It comes in a 100-WLCSP package measuring 4.2×4.7 mm, making it a fit for space-constrained embedded control and sensor-fusion applications.
512 KB Flash and 80K x 8 RAM — firmware and data budget
The 512 KB Flash (512K x 8) provides room for complex application firmware, bootloader, and OTA staging buffers without external memory. The 80K x 8 SRAM supports real-time data acquisition, stack-heavy DSP libraries, and multi-protocol communication stacks. For sensor-fusion or motor-control loops that demand fast context switching, the 72 MHz Cortex-M4 with single-cycle multiply-accumulate handles the arithmetic without stalling the bus.
100-WLCSP — footprint and assembly considerations
This saves board area but demands tight PCB land-pattern tolerances and a controlled reflow profile. The 77 I/O count in this footprint gives good routing density for mixed-signal designs. MSL is typically 1 for WLCSP, but verify the specific moisture sensitivity level from the latest STM application note before opening the sealed reel.
The base product number STM32F303 covers a broad family of density and package variants, ensuring long-term supply continuity for the platform.