# GD32F303RBT6

**GigaDevice Semicon Beijing** · Microcontrollers (MCU/MPU/SOC) · LQFP-64(10x10)

GD32F303RBT6 from GigaDevice Semicon Beijing, in a LQFP-64(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VBAT | power_in | Backup-domain power supply pin (default function VBAT). |
| 2 | PC13-TAMPER-RTC | bidirectional | I/O with default function PC13 and alternate function TAMPER-RTC. |
| 3 | PC14-OSC32IN | bidirectional | I/O with default function PC14 and alternate function OSC32IN (low-speed oscillator input). |
| 4 | PC15-OSC32OUT | bidirectional | I/O with default function PC15 and alternate function OSC32OUT (low-speed oscillator output). |
| 5 | OSCIN | input | High-speed crystal oscillator input (HXTAL, 4-32 MHz); can be remapped to PD0, which cannot be used for EXTI in this package. |
| 6 | OSCOUT | output | High-speed crystal oscillator output (HXTAL, 4-32 MHz); can be remapped to PD1, which cannot be used for EXTI in this package. |
| 7 | NRST | bidirectional | Device reset pin (default function NRST). |
| 8 | PC0 | bidirectional | I/O with default function PC0 and alternate ADC012_IN10 analog input. |
| 9 | PC1 | bidirectional | I/O with default function PC1 and alternate ADC012_IN11 analog input. |
| 10 | PC2 | bidirectional | I/O with default function PC2 and alternate ADC012_IN12 analog input. |
| 11 | PC3 | bidirectional | I/O with default function PC3 and alternate ADC012_IN13 analog input. |
| 12 | VSSA | power_in | Analog ground pin for the ADC and analog circuitry (default function VSSA). |
| 13 | VDDA | power_in | Analog supply pin for the ADC and analog circuitry (default function VDDA). |
| 14 | PA0-WKUP | bidirectional | I/O with default function PA0; alternate functions include WKUP, USART1_CTS, ADC012_IN0, TIMER1_CH0, TIMER1_ETI, TIMER4_CH0 and TIMER7_ETI. |
| 15 | PA1 | bidirectional | I/O with default function PA1; alternate functions include USART1_RTS, ADC012_IN1, TIMER1_CH1 and TIMER4_CH1. |
| 16 | PA2 | bidirectional | I/O with default function PA2; alternate functions include USART1_TX, ADC012_IN2, TIMER1_CH2, TIMER4_CH2, SPI0_IO2, and TIMER8_CH0 (TIMER8 function available only on RG/I/K devices). |
| 17 | PA3 | bidirectional | I/O with default function PA3; alternate functions include USART1_RX, ADC012_IN3, TIMER1_CH3, TIMER4_CH3, SPI0_IO3, and TIMER8_CH1 (TIMER8 function available only on RG/I/K devices). |
| 18 | VSS_4 | power_in | Ground pin (default function VSS_4). |
| 19 | VDD_4 | power_in | Digital supply pin (default function VDD_4). |
| 20 | PA4 | bidirectional | I/O with default function PA4; alternate functions include SPI0_NSS, USART1_CK, ADC01_IN4 and DAC_OUT0, and remap to SPI2_NSS and I2S2_WS. |
| 21 | PA5 | bidirectional | I/O with default function PA5; alternate functions include SPI0_SCK, ADC01_IN5 and DAC_OUT1. |
| 22 | PA6 | bidirectional | I/O with default function PA6; alternate functions include SPI0_MISO, ADC01_IN6, TIMER2_CH0 and TIMER7_BRKIN, with TIMER0_BRKIN remap and TIMER12_CH0 (RG/I/K devices only). |
