%. How should I just think about the math there? Of course, I'm not looking at perfect science here.
Yeah.
Any-
The way to think about it, Tore, remember, gateways is creation of a network, right? They're creating the networks first. They put it in gateways, whether that's a private network or a public network. The end nodes are tied to actual sensors being connected to those gateways. Remember, the timing of an end node, when we ship a device out, the device typically will go to a distributor. The distributor will then ship it to a customer. The customer will then put that, for example, that device, we just sell the radio component. They'll put it into a system, build the whole sensor node, and then it gets connected to the gateway. There is different timing components here. The reason why I share these metrics, obviously, the gateways are important because it tells you about the capacity that's out there to support LoRa.
With the current capacity of 1.3 million gateways, that can support about 5 billion sensors there. There's plenty of availability of networks to support sensors. The cumulative end nodes is important because it tells you exactly how many nodes are now connected to the gateways. In terms of our revenue, it's when we ship devices to our customers, right?
Right. No, that's very helpful. Thank you so much.
Thank you. There are no further questions at this time. I would like to turn the call back over to Mohan for any closing comments.
In closing, we were pleased with our strong Q4 and fiscal year 2021 results. Despite the impact of the pandemic, our multi-sourcing initiatives, our investment in IT, operations, and sales infrastructure limited the impact of COVID on our business operations. We also benefited from the strengthening of several secular themes driving our key growth engines targeted at the data center, Internet of Things, and mobile device segments. We remain committed to considering the impact of environmental, social, and governance factors in our decision-making processes. Given our diverse product offering, balanced end market approach, and strong customer relationships, we expect to see growth and a strong financial performance in fiscal year 2022. We appreciate your continued support of Semtech and look forward to updating you all next quarter. Thank you.
This concludes today's conference. You may disconnect your lines at this time. Thank you for your participation. Have a wonderful evening.