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STM32L431KBU6
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
markdownSTM32L431KBU6
STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · UFQFPN-32(5x5)
STM32L431KBU6 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, 1.71 to 3.6 V |
| 2 | PC14 | bidirectional | Port C pin 14, 32 kHz oscillator input, EVENTOUT alternate function, OSC32_IN additional function |
| 3 | PC15 | bidirectional | Port C pin 15, 32 kHz oscillator output, EVENTOUT alternate function, OSC32_OUT additional function |
| 4 | NRST | input | Bidirectional reset pin with embedded weak pull-up resistor |
| 5 | VDDA | power_in | Analog power supply and positive reference voltage for ADC, DAC, OPAMP, COMP, VREFBUF, 1.62 to 3.6 V when analog peripherals used |
| 6 | PA0 | bidirectional | Port A pin 0, FT_a structure, TIM2_CH1, USART2_CTS, COMP1_OUT, SAI1_EXTCLK, ADC1_IN5, OPAMP1_VINP, RTC_TAMP2, WKUP1, CK_IN alternate/additional functions |
| 7 | PA1 | bidirectional | Port A pin 1, FT_a structure, TIM2_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE, ADC1_IN6, OPAMP1_VINM, COMP1_INP alternate/additional functions |
| 8 | PA2 | bidirectional | Port A pin 2, FT_a structure, TIM2_CH3, USART2_TX, LPUART1_TX, QUADSPI_BK1_NCS, ADC1_IN7, COMP2_OUT, TIM15_CH1 alternate/additional functions |
| 9 | PA3 | bidirectional | Port A pin 3, TT structure, TIM2_CH4, USART2_RX, LPUART1_RX, QUADSPI_CLK, ADC1_IN8, OPAMP1_VOUT, COMP2_INP alternate/additional functions |
| 10 | PA4 | bidirectional | Port A pin 4, TT structure, SPI1_NSS, SPI3_NSS, USART2_CK, ADC1_IN9, DAC1_OUT1, COMP1_INM, COMP2_INM alternate/additional functions |
| 11 | PA5 | bidirectional | Port A pin 5, TT structure, TIM2_CH1, TIM2_ETR, SPI1_SCK, ADC1_IN10, DAC1_OUT2, COMP1_INM, COMP2_INM, LPTIM2_ETR alternate/additional functions |
| 12 | PA6 | bidirectional | Port A pin 6, FT_a structure, TIM1_BKIN, SPI1_MISO, COMP1_OUT, USART3_CTS, ADC1_IN11, QUADSPI_BK1_IO3, TIM16_CH1 alternate/additional functions |
| 13 | PA7 | bidirectional | Port A pin 7, FT_fa structure, TIM1_CH1N, I2C3_SCL, SPI1_MOSI, QUADSPI_BK1_IO2, ADC1_IN12, COMP2_OUT alternate/additional functions |
| 14 | PB0 | bidirectional | Port B pin 0, FT_a structure, TIM1_CH2N, SPI1_NSS, USART3_CK, QUADSPI_BK1_IO1, ADC1_IN15, COMP1_OUT, SAI1_EXTCLK alternate/additional functions |
| 15 | PB1 | bidirectional | Port B pin 1, FT_a structure, TIM1_CH3N, USART3_RTS_DE, LPUART1_RTS_DE, QUADSPI_BK1_IO0, ADC1_IN16, COMP1_INM, LPTIM2_IN1 alternate/additional functions |
| 16 | VSS | power_in | Ground pin |
| 17 | VDD | power_in | Main power supply, 1.71 to 3.6 V |
| 18 | PA8 | bidirectional | Port A pin 8, FT structure, MCO, TIM1_CH1, USART1_CK, SWPMI1_IO, SAI1_SCK_A, LPTIM2_OUT alternate functions |
| 19 | PA9 | bidirectional | Port A pin 9, FT_f structure with Fm+ capability, TIM1_CH2, I2C1_SCL, USART1_TX, SAI1_FS_A, TIM15_BKIN alternate functions |
| 20 | PA10 | bidirectional | Port A pin 10, FT_f structure with Fm+ capability, TIM1_CH3, I2C1_SDA, USART1_RX, SAI1_SD_A alternate functions |
| 21 | PA11 | bidirectional | Port A pin 11, FT structure, TIM1_CH4, TIM1_BKIN2, SPI1_MISO, COMP1_OUT, USART1_CTS, CAN1_RX, TIM1_BKIN2_COMP1 alternate functions |
| 22 | PA12 | bidirectional | Port A pin 12, FT structure, TIM1_ETR, SPI1_MOSI, USART1_RTS_DE, CAN1_TX alternate functions |
| 23 | PA13 | bidirectional | Port A pin 13 / JTMS-SWDIO, after reset configured as JTAG debug port with internal pull-up, SWPMI1_TX, SAI1_SD_B, IR_OUT alternate functions |
| 24 | PA14 | bidirectional | Port A pin 14 / JTCK-SWCLK, after reset configured as JTAG debug port with internal pull-down, LPTIM1_OUT, I2C1_SMBA, SWPMI1_RX, SAI1_FS_B alternate functions |
| 25 | PA15 | bidirectional | Port A pin 15 / JTDI, after reset configured as JTAG input with internal pull-up, TIM2_CH1, TIM2_ETR, USART2_RX, SPI1_NSS, SPI3_NSS, USART3_RTS_DE, SWPMI1_SUSPEND alternate functions |
| 26 | PB3 | bidirectional | Port B pin 3 / JTDO-TRACESWO, after reset configured as JTAG output with FT_a structure, TIM2_CH2, SPI1_SCK, SPI3_SCK, USART1_RTS_DE, SAI1_SCK_B, COMP2_INM alternate/additional functions |
| 27 | PB4 | bidirectional | Port B pin 4 / NJTRST, after reset configured as JTAG input with FT_fa structure, I2C3_SDA, SPI1_MISO, SPI3_MISO, USART1_CTS, TSC_G2_IO1, SAI1_MCLK_B, COMP2_INP alternate/additional functions |
| 28 | PB5 | bidirectional | Port B pin 5, FT structure, LPTIM1_IN1, I2C1_SMBA, SPI1_MOSI, SPI3_MOSI, USART1_CK, TSC_G2_IO2, COMP2_OUT, SAI1_SD_B, TIM16_BKIN alternate functions |
| 29 | PB6 | bidirectional | Port B pin 6, FT_fa structure, LPTIM1_ETR, I2C1_SCL, USART1_TX, TSC_G2_IO3, SAI1_FS_B, TIM16_CH1N, COMP2_INP alternate functions |
| 30 | PB7 | bidirectional | Port B pin 7, FT_fa structure, LPTIM1_IN2, I2C1_SDA, USART1_RX, TSC_G2_IO4, COMP2_INM, PVD_IN alternate/additional functions |
| 31 | PH3 | bidirectional | Port H pin 3 / BOOT0, selects boot mode between Flash memory and system bootloader on power-up or reset |
| 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:
STM32L431KBU6 - Footprint:
Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm - 3D model: UFQFPN-32(5x5) (KiCad packages3D, STEP)
- 3D model files:
stm32l431kbu6-etched.step/stm32l431kbu6-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);stm32l431kbu6.step/stm32l431kbu6.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (208 pp, sha256
71963de3cb899f8f, retrieved 2026-10-01, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, 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).