The STM32L431RBI6TR: ARM Cortex-M4 with FPU at 80 MHz, 128 KB Flash, 64 KB SRAM. With 52 general-purpose I/Os and a connectivity set that includes CANbus, I²C, SPI, UART/USART, QSPI, and SAI, this MCU can handle a mixed-signal sensor hub, a motor-control node, or a fieldbus gateway without external interface chips. The internal oscillator saves two external components, though a precision clock source is still advisable for CAN or USB timing if your design uses those peripherals.
64-UFBGA (5x5) — footprint and assembly
The small footprint saves board space but complicates manual rework — plan for X-ray inspection of the BGA joints after assembly.
This removes the supply risk for new designs and allows multi-year production commitments.