STM32F103RBT6

STM32F103RBT6 is a mainstream 32-bit microcontroller from STMicroelectronics in an LQFP-64 package (10 x 10 mm), built on an Arm Cortex-M3 core at 72 MHz with 128 KB of Flash and 20 KB of SRAM, for embedded control, motor drives, industrial I/O and connected equipment. The on-chip connectivity is the selection point in the medium-density F103 line: a USB full-speed port and a CAN 2.0B controller sit alongside the timers and serial interfaces, so many designs need no external bus chips. It operates from 2.0 to 3.6 V across -40 to +85 C, and the code is listed Active on the ST eStore. The family also brings a deep, mature toolchain and code ecosystem, which shortens development and eases long-term maintenance of designs that stay in production for years. Selection advice: the RB code is the 128 KB density in the 64-pin package - the R8 sibling in the same footprint carries 64 KB and the RC carries 256 KB, and firmware is built per density, so match the full STM32F103RBT6 code character-for-character. Parameters verified against STMicroelectronics documentation.