The STM32L476QEI6: It targets applications where a balance of processing throughput and energy efficiency is required — think battery-operated industrial sensors, portable medical monitors, and HMI panels that need a rich peripheral set without a separate power-management IC.
With 109 I/O lines and a connectivity list that includes USB OTG, CANbus, QSPI, SAI, and multiple UART/I²C/SPI interfaces, this part can serve as the central controller in a mixed-signal system. The integrated LCD controller and DMA engine offload the core for display updates and data movement.
Packaged in a 132-ball UFBGA (7x7 mm).
For dual-sourcing or supply resilience, the STM32L151CBU6A (Cortex-M3, 32 MHz, 37 I/O) is a lower-density sibling but not a pin-compatible drop-in — the L4 series offers higher performance and more peripherals.