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STM32G431KBU3
Public Made by Adomby adom
STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSTM32G431KBU3
STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · UFQFPN-32(5x5)
STM32G431KBU3 from STMicroelectronics, in a UFQFPN-32(5x5). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model, then checked against ST open pin data); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VDD | power_in | Main power supply voltage input, 1.71 V to 3.6 V |
| 2 | PF0-OSC_IN | bidirectional | 5V tolerant I/O pin with analog switch driven by VDDA, oscillator input for 4-48 MHz crystal or external clock source |
| 3 | PF1-OSC_OUT | bidirectional | 3.6V tolerant I/O pin with analog switch driven by VDDA, oscillator output for 4-48 MHz crystal |
| 4 | PG10-NRST | bidirectional | System reset input pin with embedded weak pull-up resistor, 5V tolerant I/O |
| 5 | PA0 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC1/ADC2 input channel 1, COMP1_INM/COMP3_INP, RTC_TAMP2, WKUP1 |
| 6 | PA1 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC1/ADC2 input channel 2, COMP1_INP/OPAMP1_VINP/OPAMP3_VINP |
| 7 | PA2 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC1 input channel 3, COMP2_INM/OPAMP1_VOUT, WKUP4/LSCO |
| 8 | PA3 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC1 input channel 4, COMP2_INP/OPAMP1_VINM/OPAMP1_VINP |
| 9 | PA4 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC2 input channel 17, DAC1_OUT1, COMP1_INM |
| 10 | PA5 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC2 input channel 13, DAC1_OUT2, COMP2_INM/OPAMP2_VINM |
| 11 | PA6 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC2 input channel 3, OPAMP2_VOUT |
| 12 | PA7 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC2 input channel 4, COMP2_INP/OPAMP1_VINP/OPAMP2_VINP |
| 13 | PB0 | bidirectional | 3.6V tolerant I/O pin with analog switch, ADC1 input channel 15, COMP4_INP/OPAMP2_VINP/OPAMP3_VINP |
| 14 | VSSA | power_in | Analog ground pin |
| 15 | VDDA | power_in | Analog power supply input, 1.62 V to 3.6 V, shares reference with VREFBUF_OUT |
| 16 | VSS | power_in | Ground pin |
| 17 | VDD | power_in | Main power supply voltage input, 1.71 V to 3.6 V |
| 18 | PA8 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, MCO/I2C3_SCL/I2C2_SDA/TIM1_CH1 |
| 19 | PA9 | bidirectional | 5V tolerant I/O pin with dead battery function for USB Type-C PD, I2C3_SMBA/I2C2_SCL/TIM1_CH2 |
| 20 | PA10 | bidirectional | 5V tolerant I/O pin with dead battery function for USB Type-C PD and analog switch, USB_CRS_SYNC/TIM1_CH3 |
| 21 | PA11 | bidirectional | 5V tolerant I/O pin with USB function (USB_DM), SPI2_MOSI/TIM1_CH1N/COMP1_OUT/FDCAN1_RX |
| 22 | PA12 | bidirectional | 5V tolerant I/O pin with USB function (USB_DP), TIM16_CH1/I2SCKIN/TIM1_CH2N/COMP2_OUT/FDCAN1_TX |
| 23 | PA13 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, SWDIO-JTMS/TIM16_CH1N/I2C1_SCL |
| 24 | PA14 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, SWCLK-JTCK/LPTIM1_OUT/I2C1_SDA |
| 25 | PA15 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, JTDI/TIM2_CH1/I2C1_SCL/SPI1_NSS |
| 26 | PB3 | bidirectional | 5V tolerant I/O pin, JTDO-TRACESWO/TIM2_CH2/SPI1_SCK/USART2_TX |
| 27 | PB4 | bidirectional | 5V tolerant I/O pin with USB Type-C PD capability (UCPD1_CC2), JTRST/TIM16_CH1/SPI1_MISO |
| 28 | PB5 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, TIM16_BKIN/TIM3_CH2/SPI1_MOSI |
| 29 | PB6 | bidirectional | 5V tolerant I/O pin with USB Type-C PD capability (UCPD1_CC1), TIM16_CH1N/TIM4_CH1/USART1_TX |
| 30 | PB7 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, TIM17_CH1N/TIM4_CH2/I2C1_SDA/USART1_RX, PVD_IN |
| 31 | PB8-BOOT0 | bidirectional | 5V tolerant I/O pin with Fm+ (I2C Fast mode plus) capability, boot mode selection, TIM16_CH1/I2C1_SCL/USART3_RX |
| 32 | VSS | power_in | Ground pin |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | UFQFPN-32(5x5) |
| Category | Embedded Processors & Controllers |
| Pins | 33 |
CAD (KiCad official)
- Symbol:
STM32G431KBU3 - Footprint:
Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm - 3D model: UFQFPN-32(5x5) (KiCad packages3D, STEP)
- 3D model files:
stm32g431kbu3-etched.step/stm32g431kbu3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);stm32g431kbu3.step/stm32g431kbu3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (197 pp, sha256
caaa126a00ab9e06, retrieved 2026-10-01, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).