STM32F303RBT6 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 supply pin for RTC, LSE oscillator and backup registers (1.65-3.6 V) when VDD is removed.
2	PC13	bidirectional	General-purpose I/O (TC, 3.3 V). Backup-domain pin; supplied through the power switch, output limited to 3 mA / 2 MHz / 30 pF. Alt: TIM1_CH1N. Add'l: WKUP2, RTC_TAMP1, RTC_TS, RTC_OUT.
3	PC14/OSC32_IN	bidirectional	GPIO PC14 (TC, 3.3 V) or LSE 32.768 kHz crystal input (OSC32_IN). Backup-domain, output current limited.
4	PC15/OSC32_OUT	bidirectional	GPIO PC15 (TC, 3.3 V) or LSE 32.768 kHz crystal output (OSC32_OUT). Backup-domain, output current limited.
5	PF0/OSC_IN	bidirectional	GPIO PF0 (FTf, 5 V-tolerant, FM+ capable) or HSE 4-32 MHz crystal input (OSC_IN). Alt: TIM1_CH3N, I2C2_SDA.
6	PF1/OSC_OUT	bidirectional	GPIO PF1 (FTf, 5 V-tolerant, FM+ capable) or HSE 4-32 MHz crystal output (OSC_OUT). Alt: I2C2_SCL.
7	NRST	bidirectional	Device reset input / open-drain internal reset output, active low. Embedded weak pull-up.
8	PC0	bidirectional	GPIO (TTa, 3.3 V tolerant, direct to ADC). Add'l: ADC12_IN6, COMP7_INM. Alt: EVENTOUT.
9	PC1	bidirectional	GPIO (TTa). Add'l: ADC12_IN7, COMP7_INP. Alt: EVENTOUT.
10	PC2	bidirectional	GPIO (TTa). Add'l: ADC12_IN8. Alt: COMP7_OUT, EVENTOUT.
11	PC3	bidirectional	GPIO (TTa). Add'l: ADC12_IN9. Alt: TIM1_BKIN2, EVENTOUT.
12	VSSA/VREF-	power_in	Analog ground and negative ADC/DAC reference. On the LQFP64, VREF- is bonded to VSSA.
13	VDDA/VREF+	power_in	Analog supply and positive ADC/DAC/OPAMP/COMP reference (2.0-3.6 V). On the LQFP64, VREF+ is internally connected to VDDA.
14	PA0	bidirectional	GPIO (TTa). Alt: USART2_CTS, TIM2_CH1_ETR, TIM8_BKIN, TIM8_ETR, TSC_G1_IO1, COMP1_OUT, EVENTOUT. Add'l: ADC1_IN1, COMP1_INM, RTC_TAMP2, WKUP1, COMP7_INP.
15	PA1	bidirectional	GPIO (TTa). Alt: USART2_RTS_DE, TIM2_CH2, TSC_G1_IO2, TIM15_CH1N, RTC_REFIN, EVENTOUT. Add'l: ADC1_IN2, COMP1_INP, OPAMP1_VINP, OPAMP3_VINP.
16	PA2	bidirectional	GPIO (TTa, fast ADC channel, reduced touch sensitivity). Alt: USART2_TX, TIM2_CH3, TIM15_CH1, TSC_G1_IO3, COMP2_OUT, EVENTOUT. Add'l: ADC1_IN3, COMP2_INM, OPAMP1_VOUT.
17	PA3	bidirectional	GPIO (TTa, fast ADC channel). Alt: USART2_RX, TIM2_CH4, TIM15_CH2, TSC_G1_IO4, EVENTOUT. Add'l: ADC1_IN4, OPAMP1_VINP, COMP2_INP, OPAMP1_VINM.
18	PF4	bidirectional	GPIO (TTa, fast ADC channel). Alt: COMP1_OUT, EVENTOUT. Add'l: ADC1_IN5.
19	VSS	power_in	Digital ground.
20	PA4	bidirectional	GPIO (TTa, fast ADC channel, reduced touch sensitivity). Alt: SPI1_NSS, SPI3_NSS/I2S3_WS, USART2_CK, TSC_G2_IO1, TIM3_CH2, EVENTOUT. Add'l: ADC2_IN1, DAC1_OUT1, OPAMP4_VINP, COMP1/2/3/4/5/6/7_INM.
21	PA5	bidirectional	GPIO (TTa, fast ADC channel, reduced touch sensitivity). Alt: SPI1_SCK, TIM2_CH1_ETR, TSC_G2_IO2, EVENTOUT. Add'l: ADC2_IN2, DAC1_OUT2, OPAMP1/2/3_VINP, COMP1/2/3/4/5/6/7_INM.
22	PA6	bidirectional	GPIO (TTa, fast ADC channel). Alt: SPI1_MISO, TIM3_CH1, TIM8_BKIN, TIM1_BKIN, TIM16_CH1, COMP1_OUT, TSC_G2_IO3, EVENTOUT. Add'l: ADC2_IN3, OPAMP2_VOUT.
