Cortex-M4 with analog muscle in a 2.89×3.74 mm footprint
The STM32F303C8Y6TR belongs to the STM32F3 series, with a 72 MHz ARM Cortex-M4 core, 64 KB Flash, 12K x 8 RAM, and a 49-WLCSP package.
72 MHz and the analog complement — what they mean for a BOM decision
The 72 MHz core clock runs the Cortex-M4 FPU and DSP instruction set. The 15-channel 12-bit ADC and 3-channel 12-bit DAC are on-chip.
WLCSP package — board-level and assembly realities
MSL is not stated in this listing, but WLCSP parts from ST typically ship at MSL 1 or MSL 3 — check the bag label before the reflow line. The 37 I/O count is the number of usable GPIOs after accounting for power, ground, and the dedicated analog pins.
It suits factory automation controllers, outdoor telecom nodes, HVAC drives, and automotive cabin (non-engine-bay) modules. The internal oscillator means it can boot without an external crystal, though the HSE path is available for precision timing applications like CAN bus or USB.
ST continues to manufacture the STM32F303 series, and this WLCSP variant is the smallest-footprint option in the 64 KB Flash / 12 KB SRAM density tier.