72 MHz Cortex-M3 with 384 KB Flash — what it buys you
That memory and speed tier puts it above the 128 KB / 64 KB parts in the same family — enough headroom to run a real-time control loop, a USB stack, and a CANopen node without paging code from external memory.
Industrial temperature range and the WLCSP trade-off
The 64-WLCSP (4.47×4.4 mm) saves significant board area compared to an LQFP64 — roughly 7×7 mm vs 4.5×4.4 mm — but it comes with assembly constraints: the package requires a controlled SMT process, stencil design for the fine-pitch bumps, and X-ray inspection for solder-joint integrity. Not a hand-solder or rework-friendly part; plan for a proper reflow profile and a clean PCB surface finish (ENIG or OSP).
Supply voltage and power management
The built-in POR/PVD/PDR circuits handle brown-out detection and power-on reset without an external supervisor — one less BOM line. The internal oscillator can serve as the system clock, though for CAN or USB operation an external crystal is recommended for accuracy.
ST's product status for the STM32F103RDY6TR is Active.