Why STM32 MCUs Are Frequently Targeted
The immense popularity of STMicroelectronics Cortex-M MCUs (STM32F1, F4, G0, WB series) has made them prime candidates for grey-market remarking. Fraudulent brokers often sand down cheaper clones (like GD32, APM32, or lower-spec STM32 variants) and laser-etch high-value part numbers on the package surface.
3 Reliable Verification Steps
1. Laser Marking & Dimple Analysis
Genuine ST chips have uniform, chemically precise laser etching. Inspect the mold dimple (Pin 1 indicator): genuine packages have smooth, unpainted mold depressions. If laser etching runs across a painted-over dimple, it has been blacktopped.
2. Unique Device ID (UID) Register Readout
Every genuine STM32 contains a factory-programmed 96-bit Unique Device ID stored in system memory. Clones or remarked devices often return duplicated UIDs, invalid lot codes, or zeros.
3. Flash & SRAM Boundary Probing
Attempting to write and verify data past the official memory boundary of the labeled part number will reveal whether you are holding an inferior silicon die.
At Shenzhen By Technology, all ICs undergo traceable incoming inspection. Contact us for verified STM32 stock.