120 MHz Cortex-M4 with 2 MB Flash — what the memory and speed mean for the BOM
The STM32L4S5AII6: The 2 MB Flash and 640 KB SRAM support OTA firmware updates and hold a VGA frame buffer or multiple protocol stacks. The 120 MHz core handles sensor fusion, audio processing, or real-time control loops.
If your system lives inside a weatherproof enclosure or a factory floor panel, this grade is a clean fit.
Package and footprint — 169-UFBGA 7x7 mm
The 169-UFBGA package measures 7x7 mm. The 140 I/O lines require a multi-layer PCB with microvias or blind vias.
Peripherals and connectivity — what is on-chip
The peripheral set includes CANbus, multiple I²C and SPI interfaces, SAI for audio, USB OTG, and an EBI/EMI bus for external memory or parallel peripherals. The 16x12-bit ADC and 2x12-bit DAC cover analog front-end tasks without external converters.
Lifecycle and sourcing posture
ST continues to manufacture this device as part of the current STM32L4S series lineup.