GD32F303RET6 from GigaDevice Semicon Beijing, in a LQFP-64(10x10). 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 for RTC and backup registers when VDD is absent (1.8-3.6 V).
2	PC13/TAMPER-RTC	bidirectional	GPIO Port C bit 13. Alternate: TAMPER-RTC (RTC tamper detection / RTC alarm out). Powered from VBAT domain - limited drive.
3	PC14/OSC32IN	bidirectional	GPIO Port C bit 14. Alternate: OSC32IN low-speed (32.768 kHz) crystal input. Powered from VBAT domain.
4	PC15/OSC32OUT	bidirectional	GPIO Port C bit 15. Alternate: OSC32OUT low-speed (32.768 kHz) crystal output. Powered from VBAT domain.
5	OSCIN	input	High-speed external (HSE) crystal / clock input. Can be remapped to PD0 (PD0/PD1 cannot be used for EXTI in this package).
6	OSCOUT	output	High-speed external (HSE) crystal output. Can be remapped to PD1.
7	NRST	bidirectional	Active-low bidirectional device reset. Internal weak pull-up; drive low externally to reset. Also driven low by internal reset sources.
8	PC0	bidirectional	GPIO Port C bit 0. Alternate: ADC012_IN10 (ADC0/1/2 channel 10 analog input).
9	PC1	bidirectional	GPIO Port C bit 1. Alternate: ADC012_IN11.
10	PC2	bidirectional	GPIO Port C bit 2. Alternate: ADC012_IN12.
11	PC3	bidirectional	GPIO Port C bit 3. Alternate: ADC012_IN13.
12	VSSA	power_in	Analog ground reference for ADC, DAC and reset circuitry. Connect to solid analog-ground plane.
13	VDDA	power_in	Analog supply (2.6-3.6 V) for ADC, DAC, reset and internal analog blocks. Decouple with 100 nF + 1 uF close to pin.
14	PA0-WKUP	bidirectional	GPIO Port A bit 0. Alternates: WKUP (standby wake), USART1_CTS, ADC012_IN0, TIMER1_CH0, TIMER1_ETI, TIMER4_CH0, TIMER7_ETI.
15	PA1	bidirectional	GPIO Port A bit 1. Alternates: USART1_RTS, ADC012_IN1, TIMER1_CH1, TIMER4_CH1.
16	PA2	bidirectional	GPIO Port A bit 2. Alternates: USART1_TX, ADC012_IN2, TIMER1_CH2, TIMER4_CH2, TIMER8_CH0, SPI0_IO2.
17	PA3	bidirectional	GPIO Port A bit 3. Alternates: USART1_RX, ADC012_IN3, TIMER1_CH3, TIMER4_CH3, TIMER8_CH1, SPI0_IO3.
18	VSS_4	power_in	Digital ground return #4. Tie all VSS_x pins together to the ground plane.
19	VDD_4	power_in	Digital core/IO supply #4 (2.6-3.6 V). Decouple with 100 nF near pin.
20	PA4	bidirectional	GPIO Port A bit 4. Alternates: SPI0_NSS, USART1_CK, ADC01_IN4, DAC0_OUT0. Remap: SPI2_NSS, I2S2_WS.
21	PA5	bidirectional	GPIO Port A bit 5. Alternates: SPI0_SCK, ADC01_IN5, DAC0_OUT1.
22	PA6	bidirectional	GPIO Port A bit 6. Alternates: SPI0_MISO, ADC01_IN6, TIMER2_CH0, TIMER7_BRKIN, TIMER12_CH0. Remap: TIMER0_BRKIN.
23	PA7	bidirectional	GPIO Port A bit 7. Alternates: SPI0_MOSI, ADC01_IN7, TIMER2_CH1, TIMER7_CH0_ON, TIMER13_CH0. Remap: TIMER0_CH0_ON.
24	PC4	bidirectional	GPIO Port C bit 4. Alternate: ADC01_IN14.
25	PC5	bidirectional	GPIO Port C bit 5. Alternate: ADC01_IN15.
26	PB0	bidirectional	GPIO Port B bit 0. Alternates: ADC01_IN8, TIMER2_CH2, TIMER7_CH1_ON. Remap: TIMER0_CH1_ON.
27	PB1	bidirectional	GPIO Port B bit 1. Alternates: ADC01_IN9, TIMER2_CH3, TIMER7_CH2_ON. Remap: TIMER0_CH2_ON.
28	PB2/BOOT1	bidirectional	GPIO Port B bit 2, also BOOT1 boot-select strap (sampled with BOOT0 at reset). 5 V tolerant.
29	PB10	bidirectional	GPIO Port B bit 10 (5 V tolerant). Alternates: I2C1_SCL, USART2_TX. Remap: TIMER1_CH2.
30	PB11	bidirectional	GPIO Port B bit 11 (5 V tolerant). Alternates: I2C1_SDA, USART2_RX. Remap: TIMER1_CH3.
31	VSS_1	power_in	Digital ground return #1.
32	VDD_1	power_in	Digital core/IO supply #1 (2.6-3.6 V). Decouple with 100 nF near pin.