| 23 | PA7 | bidirectional | I/O with default function PA7; alternate functions include SPI0_MOSI, ADC01_IN7, TIMER2_CH1 and TIMER7_CH0_ON, with TIMER0_CH0_ON remap and TIMER13_CH0 (RG/I/K devices only). |
| 24 | PC4 | bidirectional | I/O with default function PC4 and alternate function ADC01_IN14 analog input. |
| 25 | PC5 | bidirectional | I/O with default function PC5 and alternate function ADC01_IN15 analog input. |
| 26 | PB0 | bidirectional | I/O with default function PB0; alternate functions include ADC01_IN8, TIMER2_CH2 and TIMER7_CH1_ON, with TIMER0_CH1_ON remap. |
| 27 | PB1 | bidirectional | I/O with default function PB1; alternate functions include ADC01_IN9, TIMER2_CH3 and TIMER7_CH2_ON, with TIMER0_CH2_ON remap. |
| 28 | PB2 | bidirectional | 5 V tolerant I/O with default function PB2, also used as BOOT1. |
| 29 | PB10 | bidirectional | 5 V tolerant I/O with default function PB10; alternate functions include I2C1_SCL and USART2_TX, with TIMER1_CH2 remap. |
| 30 | PB11 | bidirectional | 5 V tolerant I/O with default function PB11; alternate functions include I2C1_SDA and USART2_RX, with TIMER1_CH3 remap. |
| 31 | VSS_1 | power_in | Ground pin (default function VSS_1). |
| 32 | VDD_1 | power_in | Digital supply pin (default function VDD_1). |
| 33 | PB12 | bidirectional | 5 V tolerant I/O with default function PB12; alternate functions include SPI1_NSS, I2C1_SMBA, USART2_CK, TIMER0_BRKIN and I2S1_WS. |
| 34 | PB13 | bidirectional | 5 V tolerant I/O with default function PB13; alternate functions include SPI1_SCK, USART2_CTS, TIMER0_CH0_ON and I2S1_CK. |
| 35 | PB14 | bidirectional | 5 V tolerant I/O with default function PB14; alternate functions include SPI1_MISO, USART2_RTS and TIMER0_CH1_ON, with TIMER11_CH0 (RG/I/K devices only). |
| 36 | PB15 | bidirectional | 5 V tolerant I/O with default function PB15; alternate functions include SPI1_MOSI, TIMER0_CH2_ON and I2S1_SD, with TIMER11_CH1 (RG/I/K devices only). |
| 37 | PC6 | bidirectional | 5 V tolerant I/O with default function PC6; alternate functions include I2S1_MCK, TIMER7_CH0 and SDIO_D6, with TIMER2_CH0 remap. |
| 38 | PC7 | bidirectional | 5 V tolerant I/O with default function PC7; alternate functions include I2S2_MCK, TIMER7_CH1 and SDIO_D7, with TIMER2_CH1 remap. |
| 39 | PC8 | bidirectional | 5 V tolerant I/O with default function PC8; alternate functions include TIMER7_CH2 and SDIO_D0, with TIMER2_CH2 remap. |
| 40 | PC9 | bidirectional | 5 V tolerant I/O with default function PC9; alternate functions include TIMER7_CH3 and SDIO_D1, with TIMER2_CH3 remap. |
| 41 | PA8 | bidirectional | 5 V tolerant I/O with default function PA8; alternate functions include USART0_CK, TIMER0_CH0, CK_OUT0 and CTC_SYNC. |
| 42 | PA9 | bidirectional | 5 V tolerant I/O with default function PA9; alternate functions include USART0_TX and TIMER0_CH1. |
| 43 | PA10 | bidirectional | 5 V tolerant I/O with default function PA10; alternate functions include USART0_RX and TIMER0_CH2. |
