# STM32F303ZET6

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · LQFP-144(20x20)

STM32F303ZET6 from STMicroelectronics, in a LQFP-144(20x20). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model, then checked against ST open pin data); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PE2 | bidirectional | 5 V tolerant I/O (FT); alternate functions TRACECK, EVENTOUT, TIM3_CH1, TSC_G7_IO1, SPI4_SCK, TIM20_CH1, FMC_A23. |
| 2 | PE3 | bidirectional | 5 V tolerant I/O (FT); alternate functions TRACED0, EVENTOUT, TIM3_CH2, TSC_G7_IO2, SPI4_NSS, TIM20_CH2, FMC_A19. |
| 3 | PE4 | bidirectional | 5 V tolerant I/O (FT); alternate functions TRACED1, EVENTOUT, TIM3_CH3, TSC_G7_IO3, SPI4_NSS, TIM20_CH1N, FMC_A20. |
| 4 | PE5 | bidirectional | 5 V tolerant I/O (FT); alternate functions TRACED2, EVENTOUT, TIM3_CH4, TSC_G7_IO4, SPI4_MISO, TIM20_CH2N, FMC_A21. |
| 5 | PE6 | bidirectional | 5 V tolerant I/O (FT); alternate functions TRACED3, EVENTOUT, SPI4_MOSI, TIM20_CH3N, FMC_A22; additional functions WKUP3, RTC_TAMP3. |
| 6 | VBAT | power_in | Backup power supply pin for the RTC and backup registers. |
| 7 | PC13 | bidirectional | Standard 3.3 V I/O (TC) supplied through the power switch, which sinks only 3 mA, so output speed must not exceed 2 MHz with a 30 pF load and the pin must not source current such as an LED; alternate functions EVENTOUT, TIM1_CH1N; additional functions WKUP2, RTC_TAMP1, RTC_TS, RTC_OUT. |
| 8 | PC14 | bidirectional | Standard 3.3 V I/O (TC) supplied through the power switch (3 mA limit), so output speed must not exceed 2 MHz with a 30 pF load and it must not be used as a current source; alternate function EVENTOUT; additional function OSC32_IN. |
| 9 | PC15 | bidirectional | Standard 3.3 V I/O (TC) supplied through the power switch (3 mA limit), so output speed must not exceed 2 MHz with a 30 pF load and it must not be used as a current source; alternate function EVENTOUT; additional function OSC32_OUT. |
| 10 | PH0 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH1, FMC_A0. |
| 11 | PH1 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH2, FMC_A1. |
| 12 | PF2 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM20_CH3, FMC_A2; additional function ADC12_IN10. |
| 13 | PF3 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH4, FMC_A3. |
| 14 | PF4 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, COMP1_OUT, TIM20_CH1N, FMC_A4; additional function ADC1_IN5 (fast ADC channel). |
| 15 | PF5 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH2N, FMC_A5. |
| 16 | VSS | power_in | Digital ground pin. |
| 17 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 18 | PF6 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions EVENTOUT, TIM4_CH4, I2C2_SCL, USART3_RTS, FMC_NIORD. |
| 19 | PF7 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_BKIN, FMC_NREG. |
| 20 | PF8 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_BKIN2, FMC_NIOWR. |
| 21 | PF9 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_BKIN, TIM15_CH1, SPI2_SCK, FMC_CD. |
| 22 | PF10 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_BKIN2, TIM15_CH2, SPI2_SCK, FMC_INTR. |
| 23 | PF0-OSC_IN | input | 5 V tolerant I/O with I2C FM+ option (FTf) listed as input; alternate functions EVENTOUT, I2C2_SDA, SPI2_NSS/I2S2_WS, TIM1_CH3N; additional function OSC_IN (external oscillator input). |
| 24 | PF1-OSC_OUT | output | 5 V tolerant I/O with I2C FM+ option (FTf) listed as output; alternate functions EVENTOUT, I2C2_SCL, SPI2_SCK/I2S2_CK; additional function OSC_OUT (external oscillator output). |
| 25 | NRST | bidirectional | Bidirectional reset pin with embedded weak pull-up resistor; device reset input and internal reset output, active low. |
| 26 | PC0 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH1; additional functions ADC12_IN6, COMP7_INM. |