33	PB12	bidirectional	GPIO Port B bit 12 (5 V tolerant). Alternates: SPI1_NSS, I2C1_SMBA, USART2_CK, TIMER0_BRKIN, I2S1_WS.
34	PB13	bidirectional	GPIO Port B bit 13 (5 V tolerant). Alternates: SPI1_SCK, USART2_CTS, TIMER0_CH0_ON, I2S1_CK.
35	PB14	bidirectional	GPIO Port B bit 14 (5 V tolerant). Alternates: SPI1_MISO, USART2_RTS, TIMER0_CH1_ON, TIMER11_CH0.
36	PB15	bidirectional	GPIO Port B bit 15 (5 V tolerant). Alternates: SPI1_MOSI, TIMER0_CH2_ON, I2S1_SD, TIMER11_CH1.
37	PC6	bidirectional	GPIO Port C bit 6 (5 V tolerant). Alternates: I2S1_MCK, TIMER7_CH0, SDIO_D6. Remap: TIMER2_CH0.
38	PC7	bidirectional	GPIO Port C bit 7 (5 V tolerant). Alternates: I2S2_MCK, TIMER7_CH1, SDIO_D7. Remap: TIMER2_CH1.
39	PC8	bidirectional	GPIO Port C bit 8 (5 V tolerant). Alternates: TIMER7_CH2, SDIO_D0. Remap: TIMER2_CH2.
40	PC9	bidirectional	GPIO Port C bit 9 (5 V tolerant). Alternates: TIMER7_CH3, SDIO_D1. Remap: TIMER2_CH3.
41	PA8	bidirectional	GPIO Port A bit 8 (5 V tolerant). Alternates: USART0_CK, TIMER0_CH0, CK_OUT0 (MCO), CTC_SYNC.
42	PA9	bidirectional	GPIO Port A bit 9 (5 V tolerant). Alternates: USART0_TX, TIMER0_CH1.
43	PA10	bidirectional	GPIO Port A bit 10 (5 V tolerant). Alternates: USART0_RX, TIMER0_CH2.
44	PA11	bidirectional	GPIO Port A bit 11 (5 V tolerant). Alternates: USART0_CTS, CAN0_RX, USBDM, TIMER0_CH3.
45	PA12	bidirectional	GPIO Port A bit 12 (5 V tolerant). Alternates: USART0_RTS, CAN0_TX, TIMER0_ETI, USBDP.
46	PA13/JTMS/SWDIO	bidirectional	Default JTAG TMS / SWD IO after reset. Can be remapped to PA13 GPIO once debug is disabled. 5 V tolerant.
47	VSS_2	power_in	Digital ground return #2.
48	VDD_2	power_in	Digital core/IO supply #2 (2.6-3.6 V). Decouple with 100 nF near pin.
49	PA14/JTCK/SWCLK	bidirectional	Default JTAG TCK / SWD CLK after reset. Can be remapped to PA14 GPIO once debug is disabled. 5 V tolerant.
50	PA15/JTDI	bidirectional	Default JTAG TDI. Alternates: SPI2_NSS, I2S2_WS. Remap: TIMER1_CH0, TIMER1_ETI, PA15 GPIO, SPI0_NSS. 5 V tolerant.
51	PC10	bidirectional	GPIO Port C bit 10 (5 V tolerant). Alternates: UART3_TX, SDIO_D2. Remap: USART2_TX, SPI2_SCK, I2S2_CK.
52	PC11	bidirectional	GPIO Port C bit 11 (5 V tolerant). Alternates: UART3_RX, SDIO_D3. Remap: USART2_RX, SPI2_MISO.
53	PC12	bidirectional	GPIO Port C bit 12 (5 V tolerant). Alternates: UART4_TX, SDIO_CK. Remap: USART2_CK, SPI2_MOSI, I2S2_SD.
54	PD2	bidirectional	GPIO Port D bit 2 (5 V tolerant). Alternates: TIMER2_ETI, SDIO_CMD, UART4_RX.
55	PB3/JTDO	bidirectional	Default JTAG TDO. Alternates: SPI2_SCK, I2S2_CK. Remap: PB3 GPIO, TRACESWO, TIMER1_CH1, SPI0_SCK. 5 V tolerant.
56	PB4/NJTRST	bidirectional	Default JTAG NJTRST (active-low). Alternate: SPI2_MISO. Remap: TIMER2_CH0, PB4 GPIO, SPI0_MISO. 5 V tolerant.
57	PB5	bidirectional	GPIO Port B bit 5. Alternates: I2C0_SMBA, SPI2_MOSI, I2S2_SD. Remap: TIMER2_CH1, SPI0_MOSI.
58	PB6	bidirectional	GPIO Port B bit 6 (5 V tolerant). Alternates: I2C0_SCL, TIMER3_CH0. Remap: USART0_TX, SPI0_IO2.
59	PB7	bidirectional	GPIO Port B bit 7 (5 V tolerant). Alternates: I2C0_SDA, TIMER3_CH1. Remap: USART0_RX, SPI0_IO3.
60	BOOT0	input	Boot mode select strap sampled at reset (together with BOOT1). Selects main Flash / system memory / embedded SRAM boot.
61	PB8	bidirectional	GPIO Port B bit 8 (5 V tolerant). Alternates: TIMER3_CH2, SDIO_D4, TIMER9_CH0. Remap: I2C0_SCL, CAN0_RX.
62	PB9	bidirectional	GPIO Port B bit 9 (5 V tolerant). Alternates: TIMER3_CH3, SDIO_D5, TIMER10_CH0. Remap: I2C0_SDA, CAN0_TX.
63	VSS_3	power_in	Digital ground return #3.
64	VDD_3	power_in	Digital core/IO supply #3 (2.6-3.6 V). Decouple with 100 nF near pin.

