16 MHz STM8 core with 8 KB Flash — what the memory budget buys
The STM8S903F3U6TR is an 8-bit microcontroller from ST's STM8S value line, built around the STM8 core running at 16 MHz.
Peripherals and I/O — connectivity for control applications
The integrated peripherals include a 5-channel 10-bit ADC, PWM outputs, brown-out detect, power-on reset, and a watchdog timer — a typical set for motor control, sensor interface, or human-machine interface (HMI) applications.
Housed in a 20-pin UFQFPN package (3 mm x 3 mm), the device is surface-mount only. The small footprint suits space-constrained PCBs in handheld or compact equipment.