GD32F303CBT6 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 domain power supply. Powers the RTC, LSE oscillator and backup registers when VDD is absent; typical 1.8 V to 3.6 V.
2	PC13-TAMPER-RTC	bidirectional	General-purpose I/O PC13 in the backup domain; alternate function TAMPER-RTC provides tamper detect input and RTC alarm/second output.
3	PC14-OSC32IN	bidirectional	GPIO PC14 or 32.768 kHz LSE crystal oscillator input (OSC32IN). Selection via RCU_BDCTL LSEEN.
4	PC15-OSC32OUT	bidirectional	GPIO PC15 or 32.768 kHz LSE crystal oscillator output (OSC32OUT).
5	OSCIN	input	High-speed external (HSE) crystal oscillator input, typically 4 to 32 MHz. Can be remapped to PD0 in this package (PD0 not usable for EXTI).
6	OSCOUT	output	High-speed external (HSE) crystal oscillator output. Can be remapped to PD1 in this package.
7	NRST	bidirectional	Bidirectional device reset, active low. Pulled low by internal or external reset sources; requires external RC (typ. 10 kOhm pull-up, 100 nF cap) for noise immunity.
8	VSSA	power_in	Analog ground for the ADC, DAC and analog reference supply. Must be connected to the system ground; keep noise decoupled from VSS.
9	VDDA	power_in	Analog supply for ADC, DAC and analog reference. Typical 2.6-3.6 V, decouple with 10 nF + 1 uF near the pin.
10	PA0-WKUP	bidirectional	GPIO PA0 with alternate functions WKUP wake-up input, USART1_CTS, ADC012_IN0, TIMER1_CH0, TIMER1_ETI, TIMER4_CH0.
11	PA1	bidirectional	GPIO PA1 with alternate functions USART1_RTS, ADC012_IN1, TIMER1_CH1, TIMER4_CH1.
12	PA2	bidirectional	GPIO PA2 with alternate functions USART1_TX, ADC012_IN2, TIMER1_CH2, TIMER4_CH2, TIMER8_CH0 (GD32F303CG only), SPI0_IO2.
13	PA3	bidirectional	GPIO PA3 with alternate functions USART1_RX, ADC012_IN3, TIMER1_CH3, TIMER4_CH3, TIMER8_CH1 (GD32F303CG only), SPI0_IO3.
14	PA4	bidirectional	GPIO PA4 with default alternate functions SPI0_NSS, USART1_CK, ADC01_IN4, DAC_OUT0; remap SPI2_NSS, I2S2_WS.
15	PA5	bidirectional	GPIO PA5 with alternate functions SPI0_SCK, ADC01_IN5, DAC_OUT1.
16	PA6	bidirectional	GPIO PA6 with alternate functions SPI0_MISO, ADC01_IN6, TIMER2_CH0, TIMER12_CH0 (GD32F303CG only); remap TIMER0_BRKIN.
17	PA7	bidirectional	GPIO PA7 with alternate functions SPI0_MOSI, ADC01_IN7, TIMER2_CH1, TIMER13_CH0 (GD32F303CG only); remap TIMER0_CH0_ON.
18	PB0	bidirectional	GPIO PB0 with alternate functions ADC01_IN8, TIMER2_CH2; remap TIMER0_CH1_ON.
19	PB1	bidirectional	GPIO PB1 with alternate functions ADC01_IN9, TIMER2_CH3; remap TIMER0_CH2_ON.
20	PB2	bidirectional	GPIO PB2, also BOOT1 boot-mode select input strapped at reset. 5 V tolerant.
21	PB10	bidirectional	GPIO PB10 (5 V tolerant) with alternate functions I2C1_SCL, USART2_TX; remap TIMER1_CH2.
22	PB11	bidirectional	GPIO PB11 (5 V tolerant) with alternate functions I2C1_SDA, USART2_RX; remap TIMER1_CH3.
23	VSS_1	power_in	Digital ground supply return.
24	VDD_1	power_in	Digital core/IO supply, 2.6-3.6 V; decouple with a 100 nF ceramic close to the pin.
25	PB12	bidirectional	GPIO PB12 (5 V tolerant) with alternate functions SPI1_NSS, I2C1_SMBA, USART2_CK, TIMER0_BRKIN, I2S1_WS.
