8-bit MCU for cost-sensitive control — 16 MHz, 4 KB Flash, 20-pin SOIC
The STMicroelectronics STM8S103F2M6 is an 8-bit microcontroller from the STM8S family, built around the STM8 core and clocked at 16 MHz. It packs 4 KB of Flash program memory, 1 KB of RAM, and 640 bytes of EEPROM in a 20-pin SOIC package — a footprint that fits on small sensor nodes, motor-control boards, and appliance PCBs where every millimetre of board area counts.
Memory and peripheral headroom — sizing the firmware target
With 4 KB of Flash (4K x 8), the firmware image is tightly bounded — think a single control loop with a UART command parser and a small state machine, not a multitasking RTOS. The 1 KB RAM (1K x 8) leaves about 800 bytes after the stack and interrupt vectors, enough for a couple of 128-byte buffers. The 640-byte EEPROM (640 x 8) is useful for calibration constants or fault logs that survive a power cycle without needing external storage.
On-chip data converters and oscillators — reducing external BOM
The STM8S103F2M6 integrates a 5-channel 10-bit ADC, so you can read analogue sensors (thermistors, potentiometers, current shunts) without an external converter chip.
Package and mounting — 20-SOIC wide-body
Housed in a 20-SOIC (0.295", 7.50 mm width) package, the part is surface-mount only. The 20-SO supplier package code maps to a standard SOIC-20 wide-body footprint — no exotic land pattern required.
The ROHS3 compliance is current, so no exemption expiry is a concern for European-market builds.