The STMicroelectronics STM8L101K3T3 is an 8-bit MCU from the STM8L EnergyLite series, built around the STM8 core and clocked at 16 MHz. The internal oscillator keeps the external crystal off the BOM, though an external clock can still be used if tighter timing is needed.
The STM8L EnergyLite family is a mature, widely deployed platform with long-term supply commitment from ST.
Package and footprint — 32-LQFP, 7x7 mm
The 30 I/O pins leave only two pins for supply and ground, so the pinout is dense but standard for this class. Tray shipping is the default, but tape-and-reel options are available through the supply chain.