What to secure now, and which alternates still hold stock
Microcontrollers and microprocessors are one of the electronic component categories that are experiencing the most supply pressure this month.
Supplyframe Commodity IQ projects the MCU and MPU Lead Time Index will rise 6.3% sequentially in Q2 to a score of 130.5. At-volume lead times are also set to experience a significant increase, with the share of delivery lags in the 26 to 35 week band jumping to 48.9%, up from 18.1% in Q1.
At the same time the MCU and MPU Price Index is projected to climb 10.7% in Q2 to 215.2, more than twice the 2020 baseline, then a further 4.6% in Q3 to 225.0. Supplyframe Commodity IQ indicates a 5% STMicroelectronics MCU price increase effective April 26.
Live Findchips results confirm the squeeze is real but uneven. New orders for the popular STM32F103C8T6 carry 30 to 31 week lead times at every major authorized distributor, yet immediate reel stock is still on the shelf at DigiKey and Avnet. NXP i.MX 8M Mini processors are the worst hit, at 30 weeks from NXP direct and 52 to 54 weeks at DigiKey, Avnet, and EBV.
The bright spots are clear too: the Microchip ATSAMD21G18A-AU ships in 4 to 11 weeks with healthy stock, and the GigaDevice GD32F103C8T6 offers a pin compatible bridge near 1.10 dollars.
Top three design side movers this month:
- STM32F103C8T6 design lookups rose 46.0% month over month (rank 4),
- ESP32-S3-WROOM-1-N16R8 rose 94.6% year over year (rank 12)
- AMS1117-3.3 regulator that pairs with these MCUs held rank 5 on the design ranking.
Top three sourcing side signals:
- Open market MCU and processor purchase activity cooled 8.1% month over month as buyers appear to be delaying discretionary catalog purchases amid tariff and pricing uncertainty
- FTDI USB bridge purchases surged (FT230XS-R up 833% year over year)
- Infineon gate driver buys spiked. The takeaway is that buyers are protecting active lines while delaying discretionary spend, exactly the behavior a lead time spike rewards.
What Buyers Should do Now
- Secure on hand authorized stock for constrained MCUs before Q3, then qualify alternates in parallel. Start with the part feeling the most design pressure: Check STM32F103C8T6 availability across distributors.
- Pull immediate authorized reel stock for the STM32F103C8T6 while new orders sit at 30 to 31 weeks, and place backlog now so you hold a queue position into Q3. View real time STM32F103C8T6 distributor stock.
- Treat NXP i.MX 8M Mini designs as the highest risk. With 30 to 54 week lead times, secure coverage for the full build horizon or begin a redesign review now. Confirm MIMX8MM6CVTKZAA stock and lead times.
- Shift discretionary new designs toward parts that still ship fast. The Microchip ATSAMD21G18A-AU clears in 4 to 11 weeks with deep stock. Compare ATSAMD21G18A-AU pricing and stock now.
5 MCU & MPU Parts to Watch (And What to do About Them)
1. STM32F103C8T6
The STM32F103C8T6 is a 32 bit Arm Cortex M3 MCU at 72 MHz with 64 KB flash in an LQFP48 package.
Findchips lists 12 authorized and 8 independent sources. Every major authorized distributor now quotes 30 to 31 week lead times on new orders, yet on hand reel stock remains: DigiKey shows about 4,100 pieces in tape and reel, Avnet shows roughly 41,800, and Future Electronics about 1,700. Authorized volume pricing runs near $3.14 to $3.75, while low quantity cuts reach $6 to $8.
Lead time, stock, and price figures are read directly from live Findchips authorized listings on June 18, 2026. Independent listings near $0.94 exist but are unverified open market offers. Treat them as bridge supply only and confirm date codes before committing.
Engineering Considerations
“Is the STM32F103C8T6 still safe to design into a new product in 2026?”
It is safe for existing STM32F1 based designs, but new designs should include a qualified alternate or migration path. The silicon is mature and well supported, but a 30 to 31 week replenishment lead time means a single source design is exposed. For new work, design the footprint so it also accepts the GD32F103C8T6.
Our recommendation: Lock the LQFP48 footprint to a dual source MCU and verify the primary is live before layout: Confirm STM32F103C8T6 datasheet and authorized sources.
“What is the best pin compatible replacement for STM32F103C8T6 right now?”
The GigaDevice GD32F103C8T6. It shares the LQFP48 pinout and is largely register- and tool-compatible, and runs faster at 108 MHz.
Design recommendation: Qualify it as a parallel source rather than a sole replacement. Pull the alternate side by side with the primary to confirm fit and stock: Compare GD32F103C8T6 stock and pricing.
Buyer Considerations
“Who has STM32F103C8T6 in stock right now and what is the lead time?”
Immediate authorized stock is available from DigiKey and Avnet today, but anything beyond that on hand quantity is quoted at 30 to 31 weeks. Buy the on shelf reel positions first, then place a backlog order to hold a Q3 delivery slot before the forecast lead time step.
Procurement action: Grab on-hand reels and place backlog orders in the same session: Buy in stock STM32F103C8T6 and check lead times.
