150°C-rated 8-bit MCU for underhood automotive — AEC-Q100 grade-0
The STMicroelectronics STM8AF6223PDU is an 8-bit automotive microcontroller from the STM8A series, qualified to AEC-Q100. It runs at 16 MHz from an internal oscillator, with 8 KB of Flash program memory, 1K x 8 RAM, and 640 x 8 EEPROM — the EEPROM is useful for storing calibration constants and fault codes without external parts. The 150°C operating temperature rating places it in grade-0 territory, suitable for engine-bay or transmission control where standard 125°C parts won't survive. The 5x10-bit ADC handles sensor input from thermistors or potentiometers.
NRND — plan the last-time buy or replacement now
This means ST is winding down production; a last-time-buy window is in effect or imminent. New designs should target the successor or a pin-compatible alternative. For existing BOM lines, secure sufficient lifetime buy stock through independent distribution now — the window will close. The closest pin-compatible alternative within the STM8A family shares the same core, memory, and peripheral set but differs in packaging or temperature grade — verify the exact variant against your assembly and environmental requirements before substituting.
16 MHz core with LINbus — built for body and powertrain networks
The 16 MHz clock drives the STM8A core with single-cycle instruction execution for many opcodes, delivering around 16 MIPS. That's enough for real-time control loops in wiper modules, HVAC actuators, seat controllers, or simple sensor fusion nodes. The LINbus interface connects directly to the vehicle's local interconnect network without an external transceiver — a BOM simplification for body-electronics modules. With 16 I/O lines in a 20-TSSOP package, board area is minimal. Brown-out detect and POR are integrated, so the reset circuit can be a simple RC network.