| 27 | PC1 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH2; additional functions ADC12_IN7, COMP7_INP. |
| 28 | PC2 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH3, COMP7_OUT; additional function ADC12_IN8. |
| 29 | PC3 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH4, TIM1_BKIN2; additional function ADC12_IN9. |
| 30 | VSSA | power_in | Analog ground pin. |
| 31 | VREF- | power_in | Negative reference voltage pin for the ADC, which can be internally connected to VSSA depending on the package. |
| 32 | VREF+ | power_in | Positive reference voltage pin for the ADC; the ADC characteristics specify VREF+ from 2 V to VDDA. |
| 33 | VDDA | power_in | Analog supply pin; VDDA voltage range is 2.0 V to 3.6 V. |
| 34 | PA0 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM2_CH1/TIM2_ETR, TSC_G1_IO1, USART2_CTS, COMP1_OUT, TIM8_BKIN, TIM8_ETR, EVENTOUT; additional functions ADC1_IN1 (fast ADC channel), COMP1_INM, RTC_TAMP2, WKUP1. |
| 35 | PA1 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions RTC_REFIN, TIM2_CH2, TSC_G1_IO2, USART2_RTS, TIM15_CH1N, EVENTOUT; additional functions ADC1_IN2 (fast ADC channel), COMP1_INP, OPAMP1_VINP, OPAMP3_VINP. |
| 36 | PA2 | bidirectional | 3.3 V tolerant I/O (TTa) with reduced touch sensing sensitivity, recommended as sampling capacitor I/O; alternate functions TIM2_CH3, TSC_G1_IO3, USART2_TX, COMP2_OUT, TIM15_CH1, EVENTOUT; additional functions ADC1_IN3 (fast ADC channel), COMP2_INM, OPAMP1_VOUT. |
| 37 | PA3 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM2_CH4, TSC_G1_IO4, USART2_RX, TIM15_CH2, EVENTOUT; additional functions ADC1_IN4 (fast ADC channel), OPAMP1_VINM, OPAMP1_VINP. |
| 38 | VSS | power_in | Digital ground pin. |
| 39 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 40 | PA4 | bidirectional | 3.3 V tolerant I/O (TTa) with reduced touch sensing sensitivity, recommended as sampling capacitor I/O; alternate functions TIM3_CH2, TSC_G2_IO1, SPI1_NSS, SPI3_NSS/I2S3_WS, USART2_CK, EVENTOUT; additional functions ADC2_IN1 (fast ADC channel), DAC1_OUT1, COMP1_INM to COMP7_INM, OPAMP4_VINP. |
| 41 | PA5 | bidirectional | 3.3 V tolerant I/O (TTa) with reduced touch sensing sensitivity, recommended as sampling capacitor I/O; alternate functions TIM2_CH1/TIM2_ETR, TSC_G2_IO2, SPI1_SCK, EVENTOUT; additional functions ADC2_IN2 (fast ADC channel), DAC1_OUT2, COMP1_INM to COMP7_INM, OPAMP1_VINP, OPAMP2_VINM, OPAMP3_VINP. |
| 42 | PA6 | bidirectional | 3.3 V tolerant I/O (TTa) with reduced touch sensing sensitivity, recommended as sampling capacitor I/O; alternate functions TIM16_CH1, TIM3_CH1, TSC_G2_IO3, TIM8_BKIN, SPI1_MISO, TIM1_BKIN, COMP1_OUT, EVENTOUT; additional functions ADC2_IN3 (fast ADC channel), OPAMP2_VOUT. |
| 43 | PA7 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM17_CH1, TIM3_CH2, TSC_G2_IO4, TIM8_CH1N, SPI1_MOSI, TIM1_CH1N, EVENTOUT; additional functions ADC2_IN4 (fast ADC channel), COMP2_INP, OPAMP1_VINP, OPAMP2_VINP. |
| 44 | PC4 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_ETR, USART1_TX; additional function ADC2_IN5 (fast ADC channel). |
| 45 | PC5 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM15_BKIN, TSC_G3_IO1, USART1_RX; additional functions ADC2_IN11, OPAMP1_VINM, OPAMP2_VINM. |
| 46 | PB0 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM3_CH3, TSC_G3_IO2, TIM8_CH2N, TIM1_CH2N, EVENTOUT; additional functions ADC3_IN12, COMP4_INP, OPAMP2_VINP, OPAMP3_VINP. |
| 47 | PB1 | bidirectional | 3.3 V tolerant I/O (TTa) with reduced touch sensing sensitivity, recommended as sampling capacitor I/O; alternate functions TIM3_CH4, TSC_G3_IO3, TIM8_CH3N, TIM1_CH3N, COMP4_OUT, EVENTOUT; additional functions ADC3_IN1 (fast ADC channel), OPAMP3_VOUT. |
| 48 | PB2 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TSC_G3_IO4, EVENTOUT; additional functions ADC2_IN12, COMP4_INM, OPAMP3_VINM. |