Key specifications

Parameter	Value
Manufacturer	GigaDevice Semicon Beijing
Package	LQFP-64(10x10)
Category	MCU
Pins	64

Ordering variants

Same part, different packaging or reel option.

GD32F303RET6RCT6
GD32F303RET6RCT7
GD32F303RET6
GD32F303RET6RET7
GD32F303RET6RGT6
GD32F303RET6RIT6
GD32F303RET6RKT6
GD32F303RET6CCT6
GD32F303RET6CET6
GD32F303RET6CGT6
GD32F303RET6CCU6
GD32F303RET6CEU6
GD32F303RET6CGU6
GD32F303RET6VCT6
GD32F303RET6VET6
GD32F303RET6VET7
GD32F303RET6VGT6
GD32F303RET6VGT7
GD32F303RET6VIT6
GD32F303RET6VKT6
GD32F303RET6ZCT6
GD32F303RET6ZET6
GD32F303RET6ZGT6
GD32F303RET6ZIT6
GD32F303RET6ZKT6

CAD (KiCad official)

Symbol: GD32F303RET6
Footprint: Package_QFP:LQFP-64_10x10mm_P0.5mm
3D model: LQFP-64(10x10) (KiCad packages3D, STEP)

Provenance

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

Datasheet: GigaDevice Semicon Beijing datasheet (103 pp, sha256 df6b797095a9416e, 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