The STM32L4 series is a current, volume-shipping family from ST, so supply continuity is a planning exercise, not a crisis.
80 MHz Cortex-M4 — enough for DSP and control loops
The core runs at 80 MHz with a single-precision FPU and DSP instructions, so it handles sensor fusion, motor-control math, or audio processing without an external coprocessor. The 128 KB of Flash and 40 KB of SRAM are sized for moderate firmware stacks — think a Bluetooth LE gateway, a field sensor node, or a portable instrument — not a full GUI or dual-image OTA partition.
Connectivity and peripherals — Quad SPI, USB, multiple UARTs
On the peripheral side you get Quad SPI for external Flash or RAM expansion, USB 2.0 full-speed, multiple I2C and SPI buses, plus UART/USART and LINbus for industrial fieldbus. The 10-channel 12-bit ADC covers analog inputs like thermistors or current shunts. The 26 GPIOs in the 32-UFQFPN package are tight — plan your pin allocation early if you need both a display interface and a sensor array.
Package and footprint — 5x5 mm, exposed pad, MSL3
Housed in a 32-UFQFPN (5x5 mm) with an exposed pad, this is a compact surface-mount package suited for space-constrained PCBs.