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STM32L051C8T6

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by Ray

STMicroelectronics Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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STM32L051C8T6

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · LQFP-48(7x7)

STM32L051C8T6 from STMicroelectronics, in a LQFP-48(7x7). 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 VDD power_in Digital core supply, 1.65 V to 3.6 V. Decouple with 100 nF close to the pin and share a bulk cap with other VDD pins.
2 PC13 bidirectional General-purpose 5V-tolerant I/O (FT). Additional functions: RTC_TAMP1, RTC_TS, RTC_OUT, WKUP2. Powered by VDD.
3 PC14-OSC32_IN bidirectional 5V-tolerant I/O; also LSE 32.768 kHz crystal oscillator input (OSC32_IN). Configure as LSE input when using the RTC crystal.
4 PC15-OSC32_OUT bidirectional Standard 3.3 V I/O (TC); also LSE 32.768 kHz crystal oscillator output (OSC32_OUT).
5 PH0-OSC_IN bidirectional Standard 3.3 V I/O (TC); also HSE main crystal oscillator input (OSC_IN, 1-25 MHz).
6 PH1-OSC_OUT bidirectional Standard 3.3 V I/O (TC); also HSE main crystal oscillator output (OSC_OUT).
7 NRST bidirectional Active-low bidirectional reset with internal weak pull-up. Drive low externally to force a system reset; the MCU also drives it low during internal resets.
8 VSSA power_in Analog ground reference for ADC and comparators. Tie to VSS at a single star point.
9 VDDA power_in Analog supply for ADC, comparators, and reset block. Same voltage as VDD (1.65 V-3.6 V); decouple with 1 µF + 10 nF.
10 PA0 bidirectional Standard 3.3 V I/O (TC). Alt funcs: TIM2_CH1, USART2_CTS, TIM2_ETR, COMP1_OUT. Additional: COMP1_INM6, ADC_IN0, RTC_TAMP2/WKUP1.
11 PA1 bidirectional 5V-tolerant I/O (FT). Alt funcs: EVENTOUT, TIM2_CH2, USART2_RTS_DE, TIM21_ETR. Additional: COMP1_INP, ADC_IN1.
12 PA2 bidirectional 5V-tolerant I/O (FT). Alt funcs: TIM21_CH1, TIM2_CH3, USART2_TX, COMP2_OUT. Additional: COMP2_INM6, ADC_IN2.
13 PA3 bidirectional 5V-tolerant I/O (FT). Alt funcs: TIM21_CH2, TIM2_CH4, USART2_RX. Additional: COMP2_INP, ADC_IN3.
14 PA4 bidirectional Standard 3.3 V I/O (TC). Alt funcs: SPI1_NSS, USART2_CK, TIM22_ETR. Additional: COMP1_INM4, COMP2_INM4, ADC_IN4.
15 PA5 bidirectional Standard 3.3 V I/O (TC). Alt funcs: SPI1_SCK, TIM2_ETR, TIM2_CH1. Additional: COMP1_INM5, COMP2_INM5, ADC_IN5.
16 PA6 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_MISO, LPUART1_CTS, TIM22_CH1, EVENTOUT, COMP1_OUT. Additional: ADC_IN6.
17 PA7 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_MOSI, TIM22_CH2, EVENTOUT, COMP2_OUT. Additional: ADC_IN7.
18 PB0 bidirectional 5V-tolerant I/O (FT). Alt funcs: EVENTOUT. Additional: ADC_IN8, VREF_OUT.
19 PB1 bidirectional 5V-tolerant I/O (FT). Alt funcs: LPUART1_RTS_DE. Additional: ADC_IN9, VREF_OUT.
20 PB2 bidirectional 5V-tolerant I/O (FT). Alt func: LPTIM1_OUT.
21 PB10 bidirectional 5V-tolerant I/O (FT). Alt funcs: TIM2_CH3, LPUART1_TX, SPI2_SCK, I2C2_SCL.
22 PB11 bidirectional 5V-tolerant I/O (FT). Alt funcs: EVENTOUT, TIM2_CH4, LPUART1_RX, I2C2_SDA.
23 VSS power_in Digital ground.
24 VDD power_in Digital core supply, 1.65 V to 3.6 V. Decouple with 100 nF close to the pin.
25 PB12 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI2_NSS/I2S2_WS, LPUART1_RTS_DE, EVENTOUT.
