16 MHz 8-bit MCU for extended-temperature control
The STM8S105K4U3A is an 8-bit microcontroller from STMicroelectronics' STM8S value line, built around the STM8A core and clocked at 16 MHz.
The evidence carries conflicting lifecycle signals: one entry flags an end-of-life stage, while another lists the product status as Active. This ambiguity means a buyer should treat the part as potentially transitioning. If the part does move to last-time-buy, the STM8S family includes pin-compatible density variants that may serve as drop-in replacements — verify the Flash/RAM/EEPROM budget against the firmware image before committing.