26	PB13	bidirectional	GPIO PB13 (5 V tolerant) with alternate functions SPI1_SCK, USART2_CTS, TIMER0_CH0_ON, I2S1_CK.
27	PB14	bidirectional	GPIO PB14 (5 V tolerant) with alternate functions SPI1_MISO, USART2_RTS, TIMER0_CH1_ON, TIMER11_CH0 (GD32F303CG only).
28	PB15	bidirectional	GPIO PB15 (5 V tolerant) with alternate functions SPI1_MOSI, TIMER0_CH2_ON, I2S1_SD, TIMER11_CH1 (GD32F303CG only).
29	PA8	bidirectional	GPIO PA8 (5 V tolerant) with alternate functions USART0_CK, TIMER0_CH0, CK_OUT0 clock output, CTC_SYNC.
30	PA9	bidirectional	GPIO PA9 (5 V tolerant) with alternate functions USART0_TX, TIMER0_CH1.
31	PA10	bidirectional	GPIO PA10 (5 V tolerant) with alternate functions USART0_RX, TIMER0_CH2.
32	PA11	bidirectional	GPIO PA11 (5 V tolerant) with alternate functions USART0_CTS, CAN0_RX, USBDM (USB D-), TIMER0_CH3.
33	PA12	bidirectional	GPIO PA12 (5 V tolerant) with alternate functions USART0_RTS, CAN0_TX, TIMER0_ETI, USBDP (USB D+).
34	PA13	bidirectional	Default JTMS/SWDIO (Serial-Wire Debug data). Can be remapped to GPIO PA13 by freeing the debug function.
35	VSS_2	power_in	Digital ground supply return.
36	VDD_2	power_in	Digital core/IO supply, 2.6-3.6 V; decouple with a 100 nF ceramic close to the pin.
37	PA14	bidirectional	Default JTCK/SWCLK (Serial-Wire Debug clock). Can be remapped to GPIO PA14.
38	PA15	bidirectional	Default JTDI (JTAG data in). Alternate SPI2_NSS, I2S2_WS; remap TIMER1_CH0, TIMER1_ETI, PA15 GPIO, SPI0_NSS.
39	PB3	bidirectional	Default JTDO (JTAG data out). Alternate SPI2_SCK, I2S2_CK; remap GPIO PB3, TRACESWO, TIMER1_CH1, SPI0_SCK.
40	PB4	bidirectional	Default NJTRST (JTAG reset, active low). Alternate SPI2_MISO; remap TIMER2_CH0, GPIO PB4, SPI0_MISO.
41	PB5	bidirectional	GPIO PB5 with alternate functions I2C0_SMBA, SPI2_MOSI, I2S2_SD; remap TIMER2_CH1, SPI0_MOSI.
42	PB6	bidirectional	GPIO PB6 (5 V tolerant) with alternate functions I2C0_SCL, TIMER3_CH0; remap USART0_TX, SPI0_IO2.
43	PB7	bidirectional	GPIO PB7 (5 V tolerant) with alternate functions I2C0_SDA, TIMER3_CH1; remap USART0_RX, SPI0_IO3.
44	BOOT0	input	Boot mode select input sampled at reset (combined with BOOT1/PB2) to choose boot from main flash, system memory (bootloader) or SRAM.
45	PB8	bidirectional	GPIO PB8 (5 V tolerant) with alternate functions TIMER3_CH2, TIMER9_CH0 (GD32F303CG only); remap I2C0_SCL, CAN0_RX.
46	PB9	bidirectional	GPIO PB9 (5 V tolerant) with alternate functions TIMER3_CH3, TIMER10_CH0 (GD32F303CG only); remap I2C0_SDA, CAN0_TX.
47	VSS_3	power_in	Digital ground supply return.
48	VDD_3	power_in	Digital core/IO supply, 2.6-3.6 V; decouple with a 100 nF ceramic close to the pin.

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.

GD32F303CBT6
GD32F303CCT6
GD32F303CET6
GD32F303CGT6
GD32F303RBT6
GD32F303RCT6
GD32F303RET6
GD32F303RGT6
GD32F303RIT6
GD32F303RKT6
GD32F303VBT6
GD32F303VCT6
GD32F303VET6
GD32F303VGT6
GD32F303VIT6
GD32F303VKT6
GD32F303ZCT6
GD32F303ZET6
GD32F303ZGT6
GD32F303ZIT6
GD32F303ZKT6

CAD (KiCad official)

Symbol: GD32F303CBT6
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 98e6e299f43ef5ac, 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