23	PA7	bidirectional	GPIO (TTa). Alt: SPI1_MOSI, TIM3_CH2, TIM17_CH1, TIM1_CH1N, TIM8_CH1N, TSC_G2_IO4, COMP2_OUT, EVENTOUT. Add'l: ADC2_IN4, COMP2_INP, OPAMP2_VINP, OPAMP1_VINP.
24	PC4	bidirectional	GPIO (TTa, fast ADC channel). Alt: USART1_TX, EVENTOUT. Add'l: ADC2_IN5.
25	PC5	bidirectional	GPIO (TTa). Alt: USART1_RX, TSC_G3_IO1, EVENTOUT. Add'l: ADC2_IN11, OPAMP2_VINM, OPAMP1_VINM.
26	PB0	bidirectional	GPIO (TTa). Alt: TIM3_CH3, TIM1_CH2N, TIM8_CH2N, TSC_G3_IO2, EVENTOUT. Add'l: ADC3_IN12, COMP4_INP, OPAMP3_VINP, OPAMP2_VINP.
27	PB1	bidirectional	GPIO (TTa, fast ADC channel, reduced touch sensitivity). Alt: TIM3_CH4, TIM1_CH3N, TIM8_CH3N, COMP4_OUT, TSC_G3_IO3, EVENTOUT. Add'l: ADC3_IN1, OPAMP3_VOUT.
28	PB2	bidirectional	GPIO (TTa). Alt: TSC_G3_IO4, EVENTOUT. Add'l: ADC2_IN12, COMP4_INM, OPAMP3_VINM.
29	PB10	bidirectional	GPIO (TTa). Alt: USART3_TX, TIM2_CH3, TSC_SYNC, EVENTOUT. Add'l: COMP5_INM, OPAMP4_VINM, OPAMP3_VINM.
30	PB11	bidirectional	GPIO (TTa). Alt: USART3_RX, TIM2_CH4, TSC_G6_IO1, EVENTOUT. Add'l: COMP6_INP, OPAMP4_VINP.
31	VSS	power_in	Digital ground.
32	VDD	power_in	Digital power supply (2.0-3.6 V).
33	PB12	bidirectional	GPIO (TTa, fast ADC channel, reduced touch sensitivity). Alt: SPI2_NSS/I2S2_WS, I2C2_SMBA, USART3_CK, TIM1_BKIN, TSC_G6_IO2, EVENTOUT. Add'l: ADC4_IN3, COMP3_INM, OPAMP4_VOUT.
34	PB13	bidirectional	GPIO (TTa, fast ADC channel). Alt: SPI2_SCK/I2S2_CK, USART3_CTS, TIM1_CH1N, TSC_G6_IO3, EVENTOUT. Add'l: ADC3_IN5, COMP5_INP, OPAMP4_VINP, OPAMP3_VINP.
35	PB14	bidirectional	GPIO (TTa, fast ADC channel). Alt: SPI2_MISO/I2S2ext_SD, USART3_RTS_DE, TIM1_CH2N, TIM15_CH1, TSC_G6_IO4, EVENTOUT. Add'l: COMP3_INP, ADC4_IN4, OPAMP2_VINP.
36	PB15	bidirectional	GPIO (TTa, fast ADC channel). Alt: SPI2_MOSI/I2S2_SD, TIM1_CH3N, RTC_REFIN, TIM15_CH1N, TIM15_CH2, EVENTOUT. Add'l: ADC4_IN5, COMP6_INM.
37	PC6	bidirectional	GPIO (FT, 5 V-tolerant). Alt: I2S2_MCK, COMP6_OUT, TIM8_CH1, TIM3_CH1, EVENTOUT.
38	PC7	bidirectional	GPIO (FT). Alt: I2S3_MCK, TIM8_CH2, TIM3_CH2, COMP5_OUT, EVENTOUT.
39	PC8	bidirectional	GPIO (FT). Alt: TIM8_CH3, TIM3_CH3, COMP3_OUT, EVENTOUT.
40	PC9	bidirectional	GPIO (FT). Alt: TIM8_CH4, TIM8_BKIN2, TIM3_CH4, I2S_CKIN, EVENTOUT.
41	PA8	bidirectional	GPIO (FT). Alt: I2C2_SMBA, I2S2_MCK, USART1_CK, TIM1_CH1, TIM4_ETR, MCO (main clock output), COMP3_OUT, EVENTOUT.
42	PA9	bidirectional	GPIO (FTf, 5 V-tolerant, FM+ capable). Alt: I2C2_SCL, I2S3_MCK, USART1_TX, TIM1_CH2, TIM2_CH3, TIM15_BKIN, TSC_G4_IO1, COMP5_OUT, EVENTOUT.
43	PA10	bidirectional	GPIO (FTf). Alt: I2C2_SDA, USART1_RX, TIM1_CH3, TIM2_CH4, TIM8_BKIN, TIM17_BKIN, TSC_G4_IO2, COMP6_OUT, EVENTOUT.
