The STMicroelectronics STM8AF6246UAX is an 8-bit microcontroller from the STM8A automotive-grade family, built around the STM8 core running at 16 MHz.
STMicroelectronics is winding down support; the part remains available for existing production runs through last-time-buy windows and surplus channels, but it should not be selected for new board designs. For a new project, look at the current STM8A family members in the same 32-VFQFN footprint — the base product number STM8 covers the active siblings.
32-VFQFN exposed pad — layout and rework notes
The package is a 32-VFQFN with an exposed thermal pad (5x5 mm). The pad needs a solid via-stitch to the ground plane to pull heat out — without it, junction temperature climbs fast above 85°C ambient.