| 49 | PF11 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_ETR. |
| 50 | PF12 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH1, FMC_A6. |
| 51 | VSS | power_in | Digital ground pin. |
| 52 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 53 | PF13 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH2, FMC_A7. |
| 54 | PF14 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH3, FMC_A8. |
| 55 | PF15 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH4, FMC_A9. |
| 56 | PG0 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH1N, FMC_A10. |
| 57 | PG1 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH2N, FMC_A11. |
| 58 | PE7 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_ETR, FMC_D4; additional function ADC3_IN13. |
| 59 | PE8 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH1N, FMC_D5; additional functions ADC34_IN6, COMP4_INM. |
| 60 | PE9 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH1, FMC_D6; additional function ADC3_IN2 (fast ADC channel). |
| 61 | VSS | power_in | Digital ground pin. |
| 62 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 63 | PE10 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH2N, FMC_D7; additional function ADC3_IN14. |
| 64 | PE11 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH2, SPI4_NSS, FMC_D8; additional function ADC3_IN15. |
| 65 | PE12 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH3N, SPI4_SCK, FMC_D9; additional function ADC3_IN16. |
| 66 | PE13 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH3, SPI4_MISO, FMC_D10; additional function ADC3_IN3 (fast ADC channel). |
| 67 | PE14 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_CH4, SPI4_MOSI, TIM1_BKIN2, FMC_D11; additional function ADC4_IN1 (fast ADC channel). |
| 68 | PE15 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM1_BKIN, USART3_RX, FMC_D12; additional function ADC4_IN2 (fast ADC channel). |
| 69 | PB10 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM2_CH3, TSC_SYNC, USART3_TX, EVENTOUT; additional functions COMP5_INM, OPAMP3_VINM, OPAMP4_VINM. |
| 70 | PB11 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM2_CH4, TSC_G6_IO1, USART3_RX, EVENTOUT; additional functions ADC12_IN14, COMP6_INP, OPAMP4_VINP. |
| 71 | VSS | power_in | Digital ground pin. |
| 72 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 73 | PB12 | bidirectional | 3.3 V tolerant I/O (TTa) with reduced touch sensing sensitivity, recommended as sampling capacitor I/O; alternate functions TSC_G6_IO2, I2C2_SMBAL, SPI2_NSS/I2S2_WS, TIM1_BKIN, USART3_CK, EVENTOUT; additional functions ADC4_IN3 (fast ADC channel), COMP3_INM, OPAMP4_VOUT. |
| 74 | PB13 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TSC_G6_IO3, SPI2_SCK/I2S2_CK, TIM1_CH1N, USART3_CTS, EVENTOUT; additional functions ADC3_IN5 (fast ADC channel), COMP5_INP, OPAMP3_VINP, OPAMP4_VINP. |
| 75 | PB14 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions TIM15_CH1, TSC_G6_IO4, SPI2_MISO/I2S2ext_SD, TIM1_CH2N, USART3_RTS, EVENTOUT; additional functions ADC4_IN4 (fast ADC channel), COMP3_INP, OPAMP2_VINP. |
| 76 | PB15 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions RTC_REFIN, TIM15_CH2, TIM15_CH1N, TIM1_CH3N, SPI2_MOSI/I2S2_SD, EVENTOUT; additional functions ADC4_IN5 (fast ADC channel), COMP6_INM. |
| 77 | PD8 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, USART3_TX, FMC_D13; additional functions ADC4_IN12, OPAMP4_VINM. |
| 78 | PD9 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, USART3_RX, FMC_D14; additional function ADC4_IN13. |
| 79 | PD10 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, USART3_CK, FMC_D15; additional functions ADC34_IN7, COMP6_INM. |
| 80 | PD11 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, USART3_CTS, FMC_A16; additional functions ADC34_IN8, OPAMP4_VINP. |
