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STM32L431KBU6

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STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.

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docs stm32l431kbu6: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
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README.md Initial commit: component/stm32l431kbu6 · Ray 4d ago
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stm32l431kbu6-etched.glb stm32l431kbu6: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
stm32l431kbu6-etched.step stm32l431kbu6: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
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STM32L431KBU6

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l431kbu6.step / stm32l431kbu6.glb are 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, primary claude-haiku-4-5-20251001 (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