| 44 | PA11 | bidirectional | 5 V tolerant I/O with default function PA11; alternate functions include USART0_CTS, CAN0_RX, USBDM and TIMER0_CH3. |
| 45 | PA12 | bidirectional | 5 V tolerant I/O with default function PA12; alternate functions include USART0_RTS, CAN0_TX, TIMER0_ETI and USBDP. |
| 46 | PA13 | bidirectional | 5 V tolerant I/O with default function JTMS/SWDIO; remap to PA13. |
| 47 | VSS_2 | power_in | Ground pin (default function VSS_2). |
| 48 | VDD_2 | power_in | Digital supply pin (default function VDD_2). |
| 49 | PA14 | bidirectional | 5 V tolerant I/O with default function JTCK/SWCLK; remap to PA14. |
| 50 | PA15 | bidirectional | 5 V tolerant I/O with default function JTDI; alternate functions include SPI2_NSS and I2S2_WS, with remaps TIMER1_CH0, TIMER1_ETI, PA15 and SPI0_NSS. |
| 51 | PC10 | bidirectional | 5 V tolerant I/O with default function PC10; alternate functions include UART3_TX and SDIO_D2, with remaps USART2_TX, SPI2_SCK and I2S2_CK. |
| 52 | PC11 | bidirectional | 5 V tolerant I/O with default function PC11; alternate functions include UART3_RX and SDIO_D3, with remaps USART2_RX and SPI2_MISO. |
| 53 | PC12 | bidirectional | 5 V tolerant I/O with default function PC12; alternate functions include UART4_TX and SDIO_CK, with remaps USART2_CK, SPI2_MOSI and I2S2_SD. |
| 54 | PD2 | bidirectional | 5 V tolerant I/O with default function PD2; alternate functions include TIMER2_ETI, SDIO_CMD and UART4_RX. |
| 55 | PB3 | bidirectional | 5 V tolerant I/O with default function JTDO; alternate functions include SPI2_SCK and I2S2_CK, with remaps PB3, TRACESWO, TIMER1_CH1 and SPI0_SCK. |
| 56 | PB4 | bidirectional | 5 V tolerant I/O with default function NJTRST; alternate function SPI2_MISO, with remaps TIMER2_CH0, PB4 and SPI0_MISO. |
| 57 | PB5 | bidirectional | I/O with default function PB5 (not marked 5 V tolerant in the table); alternate functions include I2C0_SMBA, SPI2_MOSI and I2S2_SD, with remaps TIMER2_CH1 and SPI0_MOSI. |
| 58 | PB6 | bidirectional | 5 V tolerant I/O with default function PB6; alternate functions include I2C0_SCL and TIMER3_CH0, with remaps USART0_TX and SPI0_IO2. |
| 59 | PB7 | bidirectional | 5 V tolerant I/O with default function PB7; alternate functions include I2C0_SDA and TIMER3_CH1, with remaps USART0_RX and SPI0_IO3. |
| 60 | BOOT0 | input | Boot mode selection input (default function BOOT0). |
| 61 | PB8 | bidirectional | 5 V tolerant I/O with default function PB8; alternate functions include TIMER3_CH2 and SDIO_D4, with remaps I2C0_SCL and CAN0_RX; TIMER9_CH0 is available only on RG/I/K devices. |
| 62 | PB9 | bidirectional | 5 V tolerant I/O with default function PB9; alternate functions include TIMER3_CH3 and SDIO_D5, with remaps I2C0_SDA and CAN0_TX; TIMER10_CH0 is available only on RG/I/K devices. |
| 63 | VSS_3 | power_in | Ground pin (default function VSS_3). |
| 64 | VDD_3 | power_in | Digital supply pin (default function VDD_3). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GigaDevice Semicon Beijing |
