80 MHz Cortex-M4 with 1 MB Flash — where it fits in the STM32L4 line
The part is built for designs that need the DSP and FPU throughput of the Cortex-M4 core while keeping active and sleep currents low.
Connectivity and peripherals — what the 109 I/O and interface set support
Package and assembly — 132-UFBGA (7x7 mm)
The 132-ball UFBGA package measures 7x7 mm, saving board area compared to an LQFP of similar pin count. It is a surface-mount BGA requiring solder-paste printing and reflow — not hand-solderable in production. The small footprint and 0.5 mm ball pitch demand a controlled PCB stack-up and X-ray inspection for voiding, but the density gain is worth it for space-constrained designs.