26 PB13 bidirectional 5V-tolerant, Fm+-capable I/O (FTf). Alt funcs: SPI2_SCK/I2S2_CK, LPUART1_CTS, I2C2_SCL, TIM21_CH1.
27 PB14 bidirectional 5V-tolerant, Fm+-capable I/O (FTf). Alt funcs: SPI2_MISO/I2S2_MCK, RTC_OUT, LPUART1_RTS_DE, I2C2_SDA, TIM21_CH2.
28 PB15 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI2_MOSI/I2S2_SD, RTC_REFIN.
29 PA8 bidirectional 5V-tolerant I/O (FT). Alt funcs: MCO, EVENTOUT, USART1_CK.
30 PA9 bidirectional 5V-tolerant I/O (FT). Alt funcs: MCO, USART1_TX.
31 PA10 bidirectional 5V-tolerant I/O (FT). Alt func: USART1_RX.
32 PA11 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_MISO, EVENTOUT, USART1_CTS, COMP1_OUT.
33 PA12 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_MOSI, EVENTOUT, USART1_RTS_DE, COMP2_OUT.
34 PA13 bidirectional 5V-tolerant I/O (FT). Serial-wire debug data (SWDIO) after reset - hold this pin free of drivers during programming.
35 VSS power_in Digital ground.
36 VDDIO2 power_in Independent I/O supply rail for the PC13/PH0/PH1/PC14/PC15 domain on other packages; on LQFP48 it powers the I/O ring segment associated with these pins. Same range as VDD (1.65 V-3.6 V) - typically tied to VDD.
37 PA14 bidirectional 5V-tolerant I/O (FT). Serial-wire debug clock (SWCLK) after reset. Alt func: USART2_TX.
38 PA15 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_NSS, TIM2_ETR, EVENTOUT, USART2_RX, TIM2_CH1.
39 PB3 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_SCK, TIM2_CH2, EVENTOUT. Additional: COMP2_INN.
40 PB4 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_MISO, EVENTOUT, TIM22_CH1. Additional: COMP2_INP.
41 PB5 bidirectional 5V-tolerant I/O (FT). Alt funcs: SPI1_MOSI, LPTIM1_IN1, I2C1_SMBA, TIM22_CH2. Additional: COMP2_INP.
42 PB6 bidirectional 5V-tolerant, Fm+-capable I/O (FTf). Alt funcs: USART1_TX, I2C1_SCL, LPTIM1_ETR. Additional: COMP2_INP.
43 PB7 bidirectional 5V-tolerant, Fm+-capable I/O (FTf). Alt funcs: USART1_RX, I2C1_SDA, LPTIM1_IN2. Additional: COMP2_INP, PVD_IN.
44 BOOT0 input Boot-mode select. Sampled at reset: 0 = boot from main Flash, 1 = boot from system-memory bootloader (USART/SPI) or embedded SRAM per BFB2/nBOOT1 option bytes.
45 PB8 bidirectional 5V-tolerant, Fm+-capable I/O (FTf). Alt func: I2C1_SCL.
46 PB9 bidirectional 5V-tolerant, Fm+-capable I/O (FTf). Alt funcs: EVENTOUT, I2C1_SDA, SPI2_NSS/I2S2_WS.
47 VSS power_in Digital ground.
48 VDD power_in Digital core supply, 1.65 V to 3.6 V. Decouple with 100 nF close to the pin.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package LQFP-48(7x7)
Category MCU
Pins 48

Ordering variants

Same part, different packaging or reel option.

  • STM32L051C8T6C6T6
  • STM32L051C8T6
  • STM32L051C8T6R6T6
  • STM32L051C8T6R8T6
  • STM32L051C8T6R6H6
  • STM32L051C8T6R8H6
  • STM32L051C8T6Y6TR
  • STM32L051C8T6Y8TR
  • STM32L051C8T6K6T6
  • STM32L051C8T6K8T6
  • STM32L051C8T6K6U6
  • STM32L051C8T6K8U6

CAD (KiCad official)

  • Symbol: STM32L051C8T6
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
stm32l051c8t6.step 617 KB You want the bare part, or you mark your own boards.
stm32l051c8t6-etched.step 4.8 MB You want the part with STM32L051C8T6 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 1187 faces against 747 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 (131 pp, sha256 457bab7943900413, 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