The STM32F103C8T6 is a mainstream performance line 32-bit microcontroller from STMicroelectronics based on the ARM Cortex-M3 core. It is part of the STM32F1 series (medium-density performance line), widely recognized as the classic “blue pill” microcontroller and one of the most popular entry-level ARM MCUs.

The device features a 72 MHz ARM Cortex-M3 CPU capable of delivering up to 90 DMIPS (1.25 DMIPS/MHz) with single-cycle multiplication and hardware division. It integrates 64 KB Flash memory and 20 KB SRAM. The on-chip memory can be expanded via the flexible static memory controller (FSMC) on larger package variants.

A key advantage of the STM32F103C8T6 is its rich peripheral set combined with cost-effectiveness. It includes a CAN 2.0B controller and USB 2.0 full-speed device interface, which are rare at this price point. The advanced motor control PWM timer features dead-time generation and complementary outputs, making it suitable for driving brushless DC (BLDC) motor controllers.

The device supports multiple boot modes (main Flash, system memory for serial bootloader, SRAM) configurable via BOOT0 and BOOT1 pins. Programming/debugging is available through both SWD (2-pin) and JTAG (5-pin) interfaces, with SWD recommended to conserve I/O pins.

Typical current consumption:

Operating mode: ~36 mA at 72 MHz
Sleep mode: reduced CPU activity
Standby mode: as low as 2 µA
VBAT supply: powers RTC and backup registers

Parameters

Parameters	Values
Manufacturer	STMicroelectronics
Part Number	STM32F103C8T6
Core Architecture	ARM Cortex-M3 32-bit RISC
Max Frequency	72 MHz (90 DMIPS)
Flash Memory	64 KB
SRAM	20 KB
Supply Voltage (VDD)	2.0V to 3.6V
GPIO Pins	37 (LQFP-48)
ADC	2 × 12-bit, 1 µs, up to 16 channels
Timers	7 timers: 1 advanced control PWM, 3 general-purpose, 2 watchdog, 1 SysTick
DMA Channels	7-channel DMA controller
Communication Interfaces	2 × I2C, 2 × SPI, 3 × USART, 1 × CAN 2.0B, 1 × USB 2.0 FS
Debug Interfaces	SWD, JTAG
CRC Unit	Yes
Unique ID	96-bit
Operating Temperature	-40°C to +85°C (Industrial grade)
Package Type	LQFP-48 (7×7×1.4 mm)
Packaging	Tray (1,500 pcs/tray)
RoHS Status	ECOPACK®2 compliant (RoHS)

Applications

Motor control and drives – BLDC (brushless DC) motor controllers, servo drives, robotics, balance cars
Industrial automation – PLC systems, programmable logic controllers, inverters, factory automation
Consumer electronics – Smart home devices, wearable electronics, gaming peripherals
PC and gaming peripherals – Keyboards, mice, printers, scanners, GPS platforms
Medical and handheld equipment – Portable patient monitors, diagnostic devices, handheld instruments
IoT (Internet of Things) – Sensor nodes, smart gateways, wireless communication modules
Building automation – Alarm systems, video intercoms, HVAC (Heating, Ventilation, Air Conditioning) control
Automotive electronics – Aftermarket ECUs (Engine Control Units), vehicle communication interfaces (CAN bus nodes)
Smart lighting systems – Voice-controlled lamp systems, audio-controlled lighting

Note: The STM32F103C8T6 is an active, in-production device from STMicroelectronics. For new projects requiring lower power consumption or more advanced security features, consider newer-generation STM32 devices (e.g., STM32G0, STM32L0, STM32F4 series). For surface-mount automated assembly, tape & reel packaging options are also available.