STM32L011F4P6TR 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	input	Boot mode selection input (BOOT0) shared with GPIO PB9. Sampled at reset to choose boot memory (main Flash vs system bootloader). Input-only after boot (type B). 5 V tolerant, FM+ capable when used as PB9.
2	PC14-OSC32_IN	bidirectional	GPIO PC14 muxed with LSE 32.768 kHz crystal oscillator input (OSC32_IN). Selected via RCC. 5 V tolerant (FT) I/O.
3	PC15-OSC32_OUT	bidirectional	GPIO PC15 muxed with LSE 32.768 kHz crystal oscillator output (OSC32_OUT). Standard 3.3 V I/O (TC).
4	NRST	bidirectional	Bidirectional device reset (active low) with embedded weak pull-up resistor. Drive low to force system reset; also driven low by internal reset sources.
5	VDDA	power_in	Analog power supply (1.65-3.6 V). Feeds ADC, comparators, internal reference and reset block. Must be tied to VDD potential; typically decoupled with 100 nF + bulk capacitance.
6	PA0-CK_IN	bidirectional	GPIO PA0 with wake-up input CK_IN. 3.3 V tolerant analog-capable I/O (TTa). Alt functions: USART2_RX, LPTIM1_IN1, TIM2_CH1, USART2_CTS, TIM2_ETR, LPUART1_RX, COMP1_OUT. Additional: COMP1_INM, ADC_IN0, RTC_TAMP2/WKUP1/CK_IN.
7	PA1	bidirectional	GPIO PA1, 5 V tolerant (FT). Alt functions: EVENTOUT, LPTIM1_IN2, TIM2_CH2, I2C1_SMBA, USART2_RTS_DE, TIM21_ETR, LPUART1_TX. Additional analog: COMP1_INP, ADC_IN1.
8	PA2	bidirectional	GPIO PA2, 3.3 V tolerant analog-capable (TTa). Alt functions: TIM21_CH1, TIM2_CH3, USART2_TX, LPUART1_TX, COMP2_OUT. Additional: COMP2_INM, ADC_IN2, RTC_TAMP3/RTC_TS/RTC_OUT/WKUP3.
9	PA3	bidirectional	GPIO PA3, 5 V tolerant (FT). Alt functions: TIM21_CH2, TIM2_CH4, USART2_RX, LPUART1_RX. Additional analog: COMP2_INP, ADC_IN3.
10	PA4	bidirectional	GPIO PA4, 3.3 V tolerant analog-capable (TTa). Alt functions: SPI1_NSS, LPTIM1_IN1, LPTIM1_ETR, I2C1_SCL, USART2_CK, TIM2_ETR, LPUART1_TX, COMP2_OUT. Additional: COMP1_INM, COMP2_INM, ADC_IN4.
11	PA5	bidirectional	GPIO PA5, 3.3 V tolerant analog-capable (TTa). Alt functions: SPI1_SCK, LPTIM1_IN2, TIM2_ETR, TIM2_CH1. Additional analog: COMP1_INM, COMP2_INM, ADC_IN5.
12	PA6	bidirectional	GPIO PA6, 5 V tolerant (FT). Alt functions: SPI1_MISO, LPTIM1_ETR, LPUART1_CTS, EVENTOUT, COMP1_OUT. Additional analog: ADC_IN6.
13	PA7	bidirectional	GPIO PA7, 5 V tolerant (FT). Alt functions: SPI1_MOSI, LPTIM1_OUT, USART2_CTS, TIM21_ETR, EVENTOUT, COMP2_OUT. Additional analog: COMP2_INP, ADC_IN7.
14	PB1	bidirectional	GPIO PB1, 5 V tolerant (FT). Alt functions: USART2_CK, SPI1_MOSI, LPTIM1_IN1, LPUART1_RTS_DE, TIM2_CH4. Additional analog: ADC_IN9, VREF_OUT.
15	VSS	power_in	Digital and analog ground return. Tie directly to system ground plane together with pin 16 VDD's decoupling network.
16	VDD	power_in	Digital power supply, 1.65-3.6 V. Decouple with 100 nF close to the pin plus 1-4.7 µF bulk. VDDA must be tied to the same rail.
17	PA9	bidirectional	GPIO PA9, 5 V tolerant FM+ capable (FTf). Alt functions: MCO, I2C1_SCL, LPTIM1_OUT, USART2_TX, TIM21_CH2, COMP1_OUT.
18	PA10	bidirectional	GPIO PA10, 5 V tolerant FM+ capable (FTf). Alt functions: TIM21_CH1, I2C1_SDA, RTC_REFIN, USART2_RX, TIM2_CH3, COMP1_OUT.
19	PA13	bidirectional	GPIO PA13 doubling as SWDIO debug pin (default after reset). 5 V tolerant FM+ capable (FTf). Alt functions: SWDIO, LPTIM1_ETR, I2C1_SDA, SPI1_SCK, LPUART1_RX, COMP1_OUT.
20	PA14	bidirectional	GPIO PA14 doubling as SWCLK debug pin (default after reset). 5 V tolerant (FT). Alt functions: SWCLK, LPTIM1_OUT, I2C1_SMBA, USART2_TX, SPI1_MISO, LPUART1_TX, COMP2_OUT.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

STM32L011F4P6TR
STM32L011F4P6TRF3P6
STM32L011F4P6TRF3P6TR
STM32L011F4P6TRD4P6
STM32L011F4P6TRD4P6TR
STM32L011F4P6TRD3P6
STM32L011F4P6TRD3P6TR
STM32L011F4P6TRG4U6
STM32L011F4P6TRG4U6TR
STM32L011F4P6TRG3U6
STM32L011F4P6TRG3U6TR
STM32L011F4P6TRK4T6
STM32L011F4P6TRK4T6TR
STM32L011F4P6TRK3T6
STM32L011F4P6TRK3T6TR
STM32L011F4P6TRE4Y6
STM32L011F4P6TRE4Y6TR
STM32L011F4P6TRE3Y6
STM32L011F4P6TRE3Y6TR

CAD (KiCad official)

Symbol: STM32L011F4P6TR
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
`stm32l011f4p6tr.step`	267 KB	You want the bare part, or you mark your own boards.
`stm32l011f4p6tr-etched.step`	3.3 MB	You want the part with `STM32L011F4P6TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 834 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 (119 pp, sha256 1271aa38a181c7a2, 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