STM32F051R8T6 from STMicroelectronics, in a LQFP-64(10x10). 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	VBAT	power_in	Backup power supply pin (1.65-3.6 V). Provides power to RTC and backup registers when VDD is off.
2	PC13	bidirectional	General-purpose I/O (TC, standard 3.3 V). Additional functions: RTC_TAMP1, RTC_TS, RTC_OUT, WKUP2. Supplied via backup power switch (3 mA limit).
3	PC14-OSC32_IN	bidirectional	GPIO PC14 or 32.768 kHz LSE crystal oscillator input (OSC32_IN). Standard 3.3 V I/O with limited drive via backup switch.
4	PC15-OSC32_OUT	bidirectional	GPIO PC15 or 32.768 kHz LSE crystal oscillator output (OSC32_OUT). Standard 3.3 V I/O with limited drive via backup switch.
5	PF0-OSC_IN	bidirectional	GPIO PF0 or HSE 4-32 MHz crystal oscillator input (OSC_IN). 5 V tolerant (FT).
6	PF1-OSC_OUT	bidirectional	GPIO PF1 or HSE crystal oscillator output (OSC_OUT). 5 V tolerant (FT).
7	NRST	bidirectional	Bidirectional device reset pin, active low. Embedded weak pull-up resistor.
8	PC0	bidirectional	GPIO (TTa, 3.3 V, connected to ADC). Alt: EVENTOUT. Additional: ADC_IN10.
9	PC1	bidirectional	GPIO (TTa). Alt: EVENTOUT. Additional: ADC_IN11.
10	PC2	bidirectional	GPIO (TTa). Alt: EVENTOUT. Additional: ADC_IN12.
11	PC3	bidirectional	GPIO (TTa). Alt: EVENTOUT. Additional: ADC_IN13.
12	VSSA	power_in	Analog ground reference for ADC/DAC/comparator subsystem.
13	VDDA	power_in	Analog power supply (2.4-3.6 V) for ADC/DAC/comparator subsystem.
14	PA0	bidirectional	GPIO (TTa). Alt: USART2_CTS, TIM2_CH1_ETR, COMP1_OUT, TSC_G1_IO1. Additional: ADC_IN0, COMP1_INM6, RTC_TAMP2, WKUP1.
15	PA1	bidirectional	GPIO (TTa). Alt: USART2_RTS, TIM2_CH2, TSC_G1_IO2, EVENTOUT. Additional: ADC_IN1, COMP1_INP.
16	PA2	bidirectional	GPIO (TTa). Alt: USART2_TX, TIM2_CH3, TIM15_CH1, COMP2_OUT, TSC_G1_IO3. Additional: ADC_IN2, COMP2_INM6.
17	PA3	bidirectional	GPIO (TTa). Alt: USART2_RX, TIM2_CH4, TIM15_CH2, TSC_G1_IO4. Additional: ADC_IN3, COMP2_INP.
18	PF4	bidirectional	GPIO (FT, 5 V tolerant). Alt: EVENTOUT.
19	PF5	bidirectional	GPIO (FT, 5 V tolerant). Alt: EVENTOUT.
20	PA4	bidirectional	GPIO (TTa). Alt: SPI1_NSS/I2S1_WS, USART2_CK, TIM14_CH1, TSC_G2_IO1. Additional: ADC_IN4, COMP1_INM4, COMP2_INM4, DAC1_OUT.
21	PA5	bidirectional	GPIO (TTa). Alt: SPI1_SCK/I2S1_CK, CEC, TIM2_CH1_ETR, TSC_G2_IO2. Additional: ADC_IN5, COMP1_INM5, COMP2_INM5.
22	PA6	bidirectional	GPIO (TTa). Alt: SPI1_MISO/I2S1_MCK, TIM3_CH1, TIM1_BKIN, TIM16_CH1, COMP1_OUT, TSC_G2_IO3, EVENTOUT. Additional: ADC_IN6.
23	PA7	bidirectional	GPIO (TTa). Alt: SPI1_MOSI/I2S1_SD, TIM3_CH2, TIM14_CH1, TIM1_CH1N, TIM17_CH1, COMP2_OUT, TSC_G2_IO4, EVENTOUT. Additional: ADC_IN7.
24	PC4	bidirectional	GPIO (TTa). Alt: EVENTOUT. Additional: ADC_IN14.
25	PC5	bidirectional	GPIO (TTa). Alt: TSC_G3_IO1. Additional: ADC_IN15.
26	PB0	bidirectional	GPIO (TTa). Alt: TIM3_CH3, TIM1_CH2N, TSC_G3_IO2, EVENTOUT. Additional: ADC_IN8.
27	PB1	bidirectional	GPIO (TTa). Alt: TIM3_CH4, TIM14_CH1, TIM1_CH3N, TSC_G3_IO3. Additional: ADC_IN9.
28	PB2	bidirectional	GPIO (FT). Alt: TSC_G3_IO4.
29	PB10	bidirectional	GPIO (FT). Alt: I2C2_SCL, CEC, TIM2_CH3, TSC_SYNC.
30	PB11	bidirectional	GPIO (FT). Alt: I2C2_SDA, TIM2_CH4, TSC_G6_IO1, EVENTOUT.
31	VSS	power_in	Digital ground reference.
