GD32C103CBT6 from GigaDevice Semicon Beijing, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VBAT	power_in	Backup battery supply (1.8-3.6 V) for the RTC and backup domain when VDD is absent.
2	PC13/TAMPER-RTC	bidirectional	General-purpose I/O PC13. Alternate function: RTC tamper detect input / RTC alarm/second output. Limited drive when powered from VBAT.
3	PC14/OSC32IN	bidirectional	General-purpose I/O PC14. Alternate function: 32.768 kHz LSE crystal input (OSC32IN).
4	PC15/OSC32OUT	bidirectional	General-purpose I/O PC15. Alternate function: 32.768 kHz LSE crystal output (OSC32OUT).
5	PD0/OSCIN	input	HSE crystal/oscillator input (OSCIN, 4-32 MHz). Can be remapped to PD0 GPIO. Note: PD0/PD1 cannot be used for EXTI in this package.
6	PD1/OSCOUT	output	HSE crystal oscillator output (OSCOUT). Can be remapped to PD1 GPIO. Note: PD0/PD1 cannot be used for EXTI in this package.
7	NRST	bidirectional	Bidirectional device reset input / open-drain reset output, active low.
8	VSSA	power_in	Analog ground reference for ADC, DAC and VREF.
9	VDDA	power_in	Analog supply for ADC, DAC and internal VREF (2.6-3.6 V, tied to VDD if ADC/DAC are unused within spec).
10	PA0/WKUP	bidirectional	GPIO PA0. Alt: WKUP wakeup input, USART1_CTS, ADC01_IN0, TIMER1_CH0/ETI, TIMER4_CH0.
11	PA1	bidirectional	GPIO PA1. Alt: USART1_RTS, ADC01_IN1, TIMER4_CH1, TIMER1_CH1.
12	PA2	bidirectional	GPIO PA2. Alt: USART1_TX, TIMER4_CH2, ADC01_IN2, TIMER8_CH0, TIMER1_CH2, SPI0_IO2.
13	PA3	bidirectional	GPIO PA3. Alt: USART1_RX, TIMER4_CH3, ADC01_IN3, TIMER1_CH3, TIMER8_CH1, SPI0_IO3.
14	PA4	bidirectional	GPIO PA4. Alt: SPI0_NSS, USART1_CK, DAC0_OUT0, ADC01_IN4. Remap: SPI2_NSS, I2S2_WS.
15	PA5	bidirectional	GPIO PA5. Alt: SPI0_SCK, ADC01_IN5, DAC0_OUT1.
16	PA6	bidirectional	GPIO PA6. Alt: SPI0_MISO, ADC01_IN6, TIMER2_CH0, TIMER12_CH0. Remap: TIMER0_BRKIN.
17	PA7	bidirectional	GPIO PA7. Alt: SPI0_MOSI, ADC01_IN7, TIMER2_CH1, TIMER13_CH0. Remap: TIMER0_CH0_ON.
18	PB0	bidirectional	GPIO PB0. Alt: ADC01_IN8, TIMER2_CH2. Remap: TIMER0_CH1_ON.
19	PB1	bidirectional	GPIO PB1. Alt: ADC01_IN9, TIMER2_CH3. Remap: TIMER0_CH2_ON.
20	PB2/BOOT1	bidirectional	GPIO PB2 (5 V-tolerant), also sampled as BOOT1 boot-mode select at reset.
21	PB10	bidirectional	GPIO PB10 (5 V-tolerant). Alt: I2C1_SCL, USART2_TX. Remap: TIMER1_CH2.
22	PB11	bidirectional	GPIO PB11 (5 V-tolerant). Alt: I2C1_SDA, USART2_RX. Remap: TIMER1_CH3.
23	VSS_1	power_in	Digital ground.
24	VDD_1	power_in	Digital supply (2.6-3.6 V).
25	PB12	bidirectional	GPIO PB12 (5 V-tolerant). Alt: SPI1_NSS, I2S1_WS, I2C1_SMBA, USART2_CK, TIMER0_BRKIN, CAN1_RX.
26	PB13	bidirectional	GPIO PB13 (5 V-tolerant). Alt: SPI1_SCK, I2S1_CK, USART2_CTS, TIMER0_CH0_ON, CAN1_TX, I2C1_TXFRAME.
