Black Pill pinout

This STM32F103 board uses a four-contact SWD connector with GND, CLK, DIO and 3V3 in that order. Its debug connector differs from the Blue Pill and WeAct MiniF4.

STM32F103C8T6 Black Pill

43 contacts Current package

WeAct MiniF4 V3.1 44 contacts

STM32 development boards · This STM32F103 board uses a four-contact SWD connector with GND, CLK, DIO and 3V3 in that order. Its debug connector differs from the Blue Pill and WeAct MiniF4.

STM32F103C8T6 Black Pill pinout

Header 1

Use the board connector marking and locate contact 1 before wiring.

Header 2

Use the board connector marking and locate contact 1 before wiring.

SWD header

Use the board connector marking and locate contact 1 before wiring.

USB connector

Use the board connector marking and locate contact 1 before wiring.

Selected pin details

H2-15 · B1

Configurable I/O · GPIO

Routes to MCU PB1. Choose the applicable GPIO or peripheral function in the MCU documentation.

STM32F103C8T6 Black Pill connector map

Electrical limits · Link to this pin

All 43 pins

Pin	Signal	Direction	Function
H1-1	GND Return	Return	Connects to the board’s ground plane.
H1-2	V3.3 Power	Power	Connects to 3V3. Use the specified board power connection.
H1-3	B7 Configurable I/O	Configurable I/O	Routes to MCU PB7. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-4	B6 Configurable I/O	Configurable I/O	Routes to MCU PB6. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-5	B5 Configurable I/O	Configurable I/O	Routes to MCU PB5. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-6	B4 Configurable I/O	Configurable I/O	Routes to MCU PB4. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-7	B3 Configurable I/O	Configurable I/O	Routes to MCU PB3. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-8	A15 Configurable I/O	Configurable I/O	Routes to MCU PA15. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-9	A12 Configurable I/O	Configurable I/O	Routes to MCU PA12. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-10	A11 Configurable I/O	Configurable I/O	Routes to MCU PA11. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-11	A10 Configurable I/O	Configurable I/O	Routes to MCU PA10. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-12	A9 Configurable I/O	Configurable I/O	Routes to MCU PA9. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-13	A8 Configurable I/O	Configurable I/O	Routes to MCU PA8. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-14	B15 Configurable I/O	Configurable I/O	Routes to MCU PB15. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-15	B14 Configurable I/O	Configurable I/O	Routes to MCU PB14. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-16	B13 Configurable I/O	Configurable I/O	Routes to MCU PB13. Choose the applicable GPIO or peripheral function in the MCU documentation.
H1-17	B12 Configurable I/O	Configurable I/O	Routes to MCU PB12. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-1	GND Return	Return	Connects to the board’s ground plane.
H2-2	B8 Configurable I/O	Configurable I/O	Routes to MCU PB8. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-3	B9 Configurable I/O	Configurable I/O	Routes to MCU PB9. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-4	C13 Configurable I/O	Configurable I/O	Routes to MCU PC13. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-5	RST Active-low reset	Active-low reset	Connects to MCU NRST. Use a compatible open-drain reset signal.
H2-6	A0 Configurable I/O	Configurable I/O	Routes to MCU PA0. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-7	A1 Configurable I/O	Configurable I/O	Routes to MCU PA1. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-8	A2 Configurable I/O	Configurable I/O	Routes to MCU PA2. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-9	A3 Configurable I/O	Configurable I/O	Routes to MCU PA3. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-10	A4 Configurable I/O	Configurable I/O	Routes to MCU PA4. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-11	A5 Configurable I/O	Configurable I/O	Routes to MCU PA5. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-12	A6 Configurable I/O	Configurable I/O	Routes to MCU PA6. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-13	A7 Configurable I/O	Configurable I/O	Routes to MCU PA7. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-14	B0 Configurable I/O	Configurable I/O	Routes to MCU PB0. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-15	B1 Configurable I/O	Configurable I/O	Routes to MCU PB1. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-16	B10 Configurable I/O	Configurable I/O	Routes to MCU PB10. Choose the applicable GPIO or peripheral function in the MCU documentation.
H2-17	B11 Configurable I/O	Configurable I/O	Routes to MCU PB11. Choose the applicable GPIO or peripheral function in the MCU documentation.
H3-1	GND Return	Return	Connects to the board’s ground plane.
H3-2	CLK Configurable I/O	Configurable I/O	Routes to MCU PA14. Choose the applicable GPIO or peripheral function in the MCU documentation.
H3-3	DIO Configurable I/O	Configurable I/O	Routes to MCU PA13. Choose the applicable GPIO or peripheral function in the MCU documentation.
H3-4	3V3 Power	Power	Connects to 3V3. Use the specified board power connection.
H4-1	VBUS Power	Power	Connects to 5V. Use the specified board power connection.
H4-2	D- Bidirectional	Bidirectional	USB data line. PCB net destination is PA11.
H4-3	D+ Bidirectional	Bidirectional	USB data line. PCB net destination is PA12.
H4-4	ID Unconfirmed	Unconfirmed	The board source supplies no net for this position. Consult the schematic before use.
H4-5	GND Return	Return	Connects to the board’s ground plane.

Signal assignments

Serial Wire Debug

PA13 is SWDIO and PA14 is SWCLK. The 3.3 V board rail is a reference for a compatible probe.

USART1 on PA9/PA10

PA9 is TX and PA10 is RX in the default USART1 mapping. Select the matching firmware configuration.

Electrical limits

Parameter	Limit	Conditions and source
Board logic rail3.3 V nominal	3.3 V nominal	Check the fitted regulator and MCU datasheet before attaching an external circuit. USB is the only supply used in the example. STM32F103C8T6 Black Pill connector map
External high-speed oscillator8 MHz	8 MHz	Use the correct HSE frequency in firmware clock calculations. STM32F103C8T6 Black Pill connector map

Models and documents

The maps follow the listed PCB variants. Match the board markings and connector positions to the referenced schematic before applying power.

STM32F103C8T6 Black Pill: This STM32F103 board uses a four-contact SWD connector with GND, CLK, DIO and 3V3 in that order. Its debug connector differs from the Blue Pill and WeAct MiniF4.

STM32-base · STM32F103C8T6 Black Pill· Board identification, connector numbering and documented net destinations.
STMicroelectronics MCU datasheet· MCU electrical specifications and package pin functions.