STM32F103RET6

STM32F103RET6 is a 32-bit Arm Cortex-M3 microcontroller from STMicroelectronics in a 64-pin LQFP package, with 512KB Flash and 64KB SRAM - for mainstream embedded control: 72 MHz core, 51 I/O pins, CAN, USB device, SDIO, 3 SPI, 2 I2C, 5 USART, 16-channel 12-bit ADC across 3 ADCs, dual 12-bit DAC, 12-channel DMA, 2.0V to 3.6V supply across -40C to 85C. The high-density 512KB Flash in LQFP-64 is the selection point: maximum F103 code space with a wide peripheral set, backed by the deepest STM32F1 code base, tooling and engineer familiarity in the industry. Business impact: firmware written for any STM32F1 high-density part ports with minimal rework, so teams reuse drivers and qualification evidence across product generations instead of starting over. Selection advice: the RE code denotes 512KB Flash and 64KB SRAM - for 256KB pick the RCT6 code, for 128KB pick the RBT6 code; the T6 suffix is the LQFP-64 tray packing, so specify TR for tape and reel, and match the full code to your BOM since densities are not interchangeable. Parameters verified against STMicroelectronics documentation.