This is the mid-density sweet spot of the STM32F4 series: enough headroom for a real-time control loop, a communications stack, and a modest GUI buffer, without paying for the 2 MB parts.
Peripheral set — what connects without external chips
The 114 I/O lines in the 144-LQFP package give plenty of GPIO for parallel LCDs or sensor arrays.
Industrial temperature and active lifecycle
ROHS3 compliant, so it passes current environmental regulations without a waiver.
Package and footprint — 144-LQFP (20x20 mm)
The 20x20 mm body is large enough for manual rework with a hot-air station — no BGA underfill or X-ray inspection needed.