| Package | LQFP-64(10x10) |
| Category | Embedded Processors & Controllers |
| Pins | 64 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| External voltage range (VSS-referenced) | VDD | -0.3 |  | 3.6 | V |  | 51 |
| External analog supply voltage (VSSA-referenced) | VDDA | -0.3 |  | 3.6 | V |  | 51 |
| External battery supply voltage (VSS-referenced) | VBAT | -0.3 |  | 3.6 | V |  | 51 |
| Input voltage on 5V tolerant pin | VIN | -0.3 |  |  | V |  | 51 |
| Input voltage on other I/O | VIN | -0.3 |  | 3.6 | V |  | 51 |
| Variations between different VDD power pins | /ΔVDDX/ |  |  | 50 | mV |  | 51 |
| Variations between different ground pins | /VSSX −VSS/ |  |  | 50 | mV |  | 51 |
| Maximum current for GPIO pins | IIO | -25 |  | 25 | mA |  | 51 |
| Operating temperature range | TA | -40 |  | 85 | °C |  | 51 |
| Power dissipation at TA = 85°C of LQFP64 | PD |  |  | 647 | mW | TA = 85°C | 51 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 51 |
| Maximum junction temperature | TJ |  |  | 125 | °C |  | 51 |
| Supply voltage | VDD | 2.6 | 3.3 | 3.6 | V |  | 51 |
| Analog supply voltage | VDDA | 2.6 | 3.3 | 3.6 | V | Same as VDD | 51 |
| Battery supply voltage | VBAT | 1.8 |  | 3.6 | V |  | 51 |
| AHB clock frequency | fHCLK |  |  | 120 | MHz |  | 52 |
| APB1 clock frequency | fAPB1 |  |  | 60 | MHz |  | 52 |
| APB2 clock frequency | fAPB2 |  |  | 120 | MHz |  | 52 |
| VDD rise time rate | tVDD | 0 |  |  | μs/V |  | 52 |
| VDD fall time rate | tVDD | 20 |  |  | μs/V |  | 52 |
| Crystal or ceramic frequency (HXTAL) | fHXTAL | 4 | 8 | 32 | MHz | 2.6 V ≤ VDD ≤ 3.6 V | 63 |
| Recommended matching capacitance on OSCIN and OSCOUT | CHXTAL |  | 20 | 30 | pF |  | 63 |
| Crystal or ceramic duty cycle (HXTAL) | Ducy(HXTAL) | 30 | 50 | 70 | % |  | 63 |
| External clock source or oscillator frequency (HXTAL bypass) | fHXTAL_ext | 1 |  | 50 | MHz | VDD = 3.3 V | 63 |
| OSCIN high or low time (HXTAL bypass) | tH/L(HXTAL) | 5 |  |  | ns |  | 64 |
| OSCIN rise or fall time (HXTAL bypass) | tR/F(HXTAL) |  |  | 10 | ns |  | 64 |
| Duty cycle (HXTAL bypass) | Ducy(HXTAL) | 40 |  | 60 | % |  | 64 |
| Crystal or ceramic duty cycle (LXTAL) | Ducy(LXTAL) | 30 |  | 70 | % |  | 64 |
| External clock source or oscillator frequency (LXTAL bypass) | fLXTAL_ext |  | 32.768 | 1000 | kHz | VDD = 3.3 V | 65 |
| OSC32IN rise or fall time (LXTAL bypass) | tR/F(LXTAL) |  |  | 50 | ns |  | 65 |
| Duty cycle (LXTAL bypass) | Ducy(LXTAL) | 30 | 50 | 70 | % |  | 65 |
| IRC8M oscillator frequency accuracy, factory-trimmed | ACCIRC8M | -2.5 |  | 2.5 | % | VDD = VDDA = 3.3 V, TA = -40 °C ~ +85 °C | 65 |
| IRC8M oscillator frequency accuracy, factory-trimmed | ACCIRC8M | -1.8 |  | 1.8 | % | VDD = VDDA = 3.3 V, TA = 0 °C ~ +85 °C | 65 |
| IRC8M oscillator frequency accuracy, factory-trimmed | ACCIRC8M | -1 |  | 1 | % | VDD = VDDA = 3.3 V, TA = 25 °C | 65 |
| IRC8M oscillator duty cycle | DucyIRC8M | 45 | 50 | 55 | % | VDD = VDDA = 3.3 V | 65 |
