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Microcontrollers
We have handled 3 microcontrollers part numbers, 3 of them in stock right now. This page lists all of them — including the ones we do not currently hold.
Substitutes: three traps worth knowing
The question we hear most is whether a pin-compatible substitute really drops in. These are the traps we have seen; your own firmware test is the final word.
Pin-compatible is not code-compatible
GD32F103 matches STM32F103 pin-for-pin with the same peripheral names, but clock tree, flash wait states and ADC timing differ — bare-register code usually needs edits, HAL-based code mostly passes. Run a full regression before switching, not a spot check.
MSL is a real constraint
Most LQFP parts are MSL3: 168 hours of floor life once the bag is opened, bake required after that. This is why we ship full unopened reels with MSL bags intact — it is yield, not ceremony.
The suffix carries temperature and packaging
STM32F103C8T6: C8 = 64KB/LQFP48, T = tape/tray, 6 = −40 to 85 °C. The same die with a different suffix prices very differently — align the full suffix before you talk price.
Screening out remarked parts
Popular MCUs attract remarking. Full unopened reels + factory labels + consecutive date codes rule out most loose remarked stock; beyond that, sample decap or third-party testing before payment — we cooperate.
Part numbers in this category
3 part number(s) in stock now. Quantities are summed per part across lots.
| Part number | Brand | Description | Qty | Condition | Packing | Date code | Lot |
|---|---|---|---|---|---|---|---|
| EFM8BB51F16G-C-QFN20R | Silicon Labs | QFN20 · factory reel, 2500 pcs/reel | 5,000 | New, original packaging | Reel | 25+ | 25-line mixed IC lot — Renesas, NXP, TI, Infineon, ADI and more — Shenzhen warehouse |
| STM32H743VIH6 | ST | TFBGA-100 · trays | 1,044 | New, original packaging | Anti-static tray | 2534+ | 25-line mixed IC lot — Renesas, NXP, TI, Infineon, ADI and more — Shenzhen warehouse |
| GD32F470VKH6 | GigaDevice | BGA100 · trays | 156 | New, original packaging | Anti-static tray | 2023+ | 25-line mixed IC lot — Renesas, NXP, TI, Infineon, ADI and more — Shenzhen warehouse |
Common questions
Can I buy by the reel?
Yes — the minimum unit is one unopened reel (we do not break reels; an opened reel is loose stock to the next buyer). Whole-lot pricing is better on multi-reel parts.
Do you functionally test MCUs?
No — that requires your firmware and fixtures. What we provide is the packaging and date-code evidence chain. Sample before payment and test on your own board, or send a third party.
Are you an authorised distributor for these brands?
No, and we have never claimed to be. Stock comes from cancelled projects, plant closures and distributor clear-outs, and every lot says which. See Quality & verification.