44	PA11	bidirectional	GPIO (FT). Alt: USART1_CTS, USB_DM (USB 2.0 FS D-), CAN_RX, TIM1_CH1N, TIM1_CH4, TIM1_BKIN2, TIM4_CH1, COMP1_OUT, EVENTOUT.
45	PA12	bidirectional	GPIO (FT). Alt: USART1_RTS_DE, USB_DP (USB 2.0 FS D+), CAN_TX, TIM1_CH2N, TIM1_ETR, TIM4_CH2, TIM16_CH1, COMP2_OUT, EVENTOUT.
46	PA13	bidirectional	GPIO (FT). Default after reset: SWDIO-JTMS (SWD data / JTAG TMS). Alt: USART3_CTS, TIM4_CH3, TIM16_CH1N, TSC_G4_IO3, IR_OUT, SWDIO-JTMS, EVENTOUT.
47	VSS	power_in	Digital ground.
48	VDD	power_in	Digital power supply (2.0-3.6 V).
49	PA14	bidirectional	GPIO (FTf). Default after reset: SWCLK-JTCK. Alt: I2C1_SDA, USART2_TX, TIM8_CH2, TIM1_BKIN, TSC_G4_IO4, SWCLK-JTCK, EVENTOUT.
50	PA15	bidirectional	GPIO (FTf). Default after reset: JTDI. Alt: I2C1_SCL, SPI1_NSS, SPI3_NSS/I2S3_WS, JTDI, USART2_RX, TIM1_BKIN, TIM2_CH1_ETR, TIM8_CH1, EVENTOUT.
51	PC10	bidirectional	GPIO (FT). Alt: SPI3_SCK, I2S3_CK, USART3_TX, UART4_TX, TIM8_CH1N, EVENTOUT.
52	PC11	bidirectional	GPIO (FT). Alt: SPI3_MISO, I2S3ext_SD, USART3_RX, UART4_RX, TIM8_CH2N, EVENTOUT.
53	PC12	bidirectional	GPIO (FT). Alt: SPI3_MOSI, I2S3_SD, USART3_CK, UART5_TX, TIM8_CH3N, EVENTOUT.
54	PD2	bidirectional	GPIO (FT). Alt: UART5_RX, TIM3_ETR, TIM8_BKIN, EVENTOUT.
55	PB3	bidirectional	GPIO (FT). Default after reset: JTDO-TRACESWO. Alt: SPI3_SCK, I2S3_CK, SPI1_SCK, USART2_TX, TIM2_CH2, TIM3_ETR, TIM4_ETR, TIM8_CH1N, TSC_G5_IO1, JTDO-TRACESWO, EVENTOUT.
56	PB4	bidirectional	GPIO (FT). Default after reset: NJTRST. Alt: SPI3_MISO, I2S3ext_SD, SPI1_MISO, USART2_RX, TIM3_CH1, TIM16_CH1, TIM17_BKIN, TIM8_CH2N, TSC_G5_IO2, NJTRST, EVENTOUT.
57	PB5	bidirectional	GPIO (FT). Alt: SPI3_MOSI, SPI1_MOSI, I2S3_SD, I2C1_SMBA, USART2_CK, TIM16_BKIN, TIM3_CH2, TIM8_CH3N, TIM17_CH1, EVENTOUT.
58	PB6	bidirectional	GPIO (FTf, 5 V-tolerant, FM+ capable). Alt: I2C1_SCL, USART1_TX, TIM16_CH1N, TIM4_CH1, TIM8_CH1, TSC_G5_IO3, TIM8_ETR, TIM8_BKIN2, EVENTOUT.
59	PB7	bidirectional	GPIO (FTf). Alt: I2C1_SDA, USART1_RX, TIM3_CH4, TIM4_CH2, TIM17_CH1N, TIM8_BKIN, TSC_G5_IO4, EVENTOUT.
60	BOOT0	input	Dedicated boot memory selection input sampled at reset (dedicated 'B' I/O structure).
61	PB8	bidirectional	GPIO (FTf). Alt: I2C1_SCL, CAN_RX, TIM16_CH1, TIM4_CH3, TIM8_CH2, TIM1_BKIN, TSC_SYNC, COMP1_OUT, EVENTOUT.
62	PB9	bidirectional	GPIO (FTf). Alt: I2C1_SDA, CAN_TX, TIM17_CH1, TIM4_CH4, TIM8_CH3, IR_OUT, COMP2_OUT, EVENTOUT.
63	VSS	power_in	Digital ground.
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.

STM32F303RBT6
STM32F303RBT6RCT6
STM32F303RBT6CBT6
STM32F303RBT6CCT6
STM32F303RBT6VBT6
STM32F303RBT6VCT6
STM32F303RBT6ZBY6
STM32F303RBT6ZCY6

CAD (KiCad official)

Symbol: STM32F303RBT6
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
`stm32f303rbt6.step`	847 KB	You want the bare part, or you mark your own boards.
`stm32f303rbt6-etched.step`	5.9 MB	You want the part with `STM32F303RBT6` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 1458 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 (148 pp, sha256 e7a65f330e8fc061, 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