| Low speed internal oscillator (IRC40K) frequency | fIRC40K | 20 | 40 | 45 | kHz | VDD = VDDA = 3.3 V, TA = -40°C ~ +85 °C | 66 |
| IRC48M oscillator frequency accuracy, factory-trimmed | ACCIRC48M | -4 |  | 5 | % | VDD = VDDA = 3.3 V, TA = -40°C ~ +85 °C | 66 |
| IRC48M oscillator frequency accuracy, factory-trimmed | ACCIRC48M | -3 |  | 3 | % | VDD = VDDA = 3.3 V, TA = 0 °C ~ +85 °C | 66 |
| IRC48M oscillator frequency accuracy, factory-trimmed | ACCIRC48M | -2 |  | 2 | % | VDD = VDDA = 3.3 V, TA = 25 °C | 66 |
| IRC48M oscillator duty cycle | DIRC48M | 45 | 50 | 55 | % | VDD = VDDA = 3.3 V | 66 |
| PLL input clock frequency | fPLLIN | 1 |  | 25 | MHz |  | 67 |
| PLL output clock frequency | fPLLOUT | 16 |  | 120 | MHz |  | 67 |
| PLL VCO output clock frequency | fVCO | 32 |  | 240 | MHz |  | 67 |
| PLL lock time | tLOCK |  |  | 300 | μs |  | 67 |
| Low level output voltage for an IO pin | VOL |  |  | 0.17 | V | IIO = +8mA, VDD = 2.6 V | 69 |
| Low level output voltage for an IO pin | VOL |  |  | 0.16 | V | IIO = +8mA, VDD = 3.3 V | 69 |
| Low level output voltage for an IO pin | VOL |  |  | 0.15 | V | IIO = +8mA, VDD = 3.6 V | 69 |
| Low level output voltage for an IO pin | VOL |  |  | 0.4 | V | IIO = +20mA, VDD = 3.3 V | 69 |
| High level output voltage for an IO pin | VOH | 2.4 |  |  | V | IIO = +8mA, VDD = 2.6 V | 69 |
| High level output voltage for an IO pin | VOH | 3.15 |  |  | V | IIO = +8mA, VDD = 3.3 V | 69 |
| High level output voltage for an IO pin | VOH | 3.44 |  |  | V | IIO = +8mA, VDD = 3.6 V | 69 |
| High level output voltage for an IO pin | VOH | 2.8 |  |  | V | IIO = +20mA, VDD = 3.3 V | 69 |
| Internal pull-up resistor (all pins) | RPU | 30 | 40 | 50 | kΩ | VIN = VSS | 69 |
| Internal pull-up resistor (PA10) | RPU | 7.5 | 10 | 13.5 | kΩ |  | 69 |
| Internal pull-down resistor (all pins) | RPD | 30 | 40 | 50 | kΩ | VIN = VDD | 69 |
| Internal pull-down resistor (PA10) | RPD | 7.5 | 10 | 13.5 | kΩ |  | 69 |
| NRST input low level voltage | VIL(NRST) | -0.5 |  |  | V | 2.6 V ≤ VDD = VDDA ≤ 3.6 V | 68 |
| Thermal resistance, junction-to-ambient, LQFP64 | θJA |  | 61.8 |  | °C/W | Natural convection, 2S2P PCB | 93 |
| Thermal resistance, junction-to-board, LQFP64 | θJB |  | 42.83 |  | °C/W | Cold plate, 2S2P PCB | 94 |
| Thermal resistance, junction-to-case, LQFP64 | θJC |  | 21.98 |  | °C/W | Cold plate, 2S2P PCB | 94 |

## CAD (KiCad official)

- Symbol: `GD32F303RBT6`
- Footprint: `Package_QFP:LQFP-64_10x10mm_P0.5mm`
- 3D model: LQFP-64(10x10) (KiCad packages3D, STEP)
- 3D model files: `gd32f303rbt6-etched.step` / `gd32f303rbt6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gd32f303rbt6.step` / `gd32f303rbt6.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [GigaDevice Semicon Beijing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040482538704896) (97 pp, sha256 `904a825ff15e3e3f`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/gd32f303rbt6-datasheet.pdf)