72 MHz Cortex-M3 with 768 KB Flash — the mid-range workhorse
It comes in a 100-pin LQFP package (14x14 mm body) with 80 general-purpose I/O lines.
Peripheral set — motor control, CAN, USB, and analog
This MCU carries a full complement of peripherals for industrial and embedded control: DMA for memory-to-peripheral transfers without CPU loading, a motor-control PWM timer with dead-time insertion and emergency stop, plus a CAN 2.0B interface for industrial networking. USB 2.0 full-speed device interface is included for HMI panels, data loggers, or firmware updates.
Industrial temperature grade — what it buys you
The 105°C ceiling matters for designs that sit near a motor drive, inside a sealed outdoor enclosure, or under a vehicle hood where ambient heat plus self-heating pushes junction temperature above 85°C.
The STM32F1 series has been in production for over a decade and has a broad installed base, so second-source availability through independent distribution is also well established.
Package and footprint — 100-LQFP, hand-solderable
No BGA rework equipment needed. The 80 I/O lines are distributed around all four sides, which simplifies PCB routing compared to a BGA with hidden balls.