27	PB14	bidirectional	GPIO PB14 (5 V-tolerant). Alt: SPI1_MISO, USART2_RTS, TIMER0_CH1_ON, TIMER11_CH0.
28	PB15	bidirectional	GPIO PB15 (5 V-tolerant). Alt: SPI1_MOSI, I2S1_SD, TIMER0_CH2_ON, TIMER11_CH1.
29	PA8	bidirectional	GPIO PA8 (5 V-tolerant). Alt: USART0_CK, TIMER0_CH0, CK_OUT0, USBFS_SOF, CTC_SYNC.
30	PA9	bidirectional	GPIO PA9 (5 V-tolerant). Alt: USART0_TX, TIMER0_CH1, USBFS_VBUS.
31	PA10	bidirectional	GPIO PA10 (5 V-tolerant). Alt: USART0_RX, TIMER0_CH2, USBFS_ID.
32	PA11	bidirectional	GPIO PA11 (5 V-tolerant). Alt: USART0_CTS, CAN0_RX, USBFS_DM (USB full-speed D-), TIMER0_CH3.
33	PA12	bidirectional	GPIO PA12 (5 V-tolerant). Alt: USART0_RTS, CAN0_TX, USBFS_DP (USB full-speed D+), TIMER0_ETI.
34	PA13/JTMS/SWDIO	bidirectional	SWD data / JTAG TMS by default. Can be released as PA13 GPIO via AFIO debug remap.
35	VSS_2	power_in	Digital ground.
36	VDD_2	power_in	Digital supply (2.6-3.6 V).
37	PA14/JTCK/SWCLK	bidirectional	SWD clock / JTAG TCK by default. Can be released as PA14 GPIO via AFIO debug remap.
38	PA15/JTDI	bidirectional	JTAG TDI by default. Alt: SPI2_NSS, I2S2_WS. Remap: TIMER1_CH0/ETI, PA15, SPI0_NSS.
39	PB3/JTDO	bidirectional	JTAG TDO / SWO by default. Alt: SPI2_SCK, I2S2_CK. Remap: TIMER1_CH1, PB3, SPI0_SCK.
40	PB4/NJTRST	bidirectional	JTAG NJTRST by default. Alt: SPI2_MISO, I2C0_TXFRAME. Remap: TIMER2_CH0, PB4, SPI0_MISO.
41	PB5	bidirectional	GPIO PB5. Alt: I2C0_SMBA, SPI2_MOSI, I2S2_SD. Remap: TIMER2_CH1, SPI0_MOSI, CAN1_RX.
42	PB6	bidirectional	GPIO PB6 (5 V-tolerant). Alt: I2C0_SCL, TIMER3_CH0. Remap: USART0_TX, CAN1_TX, SPI0_IO2.
43	PB7	bidirectional	GPIO PB7 (5 V-tolerant). Alt: I2C0_SDA, TIMER3_CH1. Remap: USART0_RX, SPI0_IO3.
44	BOOT0	input	Boot-mode select input, sampled at reset together with BOOT1 (PB2).
45	PB8	bidirectional	GPIO PB8 (5 V-tolerant). Alt: TIMER3_CH2, TIMER9_CH0. Remap: I2C0_SCL, CAN0_RX.
46	PB9	bidirectional	GPIO PB9 (5 V-tolerant). Alt: TIMER3_CH3, TIMER10_CH0. Remap: I2C0_SDA, CAN0_TX.
47	VSS_3	power_in	Digital ground.
48	VDD_3	power_in	Digital supply (2.6-3.6 V).

Key specifications

Parameter	Value
Manufacturer	GigaDevice Semicon Beijing
Package	LQFP-48(7x7)
Category	MCU
Pins	48

Ordering variants

Same part, different packaging or reel option.

GD32C103CBT6
GD32C103CBT6CET6
GD32C103CBT6C8T6
GD32C103CBT6TBU6
GD32C103CBT6TEU6
GD32C103CBT6RBT6
GD32C103CBT6RET6
GD32C103CBT6R8T6
GD32C103CBT6VBT6
GD32C103CBT6VET6
GD32C103CBT6V8T6
GD32C103CBT6ZBH6
GD32C103CBT6ZEH6

CAD (KiCad official)

Symbol: GD32C103CBT6
Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
3D model: LQFP-48(7x7) (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: GigaDevice Semicon Beijing datasheet (99 pp, sha256 bd4df4decb53d015, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF