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STM32L051K8U6

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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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STM32L051K8U6

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

STM32L051K8U6 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, +1.8V to +3.6V
2 PC14-OSC32_IN bidirectional Port C pin 14, OSC32_IN function for 32 kHz oscillator input
3 PC15-OSC32_OUT bidirectional Port C pin 15, OSC32_OUT function for 32 kHz oscillator output
4 NRST bidirectional Reset pin with internal pull-up and embedded filter
5 VDDA power_in Analog power supply, +1.65V to +3.6V
6 PA0 bidirectional Port A pin 0, can be used as TIM2_CH1, USART2_CTS, COMP1_INM6, or ADC_IN0
7 PA1 bidirectional Port A pin 1, can be used as TIM2_CH2, USART2_RTS_DE, COMP1_INP, or ADC_IN1
8 PA2 bidirectional Port A pin 2, can be used as TIM21_CH1, TIM2_CH3, USART2_TX, COMP2_INM6, or ADC_IN2
9 PA3 bidirectional Port A pin 3, can be used as TIM21_CH2, TIM2_CH4, USART2_RX, COMP2_INP, or ADC_IN3
10 PA4 bidirectional Port A pin 4, can be used as SPI1_NSS, USART2_CK, TIM22_ETR, COMP1_INM4, COMP2_INM4, or ADC_IN4
11 PA5 bidirectional Port A pin 5, can be used as SPI1_SCK, TIM2_ETR, TIM2_CH1, COMP1_INM5, COMP2_INM5, or ADC_IN5
12 PA6 bidirectional Port A pin 6, 5V tolerant, can be used as SPI1_MISO, LPUART1_CTS, TIM22_CH1, or ADC_IN6
13 PA7 bidirectional Port A pin 7, 5V tolerant, can be used as SPI1_MOSI, TIM22_CH2, or ADC_IN7
14 PB0 bidirectional Port B pin 0, 5V tolerant, can be used as ADC_IN8 or VREF_OUT
15 PB1 bidirectional Port B pin 1, 5V tolerant, can be used as LPUART1_RTS_DE, ADC_IN9, or VREF_OUT
16 PB2 bidirectional Port B pin 2, 5V tolerant, can be used as LPTIM1_OUT
17 VDD power_in Main power supply, +1.8V to +3.6V
18 PA8 bidirectional Port A pin 8, 5V tolerant, can be used as MCO or USART1_CK
19 PA9 bidirectional Port A pin 9, 5V tolerant, can be used as MCO or USART1_TX
20 PA10 bidirectional Port A pin 10, 5V tolerant, can be used as USART1_RX
21 PA11 bidirectional Port A pin 11, 5V tolerant, can be used as SPI1_MISO, USART1_CTS, or COMP1_OUT
22 PA12 bidirectional Port A pin 12, 5V tolerant, can be used as SPI1_MOSI, USART1_RTS_DE, or COMP2_OUT
23 PA13 bidirectional Port A pin 13, 5V tolerant, SWDIO function for serial wire debug
24 PA14 bidirectional Port A pin 14, 5V tolerant, can be used as SWCLK or USART2_TX
25 PA15 bidirectional Port A pin 15, 5V tolerant, can be used as SPI1_NSS, TIM2_ETR, USART2_RX, or TIM2_CH1
26 PB3 bidirectional Port B pin 3, 5V tolerant, can be used as SPI1_SCK, TIM2_CH2, with COMP2_INN function
27 PB4 bidirectional Port B pin 4, 5V tolerant, can be used as SPI1_MISO or TIM22_CH1, with COMP2_INP function
28 PB5 bidirectional Port B pin 5, 5V tolerant, can be used as SPI1_MOSI, LPTIM1_IN1, I2C1_SMBA, or TIM22_CH2, with COMP2_INP function
29 PB6 bidirectional Port B pin 6, Fast Mode+ capable, can be used as USART1_TX, I2C1_SCL, or LPTIM1_ETR, with COMP2_INP function
30 PB7 bidirectional Port B pin 7, Fast Mode+ capable, can be used as USART1_RX, I2C1_SDA, or LPTIM1_IN2, with COMP2_INP and PVD_IN functions
31 BOOT0 input Boot select pin for choosing boot from Flash, RAM, or System memory
32 PB8 bidirectional Port B pin 8, Fast Mode+ capable, can be used as I2C1_SCL
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: STM32L051K8U6
  • Footprint: Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm
  • 3D model: UFQFPN-32(5x5) (KiCad packages3D, STEP)
  • 3D model files: stm32l051k8u6-etched.step / stm32l051k8u6-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l051k8u6.step / stm32l051k8u6.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (131 pp, sha256 457bab7943900413, retrieved 2026-10-01, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, 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