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STM32L071K8U3

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

STM32L071K8U3 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	PC14-OSC32_IN	input	32 kHz oscillator input pin for RTC operation, 5V tolerant I/O with alternate functions for SPI, USART, LPTIM, TIM2, TIM3, EVENTOUT.
2	PC15-OSC32_OUT	output	32 kHz oscillator output pin for RTC operation, standard 3.3V I/O with alternate functions for OSC32_OUT.
3	NRST	bidirectional	Bidirectional reset pin with embedded weak pull-up resistor for system reset control.
4	VSSA	power_in	Ground reference pin for analog circuits and ADC.
5	VDDA	power_in	Analog power supply pin (1.65V to 3.6V) for ADC and comparators.
6	PA0	bidirectional	5V-tolerant I/O pin on Port A with analog input ADC_IN0 and alternate functions for TIM2, USART2, COMP1.
7	PA1	bidirectional	5V-tolerant I/O pin on Port A with analog input ADC_IN1 and alternate functions for TIM2, TIM21, USART2, COMP1.
8	PA2	bidirectional	5V-tolerant I/O pin on Port A with analog input ADC_IN2 and alternate functions for TIM2, TIM21, USART2, LPUART1, COMP2.
9	PA3	bidirectional	5V-tolerant I/O pin on Port A with analog input ADC_IN3 and alternate functions for TIM2, TIM21, USART2, LPUART1, COMP2.
10	PA4	bidirectional	Standard 3.3V I/O pin on Port A with analog input ADC_IN4 and alternate functions for SPI1, USART2, TIM22.
11	PA5	bidirectional	Standard 3.3V I/O pin on Port A with analog input ADC_IN5 and alternate functions for SPI1, TIM2, COMP.
12	PA6	bidirectional	5V-tolerant I/O pin on Port A with analog input ADC_IN6 and alternate functions for SPI1, TIM3, TIM22, COMP1, LPUART1.
13	PA7	bidirectional	5V-tolerant I/O pin on Port A with analog input ADC_IN7 and alternate functions for SPI1, TIM3, TIM22, COMP2.
14	PB0	bidirectional	5V-tolerant I/O pin on Port B with analog input ADC_IN8 and alternate functions for TIM3, COMP, VREF_OUT.
15	PB1	bidirectional	5V-tolerant I/O pin on Port B with analog input ADC_IN9 and alternate functions for TIM3, LPUART1, COMP, VREF_OUT.
16	VSS	power_in	Ground reference pin for digital circuits and I/O.
17	VDD	power_in	Main power supply pin (1.65V to 3.6V) for digital circuits.
18	PA8	bidirectional	5V-tolerant Fast Mode+ capable I/O pin with alternate functions for MCO, USART1, I2C3.
19	PA9	bidirectional	5V-tolerant Fast Mode+ capable I/O pin with alternate functions for MCO, USART1, I2C1, I2C3.
20	PA10	bidirectional	5V-tolerant Fast Mode+ capable I/O pin with alternate functions for USART1, I2C1.
21	PA11	bidirectional	5V-tolerant I/O pin supplied by VDDIO2 with alternate functions for SPI1, USART1, COMP1.
22	PA12	bidirectional	5V-tolerant I/O pin supplied by VDDIO2 with alternate functions for SPI1, USART1, COMP2.
23	PA13	bidirectional	5V-tolerant I/O pin with alternate functions for SWDIO debug, LPUART1 receiver.
24	VDDIO2	power_in	Separate power supply pin (1.65V to 3.6V) for PA11 and PA12 I/O buffers.
25	PA14	bidirectional	5V-tolerant I/O pin with alternate functions for SWCLK debug, USART2, LPUART1.
26	PB4	bidirectional	5V-tolerant Fast Mode+ capable I/O pin with alternate functions for SPI1, TIM3, TIM22, USART1, USART5, I2C3, COMP2.
27	PB5	bidirectional	5V-tolerant I/O pin with alternate functions for SPI1, LPTIM1, I2C1, TIM3, TIM22, USART1, USART5, COMP2.
28	PB6	bidirectional	5V-tolerant Fast Mode+ capable I/O pin with alternate functions for USART1, I2C1, LPTIM1, COMP2.
29	PB7	bidirectional	5V-tolerant Fast Mode+ capable I/O pin with alternate functions for USART1, I2C1, LPTIM1, USART4, COMP2, VREF_PVD_IN.
30	BOOT0	input	Dedicated boot mode selection pin for choosing between boot from main flash memory or system bootloader.
31	VSS	power_in	Ground reference pin for digital circuits and I/O.
32	VDD	power_in	Main power supply pin (1.65V to 3.6V) for digital 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: STM32L071K8U3
Footprint: Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm
3D model: UFQFPN-32(5x5) (KiCad packages3D, STEP)
3D model files: stm32l071k8u3-etched.step / stm32l071k8u3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l071k8u3.step / stm32l071k8u3.glb are the bare package body.

Provenance

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

Datasheet: STMicroelectronics datasheet (148 pp, sha256 f413c7ce36b98e6c, retrieved 2026-10-07, 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