“What is the cheapest authorized distributor for STM32F103C8T6 at volume?”
At reel volume, authorized pricing clusters near $3.14 to $3.18 from Avnet and about $3.75 from DigiKey at the 2,400 break. The much lower independent offers near $0.94 are not authorized and should be reserved for emergency bridge buys with date code verification.
Sourcing recommendation: Sort authorized volume breaks before you commit a PO: Compare authorized STM32F103C8T6 volume pricing.
2. NXP MIMX8MM6CVTKZAA
The MIMX8MM6CVTKZAA is an i.MX 8M Mini applications processor with quad Arm Cortex A53 plus Cortex M4F in a 486 ball LFBGA.
Findchips shows nine authorized and five independent sources, and the June 18 Findchips snapshot shows 30 weeks from NXP direct and 52 to 54 weeks at select distributors including DigiKey, Avnet, and EBV. Stock pockets do exist: Avnet shows about 4,675 pieces and EBV about 45,000, with pricing from roughly 18 to 34 dollars depending on channel and quantity.
This corroborates the Commodity IQ note that some i.MX7 and i.MX8 devices have stretched to around 30 weeks on backend substrate allocation.
Engineering Considerations
“Should I redesign around the MIMX8MM6CVTKZAA or stick with it?”
If your production ramp lands inside the next 12 months and you do not already hold allocation, start a redesign review now. A 52 to 54 week catalog lead time will not clear a new program. If your ramp is further out or you can secure direct allocation at 30 weeks, staying on the part is defensible because the in-family migration cost is high.
Engineer takeaway: Confirm the live lead time spread before deciding to hold or pivot: Check MIMX8MM6CVTKZAA lead times by distributor.
Buyer Considerations
“Where can I actually get MIMX8MM6CVTKZAA and how much will it cost?”
Authorized stock is thin but real. Avnet and EBV hold the deepest positions, NXP direct quotes 30 weeks with a small on hand pool near 377 pieces. Pull the authorized pockets first and reserve independent stock for gap fill with full traceability.
Supply recommendation: Map every authorized pocket and its price break before you split the order: See all MIMX8MM6CVTKZAA authorized sources and pricing.
3. Microchip ATSAMD21G18A-AU
The ATSAMD21G18A-AU is the low risk MCU to favor for new low power designs this quarter. It is a 32 bit Arm Cortex M0 plus MCU at 48 MHz with 256 KB flash in a TQFP48 package, it is active, broadly stocked, and a lower lifecycle risk choice (Microchip direct lists a projected end of life in 2040), and Findchips shows 11 authorized and 4 independent sources.
Lead times run just 4 weeks at DigiKey and 4 to 11 weeks across the authorized network, with deep stock: DigiKey holds about 5,000 pieces, Microchip direct lists more than 45,000 on hand, and Master Electronics shows roughly 44,000 factory stock.
Engineering Considerations
“Is the ATSAMD21G18A-AU a good choice to design in for 2026?”
Yes, for low power 32-bit designs that do not need the STM32F1 ecosystem. The Cortex M0 plus core, USB, and broad tool support make it a clean fit, lead times are short, and the long projected life that Microchip direct lists into 2040 keeps obsolescence risk low. It is the safest of the featured MCUs to commit to right now.
Design recommendation: Validate the package and stock depth before you spec it in: Open ATSAMD21G18A-AU stock and datasheet on Findchips.
Buyer Considerations
“How fast can I get the ATSAMD21G18A-AU and at what price?”
DigiKey ships in about 4 weeks from roughly 5,000 pieces on hand, Microchip direct quotes 11 weeks against more than 45,000 in stock, and volume pricing starts near $3.07. This is the part to move discretionary demand onto while the STM32 and i.MX lines stay constrained.
Suggested sourcing action: Lock volume pricing while stock is deep: Compare ATSAMD21G18A-AU distributor pricing now.
4. GigaDevice GD32F103C8T6
Qualify the GD32F103C8T6 now as a parallel source for any STM32F103C8T6 design, but do not make it your only source. It shares the LQFP48 pinout and is largely register and toolchain compatible with the STM32F103C8T6, runs faster at 108 MHz, and currently sells near $1.10, well under the constrained STM32 part.
The catch is a narrow authorized network: Findchips shows a single authorized distributor with about 1,100 pieces, plus independent stock near 35,000. Use it to widen supply, not to concentrate it.
Engineering Considerations
“What is the difference between GD32F103C8T6 and STM32F103C8T6?”
Same pinout and broadly the same programming model, with the GD32F103C8T6 running at a higher 108 MHz core clock and using a different internal flash architecture. For many simple firmware projects the migration may be limited, but teams should validate clocking, flash behavior, peripheral timing, USB and CAN behavior, and toolchain assumptions before production.
Engineer takeaway: Pull the alternate to confirm package and stock before you qualify it: View GD32F103C8T6 availability and pricing.
Buyer Considerations
“Is the GD32F103C8T6 a safe second source given a thin authorized network?”
