STM8S003K3T6CTR — 8-bit MCU for cost-sensitive control
The STMicroelectronics STM8S003K3T6CTR is an 8-bit microcontroller from the STM8S value line, built around the STM8 core running at 16 MHz.
Tight memory budget — plan the firmware map
With 8 KB Flash and 1 KB RAM, the firmware footprint must be lean. The 128-byte EEPROM handles calibration constants and configuration parameters without wearing the Flash. If the application grows beyond this memory envelope, consider stepping up to the STM8S003F3 variant with 8 KB Flash and 1 KB RAM in a smaller package, or the STM8S105 family for 16 KB Flash and 2 KB RAM.
That covers most indoor and outdoor equipment — appliance control panels, HVAC fan coils, LED lighting drivers, and basic motor drives.