The STM32F412VEH6: 81 I/Os, CANbus, USB OTG, QSPI, and multiple serial interfaces, plus a 16-channel 12-bit ADC. This is a mid-density STM32F4 part.
The 512 KB Flash gives room for a full RTOS, TCP/IP stack, and application code; the 256 KB SRAM supports multiple frame buffers or a decent data logging buffer. If your firmware footprint is tight, this is the tier where you don't need external memory for most tasks.
100-UFBGA 7x7 — rework and layout notes
The small footprint makes it a good fit for space-constrained designs like handheld instruments or compact motor drives.
It remains suitable for new design-ins and ongoing production. For dual-sourcing resilience, pin-compatible siblings in the STM32F412 value line share the same footprint — check the STM32F412 reference manual for the exact peripheral set differences.