32	VDD	power_in	Digital power supply (2.0-3.6 V).
33	PB12	bidirectional	GPIO (FT). Alt: SPI2_NSS, TIM1_BKIN, TSC_G6_IO2, EVENTOUT.
34	PB13	bidirectional	GPIO (FT). Alt: SPI2_SCK, TIM1_CH1N, TSC_G6_IO3.
35	PB14	bidirectional	GPIO (FT). Alt: SPI2_MISO, TIM1_CH2N, TIM15_CH1, TSC_G6_IO4.
36	PB15	bidirectional	GPIO (FT). Alt: SPI2_MOSI, TIM1_CH3N, TIM15_CH1N, TIM15_CH2. Additional: RTC_REFIN.
37	PC6	bidirectional	GPIO (FT). Alt: TIM3_CH1.
38	PC7	bidirectional	GPIO (FT). Alt: TIM3_CH2.
39	PC8	bidirectional	GPIO (FT). Alt: TIM3_CH3.
40	PC9	bidirectional	GPIO (FT). Alt: TIM3_CH4.
41	PA8	bidirectional	GPIO (FT). Alt: USART1_CK, TIM1_CH1, EVENTOUT, MCO.
42	PA9	bidirectional	GPIO (FT). Alt: USART1_TX, TIM1_CH2, TIM15_BKIN, TSC_G4_IO1.
43	PA10	bidirectional	GPIO (FT). Alt: USART1_RX, TIM1_CH3, TIM17_BKIN, TSC_G4_IO2.
44	PA11	bidirectional	GPIO (FT). Alt: USART1_CTS, TIM1_CH4, COMP1_OUT, TSC_G4_IO3, EVENTOUT.
45	PA12	bidirectional	GPIO (FT). Alt: USART1_RTS, TIM1_ETR, COMP2_OUT, TSC_G4_IO4, EVENTOUT.
46	PA13	bidirectional	GPIO / SWDAT after reset (FT). Alt: IR_OUT, SWDAT. Internal pull-up active on SWDAT after reset.
47	PF6	bidirectional	GPIO (FT). Alt: I2C2_SCL.
48	PF7	bidirectional	GPIO (FT). Alt: I2C2_SDA.
49	PA14	bidirectional	GPIO / SWCLK after reset (FT). Alt: USART2_TX, SWCLK. Internal pull-down active on SWCLK after reset.
50	PA15	bidirectional	GPIO (FT). Alt: SPI1_NSS/I2S1_WS, USART2_RX, TIM2_CH1_ETR, EVENTOUT.
51	PC10	bidirectional	GPIO (FT).
52	PC11	bidirectional	GPIO (FT).
53	PC12	bidirectional	GPIO (FT).
54	PD2	bidirectional	GPIO (FT). Alt: TIM3_ETR.
55	PB3	bidirectional	GPIO (FT). Alt: SPI1_SCK/I2S1_CK, TIM2_CH2, TSC_G5_IO1, EVENTOUT.
56	PB4	bidirectional	GPIO (FT). Alt: SPI1_MISO/I2S1_MCK, TIM3_CH1, TSC_G5_IO2, EVENTOUT.
57	PB5	bidirectional	GPIO (FT). Alt: SPI1_MOSI/I2S1_SD, I2C1_SMBA, TIM16_BKIN, TIM3_CH2.
58	PB6	bidirectional	GPIO (FTf, 5 V FM+ capable). Alt: I2C1_SCL, USART1_TX, TIM16_CH1N, TSC_G5_IO3.
59	PB7	bidirectional	GPIO (FTf). Alt: I2C1_SDA, USART1_RX, TIM17_CH1N, TSC_G5_IO4.
60	BOOT0	input	Boot memory selection input. Sampled at reset to choose the boot source (Flash / System memory / SRAM).
61	PB8	bidirectional	GPIO (FTf). Alt: I2C1_SCL, CEC, TIM16_CH1, TSC_SYNC.
62	PB9	bidirectional	GPIO (FTf). Alt: I2C1_SDA, IR_OUT, TIM17_CH1, EVENTOUT.
63	VSS	power_in	Digital ground reference.
64	VDD	power_in	Digital power supply (2.0-3.6 V).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	LQFP-64(10x10)
Category	MCU
Pins	64

Ordering variants

Same part, different packaging or reel option.

STM32F051R8T6
STM32F051R6T6
STM32F051R4T6
STM32F051C8T6
STM32F051C6T6
STM32F051C4T6
STM32F051K8T6
STM32F051K6T6
STM32F051K4T6
STM32F051K8U6
STM32F051K6U6
STM32F051K4U6

CAD (KiCad official)

Symbol: STM32F051R8T6
Footprint: Package_QFP:LQFP-64_10x10mm_P0.5mm
3D model: LQFP-64(10x10) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`stm32f051r8t6.step`	847 KB	You want the bare part, or you mark your own boards.
`stm32f051r8t6-etched.step`	5.8 MB	You want the part with `STM32F051R8T6` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 1422 faces against 995 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 (104 pp, sha256 ef78e33984ec5885, 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