The STMicroelectronics STM8AL3138TAY is an 8-bit MCU from the STM8A automotive-grade family, built around the STM8 core at 16 MHz. It packs 8 KB of Flash program memory, 2K x 8 of RAM, and 1K x 8 of EEPROM, with 41 I/O lines and a rich set of peripherals including I²C, SPI, UART/USART, LIN, and IrDA. The 48-LQFP package (7x7 mm) and a supply range of 1.65 V to 3.6 V make it a fit for space-constrained, low-power control applications in automotive body electronics, industrial sensors, and battery-powered modules.
At 16 MHz, this core handles typical sensor polling, PWM generation, and LIN-bus communication without breaking a sweat. It is not a high-throughput part — you are not running complex DSP or heavy protocol stacks on it. The 12-bit ADC with 25 channels and a single 12-bit DAC cover analog front-end needs for multi-sensor acquisition in automotive or industrial feedback loops.
NRND — where it sits in the cycle
That means ST has flagged it for eventual phase-out; new BOMs should look at the STM8A successor line or a pin-compatible alternative within the STM8A family. For existing production, the part remains available through independent distribution — we source and quote it to order against an RFQ. Do not freeze a new design around this order code without a confirmed second-source or migration plan.