| 81 | PD12 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM4_CH1, TSC_G8_IO1, USART3_RTS, FMC_A17; additional function ADC34_IN9. |
| 82 | PD13 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM4_CH2, TSC_G8_IO2, FMC_A18; additional functions ADC34_IN10, COMP5_INM. |
| 83 | VSS | power_in | Digital ground pin. |
| 84 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 85 | PD14 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM4_CH3, TSC_G8_IO3, FMC_D0; additional functions ADC34_IN11, OPAMP2_VINP. |
| 86 | PD15 | bidirectional | 3.3 V tolerant I/O (TTa); alternate functions EVENTOUT, TIM4_CH4, TSC_G8_IO4, SPI2_NSS, FMC_D1; additional function COMP3_INM. |
| 87 | PG2 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_CH3N, FMC_A12. |
| 88 | PG3 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_BKIN, FMC_A13. |
| 89 | PG4 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_BKIN2, FMC_A14. |
| 90 | PG5 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM20_ETR, FMC_A15. |
| 91 | PG6 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_INT2. |
| 92 | PG7 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_INT3. |
| 93 | PG8 | bidirectional | 5 V tolerant I/O (FT); alternate function EVENTOUT. |
| 94 | VSS | power_in | Digital ground pin. |
| 95 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 96 | PC6 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM3_CH1, TIM8_CH1, I2S2_MCK, COMP6_OUT. |
| 97 | PC7 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM3_CH2, TIM8_CH2, I2S3_MCK, COMP5_OUT. |
| 98 | PC8 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM3_CH3, TIM8_CH3, COMP3_OUT. |
| 99 | PC9 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions EVENTOUT, TIM3_CH4, I2C3_SDA, TIM8_CH4, I2SCKIN, TIM8_BKIN2. |
| 100 | PA8 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions MCO, I2C3_SCL, I2C2_SMBAL, I2S2_MCK, TIM1_CH1, USART1_CK, COMP3_OUT, TIM4_ETR, EVENTOUT. |
| 101 | PA9 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions I2C3_SMBAL, TSC_G4_IO1, I2C2_SCL, I2S3_MCK, TIM1_CH2, USART1_TX, COMP5_OUT, TIM15_BKIN, TIM2_CH3, EVENTOUT. |
| 102 | PA10 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions TIM17_BKIN, TSC_G4_IO2, I2C2_SDA, SPI2_MISO/I2S2ext_SD, TIM1_CH3, USART1_RX, COMP6_OUT, TIM2_CH4, TIM8_BKIN, EVENTOUT. |
| 103 | PA11 | bidirectional | 5 V tolerant I/O (FT); alternate functions SPI2_MOSI/I2S2_SD, TIM1_CH1N, USART1_CTS, COMP1_OUT, CAN_RX, TIM4_CH1, TIM1_CH4, TIM1_BKIN2, EVENTOUT; additional function USB_DM. |
| 104 | PA12 | bidirectional | 5 V tolerant I/O (FT); alternate functions TIM16_CH1, I2SCKIN, TIM1_CH2N, USART1_RTS, COMP2_OUT, CAN_TX, TIM4_CH2, TIM1_ETR, EVENTOUT; additional function USB_DP. |
| 105 | PA13 | bidirectional | 5 V tolerant I/O (FT); alternate functions SWDIO-JTMS, TIM16_CH1N, TSC_G4_IO3, IR-OUT, USART3_CTS, TIM4_CH3, EVENTOUT. |
| 106 | PH2 | bidirectional | 5 V tolerant I/O (FT); alternate function EVENTOUT. |
| 107 | VSS | power_in | Digital ground pin. |
| 108 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 109 | PA14 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions SWCLK-JTCK, TSC_G4_IO4, I2C1_SDA, TIM8_CH2, TIM1_BKIN, USART2_TX, EVENTOUT. |
| 110 | PA15 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions JTDI, TIM2_CH1/TIM2_ETR, TIM8_CH1, TSC_SYNC, I2C1_SCL, SPI1_NSS, SPI3_NSS/I2S3_WS, USART2_RX, TIM1_BKIN, EVENTOUT. |
| 111 | PC10 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM8_CH1N, UART4_TX, SPI3_SCK/I2S3_CK, USART3_TX. |
| 112 | PC11 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM8_CH2N, UART4_RX, SPI3_MISO/I2S3ext_SD, USART3_RX. |
| 113 | PC12 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM8_CH3N, UART5_TX, SPI3_MOSI/I2S3_SD, USART3_CK. |
| 114 | PD0 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, CAN_RX, FMC_D2. |
