STM32L010F4P6 from STMicroelectronics, in a TSSOP-20. 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	PB9-BOOT0	bidirectional	General-purpose I/O PB9 muxed with BOOT0 boot-mode selection input. After reset acts as BOOT0 to select boot memory; then remappable as PB9 GPIO. 5 V tolerant (FT).
2	PC14-OSC32_IN	bidirectional	GPIO PC14 muxed with 32 kHz LSE crystal oscillator input (OSC32_IN). 5 V tolerant (FT). Additional function selected via RCC registers.
3	PC15-OSC32_OUT	bidirectional	GPIO PC15 muxed with 32 kHz LSE crystal oscillator output (OSC32_OUT). Standard 3.3 V I/O (TC).
4	NRST	bidirectional	Device reset input / internal open-drain reset output. Active low. Internal pull-up.
5	VDDA	power_in	Analog power supply for ADC and internal voltage reference. 1.8 V to 3.6 V.
6	PA0-CK_IN	bidirectional	GPIO PA0 with 3.3 V ADC-connected I/O (TTa). Alternate functions: USART2_RX, LPTIM1_IN1, TIM2_CH1/ETR, USART2_CTS, LPUART1_RX. Additional: ADC_IN0, RTC_TAMP2/WKUP1/CK_IN.
7	PA1	bidirectional	GPIO PA1, 5 V tolerant (FT). Alternate: EVENTOUT, LPTIM1_IN2, TIM2_CH2, I2C1_SMBA, USART2_RTS, TIM21_ETR, LPUART1_TX. Additional: ADC_IN1.
8	PA2	bidirectional	GPIO PA2, 3.3 V ADC-connected I/O (TTa). Alternate: TIM21_CH1, TIM2_CH3, USART2_TX, LPUART1_TX. Additional: ADC_IN2, RTC_TAMP3/RTC_TS/RTC_OUT/WKUP3.
9	PA3	bidirectional	GPIO PA3, 5 V tolerant (FT). Alternate: TIM21_CH2, TIM2_CH4, USART2_RX, LPUART1_RX. Additional: ADC_IN3.
10	PA4	bidirectional	GPIO PA4, 3.3 V ADC-connected I/O (TTa). Alternate: SPI1_NSS, LPTIM1_IN1/ETR, I2C1_SCL, USART2_CK, TIM2_ETR, LPUART1_TX. Additional: ADC_IN4.
11	PA5	bidirectional	GPIO PA5, 3.3 V ADC-connected I/O (TTa). Alternate: SPI1_SCK, LPTIM1_IN2, TIM2_ETR, TIM2_CH1. Additional: ADC_IN5.
12	PA6	bidirectional	GPIO PA6, 5 V tolerant (FT). Alternate: SPI1_MISO, LPTIM1_ETR, LPUART1_CTS, EVENTOUT. Additional: ADC_IN6.
13	PA7	bidirectional	GPIO PA7, 5 V tolerant (FT). Alternate: SPI1_MOSI, LPTIM1_OUT, USART2_CTS, TIM21_ETR, EVENTOUT. Additional: ADC_IN7.
14	PB1	bidirectional	GPIO PB1, 5 V tolerant (FT). Alternate: USART2_CK, SPI1_MOSI, LPTIM1_IN1, LPUART1_RTS, TIM2_CH4. Additional: ADC_IN9, VREF_OUT.
15	VSS	power_in	Digital and analog ground reference.
16	VDD	power_in	Digital power supply. 1.8 V to 3.6 V.
17	PA9	bidirectional	GPIO PA9, 5 V tolerant (FT). Alternate: MCO, I2C1_SCL, LPTIM1_OUT, USART2_TX, TIM21_CH2.
18	PA10	bidirectional	GPIO PA10, 5 V tolerant (FT). Alternate: TIM21_CH1, I2C1_SDA, RTC_REFIN, USART2_RX, TIM2_CH3.
19	PA13	bidirectional	GPIO PA13, 5 V tolerant (FT). Default alternate SWDIO (serial-wire debug data). Also LPTIM1_ETR, I2C1_SDA, SPI1_SCK, LPUART1_RX.
20	PA14	bidirectional	GPIO PA14, 5 V tolerant (FT). Default alternate SWCLK (serial-wire debug clock). Also LPTIM1_OUT, I2C1_SMBA, USART2_TX, SPI1_MISO, LPUART1_TX.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	TSSOP-20
Category	MCU
Pins	20

Ordering variants

Same part, different packaging or reel option.

STM32L010F4P6
STM32L010F4P6K4T6

CAD (KiCad official)

Symbol: STM32L010F4P6
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`stm32l010f4p6.step`	267 KB	You want the bare part, or you mark your own boards.
`stm32l010f4p6-etched.step`	3.2 MB	You want the part with `STM32L010F4P6` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 795 faces against 327 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: STMicroelectronics datasheet (91 pp, sha256 726f3aaf6245710a, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF