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STM32L431CBT6

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STMicroelectronics Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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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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Contents

README

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STM32L431CBT6

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · LQFP-48(7x7)

STM32L431CBT6 from STMicroelectronics, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VBAT power_in Backup battery supply voltage pin, 1.55 to 3.6 V
2 PC13 bidirectional GPIO port C pin 13, 5 V tolerant, supports RTC tamper input 1, timestamp, output, and wakeup capability
3 PC14-OSC32_IN bidirectional GPIO port C pin 14, 5 V tolerant, 32 kHz oscillator input during normal operation
4 PC15-OSC32_OUT bidirectional GPIO port C pin 15, 5 V tolerant, 32 kHz oscillator output during normal operation
5 PH0-OSC_IN bidirectional GPIO port H pin 0, 5 V tolerant, main oscillator 4 to 48 MHz input
6 PH1-OSC_OUT bidirectional GPIO port H pin 1, 5 V tolerant, main oscillator 4 to 48 MHz output
7 NRST input System reset pin with embedded weak pull-up resistor for external reset input
8 VSSA/VREF- power_in Analog ground supply and negative reference voltage pin
9 VDDA/VREF+ power_in Analog power supply and positive reference voltage, 1.8 to 3.6 V for most functions, 2.4 to 3.6 V for VREFBUF
10 PA0 bidirectional GPIO port A pin 0, 5 V tolerant with analog switch, ADC1_IN5, supports timer and USART alternate functions
11 PA1 bidirectional GPIO port A pin 1, 5 V tolerant with analog switch, ADC1_IN6, supports timer and I2C alternate functions
12 PA2 bidirectional GPIO port A pin 2, 5 V tolerant with analog switch, ADC1_IN7, supports timer and USART alternate functions
13 PA3 bidirectional GPIO port A pin 3, 3.3 V tolerant with analog switch, ADC1_IN8, supports timer and USART alternate functions
14 PA4 bidirectional GPIO port A pin 4, 3.3 V tolerant with analog switch, ADC1_IN9, DAC1_OUT1
15 PA5 bidirectional GPIO port A pin 5, 3.3 V tolerant with analog switch, ADC1_IN10, DAC1_OUT2
16 PA6 bidirectional GPIO port A pin 6, 5 V tolerant with analog switch, ADC1_IN11, supports timer and comparator alternate functions
17 PA7 bidirectional GPIO port A pin 7, 5 V tolerant with analog switch and I2C Fm+ capable, ADC1_IN12
18 PB0 bidirectional GPIO port B pin 0, 5 V tolerant with analog switch, ADC1_IN15, supports timer alternate functions
19 PB1 bidirectional GPIO port B pin 1, 5 V tolerant with analog switch, ADC1_IN16, supports timer alternate functions
20 PB2 bidirectional GPIO port B pin 2, 5 V tolerant with analog switch, RTC_OUT and timer alternate functions
21 PB10 bidirectional GPIO port B pin 10, 5 V tolerant and I2C Fm+ capable, I2C2_SCL, supports timer and USART alternate functions
22 PB11 bidirectional GPIO port B pin 11, 5 V tolerant and I2C Fm+ capable, I2C2_SDA, supports timer and USART alternate functions
23 VSS power_in Ground supply pin, return path for supply current
24 VDD power_in Main power supply voltage pin, 1.71 to 3.6 V
25 PB12 bidirectional GPIO port B pin 12, 5 V tolerant, supports timer and USART alternate functions
26 PB13 bidirectional GPIO port B pin 13, 5 V tolerant and I2C Fm+ capable, I2C2_SCL, supports timer alternate functions
27 PB14 bidirectional GPIO port B pin 14, 5 V tolerant and I2C Fm+ capable, I2C2_SDA, supports timer alternate functions
28 PB15 bidirectional GPIO port B pin 15, 5 V tolerant, RTC_REFIN, supports timer alternate functions
29 PA8 bidirectional GPIO port A pin 8, 5 V tolerant, MCO master clock output, supports timer and USART alternate functions
30 PA9 bidirectional GPIO port A pin 9, 5 V tolerant and I2C Fm+ capable, I2C1_SCL, supports timer and USART alternate functions
31 PA10 bidirectional GPIO port A pin 10, 5 V tolerant and I2C Fm+ capable, I2C1_SDA, supports timer and USART alternate functions
32 PA11 bidirectional GPIO port A pin 11, 5 V tolerant, CAN1_RX, supports timer and SPI alternate functions
33 PA12 bidirectional GPIO port A pin 12, 5 V tolerant, CAN1_TX, supports timer and SPI alternate functions
34 PA13 bidirectional JTAG TMS/SWDIO debug pin, 5 V tolerant with internal pull-up, GPIO port A pin 13
35 VSS power_in Ground supply pin, return path for supply current
36 VDD power_in Main power supply voltage pin, 1.71 to 3.6 V
37 PA14 bidirectional JTAG TCK/SWCLK debug pin, 5 V tolerant with internal pull-down, GPIO port A pin 14
38 PA15 bidirectional JTAG DI debug pin, 5 V tolerant with internal pull-up, GPIO port A pin 15, supports timer and SPI alternate functions
39 PB3 bidirectional JTAG DO/TRACESWO debug pin, 5 V tolerant with analog switch, GPIO port B pin 3
40 PB4 bidirectional JTAG NTRST debug pin, 5 V tolerant with analog switch and I2C Fm+ capable, GPIO port B pin 4
41 PB5 bidirectional GPIO port B pin 5, 5 V tolerant, supports timer, I2C, and SPI alternate functions
42 PB6 bidirectional GPIO port B pin 6, 5 V tolerant with analog switch and I2C Fm+ capable, I2C1_SCL, USART1_TX
43 PB7 bidirectional GPIO port B pin 7, 5 V tolerant with analog switch and I2C Fm+ capable, I2C1_SDA, USART1_RX
44 PH3/BOOT0 bidirectional GPIO port H pin 3 with BOOT0 function, 5 V tolerant, selects boot mode at device reset
45 PB8 bidirectional GPIO port B pin 8, 5 V tolerant and I2C Fm+ capable, I2C1_SCL, CAN1_RX, supports timer alternate functions
46 PB9 bidirectional GPIO port B pin 9, 5 V tolerant and I2C Fm+ capable, I2C1_SDA, CAN1_TX, supports timer alternate functions
47 VSS power_in Ground supply pin, return path for supply current
48 VDD power_in Main power supply voltage pin, 1.71 to 3.6 V

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package LQFP-48(7x7)
Category Embedded Processors & Controllers
Pins 48

CAD (KiCad official)

  • Symbol: STM32L431CBT6
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: stm32l431cbt6-etched.step / stm32l431cbt6-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l431cbt6.step / stm32l431cbt6.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 2026-09-23, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-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