GD32F103RCT6

The GD32F103RCT6 is the LQFP-64 member of the GigaDevice GD32F103 mainstream microcontroller family. Its Arm Cortex-M3 core runs at up to 108 MHz with 256 KB of Flash and 48 KB of SRAM, and the 64-pin package exposes the family's full peripheral set of timers, ADCs, USART, SPI, I2C, CAN and USB device interfaces. The family is widely designed in as a footprint-compatible alternative in STM32F103-class sockets, which makes this code a supply-resilience play for industrial control, consumer and IoT products already tooled for that pinout. Selection advice: pin-compatible is not firmware-identical, so clock-tree, Flash wait-state and peripheral errata differences must be revalidated on GD32 silicon before volume commitment; the RC letters pin the 256 KB Flash and 64-pin combination, and the T6 suffix is the tray/temperature form to quote exactly. Parameters verified against GigaDevice documentation.