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STM32L051K8U6
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
markdownSTM32L051K8U6
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);stm32l051k8u6.step/stm32l051k8u6.glbare 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, 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).