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STM32L431KCU6TR

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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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STM32L431KCU6TR

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · UFQFPN-32(5x5)

STM32L431KCU6TR 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 input, 1.71V to 3.6V range
2 PC14-OSC32_IN bidirectional Port C pin 14, 5V tolerant input/output, functions as external 32kHz oscillator input when configured as OSC32_IN
3 PC15-OSC32_OUT bidirectional Port C pin 15, 5V tolerant input/output, functions as external 32kHz oscillator output when configured as OSC32_OUT
4 NRST bidirectional Bidirectional reset pin with embedded weak pull-up resistor and debouncing for system reset control
5 VDDA/VREF+ power_in Analog power supply for ADC, DAC, comparators and operational amplifiers, 1.62V to 3.6V, also serves as positive reference voltage
6 PA0/CK_IN bidirectional Port A pin 0, 5V tolerant input/output with analog capability for ADC1_IN5, can function as external clock input or TIM2_CH1
7 PA1 bidirectional Port A pin 1, 5V tolerant input/output with analog capability for ADC1_IN6 or TIM2_CH2
8 PA2 bidirectional Port A pin 2, 5V tolerant input/output with analog capability for ADC1_IN7 or USART2_TX
9 PA3 bidirectional Port A pin 3, 3.6V tolerant input/output with analog capability for operational amplifier output OPAMP1_VOUT or ADC1_IN8
10 PA4 bidirectional Port A pin 4, 3.6V tolerant input/output with analog capability for DAC1_OUT1 or ADC1_IN9
11 PA5 bidirectional Port A pin 5, 3.6V tolerant input/output with analog capability for DAC1_OUT2 or ADC1_IN10
12 PA6 bidirectional Port A pin 6, 5V tolerant input/output with analog capability for ADC1_IN11 or TIM16_CH1
13 PA7 bidirectional Port A pin 7, 5V tolerant input/output with analog capability for ADC1_IN12, Fm+ capable
14 PB0 bidirectional Port B pin 0, 5V tolerant input/output with analog capability for ADC1_IN15
15 PB1 bidirectional Port B pin 1, 5V tolerant input/output with analog capability for ADC1_IN16
16 VSS power_in Ground (0V reference) for digital and analog circuits
17 VDD power_in Main power supply input, 1.71V to 3.6V range
18 PA8 bidirectional Port A pin 8, 5V tolerant input/output for MCO clock output or TIM1_CH1
19 PA9 bidirectional Port A pin 9, 5V tolerant input/output with Fm+ capability for USART1_TX or TIM1_CH2
20 PA10 bidirectional Port A pin 10, 5V tolerant input/output with Fm+ capability for USART1_RX or TIM1_CH3
21 PA11 bidirectional Port A pin 11, 5V tolerant input/output for CAN1_RX or TIM1_CH4
22 PA12 bidirectional Port A pin 12, 5V tolerant input/output for CAN1_TX or USART1_RTS_DE
23 PA13 bidirectional Port A pin 13, 5V tolerant input/output configured as JTAG TMS or Serial Wire Debug SWDIO after reset, internal pull-up resistor enabled
24 PA14 bidirectional Port A pin 14, 5V tolerant input/output configured as JTAG TCK or Serial Wire Debug SWCLK after reset, internal pull-down resistor enabled
25 PA15 bidirectional Port A pin 15, 5V tolerant input/output configured as JTAG TDI after reset, internal pull-up resistor enabled
26 PB3 bidirectional Port B pin 3, 5V tolerant input/output with analog capability configured as JTAG TDO or Serial Wire Debug trace after reset
27 PB4 bidirectional Port B pin 4, 5V tolerant input/output with Fm+ capability configured as JTAG NTRST after reset, internal pull-up resistor enabled
28 PB5 bidirectional Port B pin 5, 5V tolerant input/output for LPTIM1_IN1 or SPI1_MOSI
29 PB6 bidirectional Port B pin 6, 5V tolerant input/output with Fm+ capability for USART1_TX or I2C1_SCL
30 PB7 bidirectional Port B pin 7, 5V tolerant input/output with Fm+ capability for USART1_RX or I2C1_SDA
31 PH3/BOOT0 bidirectional Port H pin 3, 5V tolerant input/output, functions as BOOT0 for boot mode selection between Flash and system memory
32 VSS power_in Ground (0V reference) for digital and analog circuits
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: STM32L431KCU6TR
  • Footprint: Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm
  • 3D model: UFQFPN-32(5x5) (KiCad packages3D, STEP)
  • 3D model files: stm32l431kcu6tr-etched.step / stm32l431kcu6tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l431kcu6tr.step / stm32l431kcu6tr.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 2026-10-06, 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