STM32F103ZCT6TR — 72 MHz Cortex-M3 with 256 KB Flash in 144-LQFP
This is the Tape & Reel variant of the base STM32F103ZCT6, intended for automated assembly lines.
What the 72 MHz core and 256 KB Flash mean for your BOM
The 72 MHz ARM Cortex-M3 core places this part in the mid-performance tier of the STM32F1 family — fast enough for motor control loops, USB packet handling, and CAN message processing without needing a higher-cost M4 or M7 part. The 256 KB Flash is sufficient for moderate application code, a real-time OS kernel, and communication stacks; the 48 KB SRAM gives room for several packet buffers and a modest heap. If your firmware image is pushing past 200 KB or you need double-precision floating-point, you are looking at the wrong density tier.
Peripheral set — USB, CAN, and 21-channel ADC
The DMA controller can offload peripheral data transfers without stalling the core.
Package and mounting — 144-LQFP, 20x20 mm body
The 144-LQFP package has a 20x20 mm body with a 0.5 mm pin pitch. It is a surface-mount part intended for reflow soldering.