ARM Cortex-M4 at 100 MHz in a WLCSP footprint
The 64-WLCSP package (3.62 x 3.65 mm) saves board area but demands careful handling: the fine pitch means X-ray inspection is the norm for rework, and the MSL rating should be confirmed before the reel hits the reflow oven.
Supply voltage and peripheral set
The peripheral list includes CANbus, USB OTG, QSPI, multiple SPI/I²C/UART, and an EBI/EMI interface for external memory or FPGA glue — a flexible set for a gateway or display controller. 50 I/O lines in a 64-ball package — the WLCSP ballout needs a verified footprint from the STM32F412 reference design, not a generic 0.4 mm pitch pattern.
The STM32F412 family has broad second-source availability through ST's own distribution network; no pin-compatible second-source from another vendor is documented in the ST cross-reference.