| 115 | PD1 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM8_CH4, TIM8_BKIN2, CAN_TX, FMC_D3. |
| 116 | PD2 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM3_ETR, TIM8_BKIN, UART5_RX. |
| 117 | PD3 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM2_CH1/TIM2_ETR, USART2_CTS, FMC_CLK. |
| 118 | PD4 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM2_CH2, USART2_RTS, FMC_NOE. |
| 119 | PD5 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, USART2_TX, FMC_NWE. |
| 120 | VSS | power_in | Digital ground pin. |
| 121 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 122 | PD6 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM2_CH4, USART2_RX, FMC_NWAIT. |
| 123 | PD7 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM2_CH3, USART2_CK, FMC_NE1/FMC_NCE2. |
| 124 | PG9 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_NE2/FMC_NCE3. |
| 125 | PG10 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_NCE4_1/FMC_NE3. |
| 126 | PG11 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_NCE4_2. |
| 127 | PG12 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_NE4. |
| 128 | PG13 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_A24. |
| 129 | PG14 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, FMC_A25. |
| 130 | VSS | power_in | Digital ground pin. |
| 131 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |
| 132 | PG15 | bidirectional | 5 V tolerant I/O (FT); alternate function EVENTOUT. |
| 133 | PB3 | bidirectional | 5 V tolerant I/O (FT); alternate functions JTDO-TRACESWO, TIM2_CH2, TIM4_ETR, TSC_G5_IO1, TIM8_CH1N, SPI1_SCK, SPI3_SCK/I2S3_CK, USART2_TX, TIM3_ETR, EVENTOUT. |
| 134 | PB4 | bidirectional | 5 V tolerant I/O (FT); alternate functions JTRST, TIM16_CH1, TIM3_CH1, TSC_G5_IO2, TIM8_CH2N, SPI1_MISO, SPI3_MISO/I2S3ext_SD, USART2_RX, TIM17_BKIN, EVENTOUT. |
| 135 | PB5 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions TIM16_BKIN, TIM3_CH2, TIM8_CH3N, I2C1_SMBAl, SPI1_MOSI, SPI3_MOSI/I2S3_SD, USART2_CK, I2C3_SDA, TIM17_CH1, EVENTOUT. |
| 136 | PB6 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions TIM16_CH1N, TIM4_CH1, TSC_G5_IO3, I2C1_SCL, TIM8_CH1, TIM8_ETR, USART1_TX, TIM8_BKIN2, EVENTOUT. |
| 137 | PB7 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions TIM17_CH1N, TIM4_CH2, TSC_G5_IO4, I2C1_SDA, TIM8_BKIN, USART1_RX, TIM3_CH4, FMC_NADV, EVENTOUT. |
| 138 | BOOT0 | input | Dedicated BOOT0 pin used for boot mode selection; the datasheet table gives no I/O structure for it. |
| 139 | PB8 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions TIM16_CH1, TIM4_CH3, TSC_SYNC, I2C1_SCL, USART3_RX, COMP1_OUT, CAN_RX, TIM8_CH2, TIM1_BKIN, EVENTOUT. |
| 140 | PB9 | bidirectional | 5 V tolerant I/O with I2C FM+ option (FTf); alternate functions TIM17_CH1, TIM4_CH4, I2C1_SDA, IR-OUT, USART3_TX, COMP2_OUT, CAN_TX, TIM8_CH3, EVENTOUT. |
| 141 | PE0 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM4_ETR, TIM16_CH1, TIM20_ETR, USART1_TX, FMC_NBL0. |
| 142 | PE1 | bidirectional | 5 V tolerant I/O (FT); alternate functions EVENTOUT, TIM17_CH1, TIM20_CH4, USART1_RX, FMC_NBL1. |
| 143 | VSS | power_in | Digital ground pin. |
| 144 | VDD | power_in | Digital supply pin; VDD voltage range is 2.0 V to 3.6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | LQFP-144(20x20) |
| Category | Embedded Processors & Controllers |
| Pins | 144 |

## CAD (KiCad official)

- Symbol: `STM32F303ZET6`
- Footprint: `Package_QFP:LQFP-144_20x20mm_P0.5mm`
- 3D model: LQFP-144(20x20) (KiCad packages3D, STEP)
- 3D model files: `stm32f303zet6-etched.step` / `stm32f303zet6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32f303zet6.step` / `stm32f303zet6.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586180216440172544) (173 pp, sha256 `5009ea08fac5eb65`, retrieved 2026-10-11, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/stm32f303zet6-datasheet.pdf)