36 MHz ARM Cortex-M3 with 1 MB Flash — the high-density access line
This is the high-density variant in the 144-pin LQFP package, offering 112 I/O lines for parallel bus interfaces, sensor arrays, or large control panels. It is designed for cost-sensitive industrial control, building automation, and motor drive applications where the full feature set of the STM32F103 (USB, CAN, higher-speed ADC) is not required.
1 MB Flash — firmware headroom for complex stacks
The 1 MB Flash density is the standout feature here — it supports large firmware images, OTA update staging with dual-bank support, or extensive lookup tables without external memory. The 80 KB RAM handles moderate data buffering and RTOS task stacks; for heavy data acquisition you'll want to budget the RAM against your queue sizes.
112 I/O in a 144-LQFP — board-level routing considerations
The 144-LQFP (20x20 mm) package gives 112 I/O, but that many signals demand careful PCB layout. The 0.5 mm pitch requires fine trace routing between pads.
ST lists this part as Active. There is no last-time-buy or NRND notice in the record.