It is a strong cost and availability hedge, but the single authorized listing means you should set a stock alert, buy in planned blocks, and keep traceability tight rather than treating it as an always on tap. Pair it with the STM32F103C8T6 so either part can carry the build.
Procurement recommendation: Set an alert and confirm the current authorized position: Check GD32F103C8T6 authorized and independent stock.
5. Espressif ESP32-S3-WROOM-1-N16R8
If your design needs wireless connectivity and you are weighing a constrained MCU plus a separate radio, the ESP32-S3-WROOM-1-N16R8 is the abundant path. It is an Espressif WiFi and Bluetooth Low Energy module with 16 MB flash and 8 MB PSRAM, its design lookups rose 94.6% year over year (rank 12), and it is widely in stock,
Mouser shows more than 58,000 pieces, DigiKey about 6,000 at an 8 week lead time, and Future Electronics quotes 4 weeks. Authorized volume pricing runs near $3.90 to $4.34. It is not a pin for pin MCU swap, so treat it as an architectural alternative for connected products rather than a footprint replacement.
Source confidence. Stock, lead time, and price points are live Findchips authorized listings from June 18, 2026. The 94.6% design lookup move is from Supplyframe IQ Design Insights for May 2026.
Engineering Considerations
“Why are engineers moving to the ESP32-S3-WROOM-1-N16R8 in 2026?”
Because it folds a 32 bit MCU, WiFi, and Bluetooth Low Energy into one stocked module with generous memory, for designs that can migrate architectures, which removes a separate radio and its own supply risk from the bill of materials. With connected designs rising and discrete MCU lead times stretching, consolidating onto an abundant module lowers both part count and exposure.
Engineering recommendation: Confirm module stock and memory configuration before you architect around it: Open ESP32-S3-WROOM-1-N16R8 stock and specs.
Buyer Considerations
“Who has ESP32-S3-WROOM-1-N16R8 in stock at the shortest lead time?”
Future Electronics quotes the shortest authorized lead at about four weeks, DigiKey holds roughly 6,000 pieces at an eight week lead, and Mouser carries the deepest immediate position at more than 58,000. This is a part you can buy on demand rather than backlog, so route volume to whichever authorized source clears your quantity fastest.
Immediate action: Route the order to the fastest clearing authorized stock: Compare ESP32-S3-WROOM-1-N16R8 stock and lead times.
Commodity IQ Snapshot: MCUs and MPUs
These index values are from the Supplyframe Commodity IQ ASICs/MCUs/MPUs category for May 2026. They quantify the lead time and pricing pressure described above. A higher index reading means more pressure relative to the baseline.
| Metric | Q2 2026 | Q3 2026 | Direction |
|---|---|---|---|
| Lead Time Index (MCUs/MPUs) | 130.5 | rising | Up 6.3 percent sequentially in Q2 |
| At volume lead times in 26 to 35 week band | see Q3 | 48.9 percent | Up from 18.1 percent in Q1 |
| At volume lead times at 25 weeks or fewer | 78.0 percent | 47.1 percent | Falling into Q3 |
| Price Index (MCUs/MPUs) | 215.2 | 225.0 | Up 10.7 percent Q2, then 4.6 percent Q3 |
| Price Index vs 2020 baseline | over 2x | over 2x | Elevated and firm |
Commodity IQ Insights bullets for the category, May 2026: AI and automotive demand is driving rising MCU and MPU sales and falling availability; Intel reports demand running ahead of supply across MPU lines; Microchip notes recovering bookings while supply tightens on substrate and foundry constraints; contract segment buying is strong while catalog distribution stays muted under tariff uncertainty. Supplyframe Commodity IQ indicates a 5% STMicroelectronics MCU price increase effective April 26.
Procurement recommendation: Re quote standard MCU prices wherever a qualified alternate exists, starting with the fast shipping option: Re quote against ATSAMD21G18A-AU stock and pricing.
When to Use Which MCU
These are the featured MCUs and their decision context for the current supply picture. Buyers should prioritize parts that ship inside one quarter and keep a qualified alternate on every constrained line.
| Part | Manufacturer | Package | When to use | Check availability |
|---|---|---|---|---|
| STM32F103C8T6 | STMicroelectronics | LQFP48 | Existing STM32F1 designs, buy on hand stock now, backlog for Q3 | Check STM32F103C8T6 availability |
| GD32F103C8T6 | GigaDevice | LQFP48 | Pin compatible bridge for STM32F103, dual source only | Compare GD32F103C8T6 stock |
| ATSAMD21G18A-AU | Microchip | TQFP48 | New low power designs, fastest lead time, long life | Check ATSAMD21G18A-AU stock |
| ESP32-S3-WROOM-1-N16R8 | Espressif | SMD module | Connected designs needing WiFi and BLE, abundant stock | View ESP32-S3-WROOM-1-N16R8 stock |
| MIMX8MM6CVTKZAA | NXP | FCBGA 486 | Linux class compute, highest lead time risk, secure or redesign | Confirm MIMX8MM6CVTKZAA lead times |
Sourcing guidance: Prioritize the widely stocked, fast shipping MCU for discretionary demand this quarter: Move new low power demand to ATSAMD21G18A-AU.