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Microcontrollers
We have handled 0 microcontrollers part numbers, 0 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.
Cross-reference by brand
Equivalents by brand at the same rating. Green = we have handled it and the cell links through. This is not a drop-in guarantee — use it to narrow the search.
| Rating | ST | GigaDevice | Geehy 极海 |
|---|---|---|---|
| Cortex-M3 72MHz 64KB LQFP48 | STM32F103C8T6 | GD32F103C8T6 | APM32F103C8T6 |
| Cortex-M0 48MHz 64KB LQFP48 | STM32F030C8T6 | GD32F030C8T6 | |
| Cortex-M4 168/180MHz 1MB LQFP100 | STM32F407VGT6 | GD32F407VGT6 |
Part numbers in this category
We handle this category, but there is no line-item record in the system yet. This page stays up — the part table appears here automatically once we hold or have handled stock.
For now, use part search, or set a stock alert。
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.