STM32F105RBT6

STM32F105RBT6 is an STMicroelectronics connectivity-line microcontroller shown as Active on the ST online store: an Arm Cortex-M3 core at 72 MHz with 128 KB of Flash and 64 KB of SRAM in a 64-pin LQFP package (10 x 10 mm), rated from -40 °C to +85 °C. The F105 is the USB-and-CAN member of the STM32F1 family: it integrates a USB 2.0 OTG full-speed controller and two CAN 2.0B controllers alongside the standard F1 peripheral set of USARTs, SPI, I2C, 12-bit ADCs and advanced timers, so one device can bridge a CAN vehicle or machine bus to a USB host without an external protocol converter. The selection point is exactly that peripheral combination at the F1 price and ecosystem level — mature toolchains, long production history and a 64-pin footprint that keeps routing simple on two-layer and four-layer boards. Selection advice: choose the F105 when the design needs USB OTG plus dual CAN; step up to the F107 (also in this family) when an Ethernet MAC is required, and stay with the F103 line when neither USB OTG nor the second CAN is used, since those codes are cheaper for plain control tasks.