24 MHz STM8 core — 32 KB Flash, 6 KB RAM, 1 KB EEPROM
The STM8S207S6T6CTR is an 8-bit microcontroller from STMicroelectronics' STM8S family, built around the STM8 core running at 24 MHz.
The wide Vdd range from 2.95 V to 5.5 V means this MCU can sit directly on a 3.3 V or a 5 V power rail. In a mixed-voltage system you avoid the cost and board area of a level shifter on the MCU's supply side — just match the I/O voltage domain to the peripherals.
44-LQFP — fine-pitch surface-mount footprint
The package is a 44-lead LQFP with 0.8 mm pitch. The board land pattern must match the JEDEC MO-220 standard for this body size. The exposed pad (if present — verify from the mechanical drawing) should be stitched to a ground plane with thermal vias to keep junction temperature under control when driving all I/O near the rated sink/source current.
STMicroelectronics lists this part as Active. If you are dual-sourcing for supply resilience, the STM8S207 family includes several density and package variants that are pin-compatible across the same 44-LQFP footprint — check the STM8S reference manual for the exact cross-reference matrix.