150°C-rated 8-bit MCU for under-hood and industrial high-temp nodes
It runs at 16 MHz from a 3V to 5.5V supply, with 16 KB of Flash program memory, 2K x 8 RAM, and 512 x 8 EEPROM. This combination targets automotive body-control modules, engine-management nodes, and industrial controllers that must operate reliably in high-ambient-temperature environments.
NRND — plan for last-time buy or alternative
This means STMicroelectronics is not actively supporting new design-ins, though the part remains available for existing production runs through the independent distribution channel. Buyers with ongoing BOM requirements should evaluate a last-time-buy window or identify a pin-compatible replacement within the STM8A family. The official product status is NRND, so sourcing through surplus or broker channels is the typical path for filling orders.
16 MHz core and 150°C junction — what drives the fit
The 16 MHz core speed is modest by today's standards, but for an 8-bit MCU in a high-temperature automotive node, it is a deliberate trade-off: the STM8A architecture keeps switching losses low enough to stay within the thermal budget at 150°C ambient. The 16 KB Flash and 2K x 8 RAM are sized for control-loop code and small data buffers, not for large firmware images. The 512 x 8 EEPROM provides non-volatile storage for calibration constants and fault logs without requiring external memory. The 7-channel 10-bit ADC covers analog sensor inputs typical in automotive body and chassis applications.
32-LQFP and AEC-Q100 qualification
Housed in a 32-LQFP package with 25 I/O, the STM8AF6246TDSSSY fits standard surface-mount assembly processes. The AEC-Q100 qualification confirms it meets automotive stress tests for reliability under thermal cycling, humidity, and extended temperature exposure.