72 MHz Cortex-M4 with DSP and FPU — what it buys you
The STM32F302RET6TR: The Cortex-M4 core includes a single-precision FPU and DSP instruction set, so you can run a PID loop and a sensor fusion filter without a separate DSP. The 16-channel 12-bit ADC and one 12-bit DAC on-chip mean many mixed-signal control designs — motor drives, digital power supplies, industrial sensors — can skip the external analog front-end.
Peripheral set and I/O budget for control applications
With 51 I/O lines in a 64-LQFP package, this part has enough GPIO to handle a parallel LCD interface, encoder inputs, and a bank of relay drivers simultaneously. On the connectivity side you get CANbus, I²C, SPI, UART/USART, USB, IrDA, and LINbus — enough to talk to a VFD over Modbus RTU, log data to a USB stick, and still have a debug UART free.
If you are dual-sourcing a BOM line, the STM32L151CBU6A is a lower-speed (32 MHz), lower-power Cortex-M3 alternative with similar analog peripherals, but it is not a pin-for-pin drop — the LQFP-64 footprint matches, but the peripheral set and core differ.