# STM32F103ZET6TR

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

STM32F103ZET6TR 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 | Port E bit 2, general-purpose I/O, 5V tolerant, alternate functions include ETM trace clock and FSMC address line A23. |
| 2 | PE3 | bidirectional | Port E bit 3, general-purpose I/O, 5V tolerant, alternate functions include ETM trace data 0 and FSMC address line A19. |
| 3 | PE4 | bidirectional | Port E bit 4, general-purpose I/O, 5V tolerant, alternate functions include ETM trace data 1 and FSMC address line A20. |
| 4 | PE5 | bidirectional | Port E bit 5, general-purpose I/O, 5V tolerant, alternate functions include ETM trace data 2 and FSMC address line A21. |
| 5 | PE6 | bidirectional | Port E bit 6, general-purpose I/O, 5V tolerant, alternate functions include ETM trace data 3 and FSMC address line A22. |
| 6 | VBAT | power_in | Backup power supply pin for RTC and backup registers, accepts 2.0 to 3.6 V. |
| 7 | PC13-TAMPER-RTC | bidirectional | Port C bit 13, backup domain I/O, alternate function TAMPER-RTC, limited to 2 MHz output speed with 30 pF load maximum. |
| 8 | PC14-OSC32_IN | bidirectional | Port C bit 14, backup domain I/O, alternate function OSC32_IN for 32 kHz crystal oscillator input. |
| 9 | PC15-OSC32_OUT | bidirectional | Port C bit 15, backup domain I/O, alternate function OSC32_OUT for 32 kHz crystal oscillator output. |
| 10 | PF0 | bidirectional | Port F bit 0, general-purpose I/O, 5V tolerant, alternate function FSMC_A0 for address line 0. |
| 11 | PF1 | bidirectional | Port F bit 1, general-purpose I/O, 5V tolerant, alternate function FSMC_A1 for address line 1. |
| 12 | PF2 | bidirectional | Port F bit 2, general-purpose I/O, 5V tolerant, alternate function FSMC_A2 for address line 2. |
| 13 | PF3 | bidirectional | Port F bit 3, general-purpose I/O, 5V tolerant, alternate function FSMC_A3 for address line 3. |
| 14 | PF4 | bidirectional | Port F bit 4, general-purpose I/O, 5V tolerant, alternate function FSMC_A4 for address line 4. |
| 15 | PF5 | bidirectional | Port F bit 5, general-purpose I/O, 5V tolerant, alternate function FSMC_A5 for address line 5. |
| 16 | VSS_5 | power_in | Ground supply pin, connect to system ground (0 V). |
| 17 | VDD_5 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 18 | PF6 | bidirectional | Port F bit 6, general-purpose I/O, alternate functions include ADC3_IN4 analog input and FSMC_NIORD control signal. |
| 19 | PF7 | bidirectional | Port F bit 7, general-purpose I/O, alternate functions include ADC3_IN5 analog input and FSMC_NREG control signal. |
| 20 | PF8 | bidirectional | Port F bit 8, general-purpose I/O, alternate functions include ADC3_IN6 analog input and FSMC_NIOWR control signal. |
| 21 | PF9 | bidirectional | Port F bit 9, general-purpose I/O, alternate functions include ADC3_IN7 analog input and FSMC_CD control signal. |
| 22 | PF10 | bidirectional | Port F bit 10, general-purpose I/O, alternate functions include ADC3_IN8 analog input and FSMC_INTR control signal. |
| 23 | OSC_IN | input | High-speed external oscillator input, accepts 4 to 16 MHz crystal oscillator signal. |
| 24 | OSC_OUT | output | High-speed external oscillator output, drives 4 to 16 MHz crystal oscillator load. |
| 25 | NRST | bidirectional | Reset pin, active low input for system reset or open-drain output for reset signaling. |
| 26 | PC0 | bidirectional | Port C bit 0, general-purpose I/O, alternate function ADC123_IN10 for analog-to-digital converter input. |
| 27 | PC1 | bidirectional | Port C bit 1, general-purpose I/O, alternate function ADC123_IN11 for analog-to-digital converter input. |
| 28 | PC2 | bidirectional | Port C bit 2, general-purpose I/O, alternate function ADC123_IN12 for analog-to-digital converter input. |
| 29 | PC3 | bidirectional | Port C bit 3, general-purpose I/O, alternate function ADC123_IN13 for analog-to-digital converter input. |
| 30 | VSSA | power_in | Analog ground reference pin, connect to system ground for ADC and DAC operation. |
| 31 | VREF- | power_in | ADC negative reference voltage pin, typically connected to VSSA or ground, range 0 V. |
| 32 | VREF+ | power_in | ADC positive reference voltage pin, accepts 2.4 to 3.6 V, can be internally connected to VDDA. |
| 33 | VDDA | power_in | Analog power supply pin, accepts 2.4 to 3.6 V for ADC, DAC, and comparator operation. |
| 34 | PA0-WKUP | bidirectional | Port A bit 0, general-purpose I/O with wakeup capability, alternate functions include USART2_CTS, ADC123_IN0, and TIM2/TIM5/TIM8 timer inputs. |
| 35 | PA1 | bidirectional | Port A bit 1, general-purpose I/O, alternate functions include USART2_RTS, ADC123_IN1, and TIM2/TIM5 timer inputs. |
| 36 | PA2 | bidirectional | Port A bit 2, general-purpose I/O, alternate functions include USART2_TX, ADC123_IN2, and TIM2/TIM5 timer inputs. |
| 37 | PA3 | bidirectional | Port A bit 3, general-purpose I/O, alternate functions include USART2_RX, ADC123_IN3, and TIM2/TIM5 timer inputs. |
| 38 | VSS_4 | power_in | Ground supply pin, connect to system ground (0 V). |
| 39 | VDD_4 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 40 | PA4 | bidirectional | Port A bit 4, general-purpose I/O, alternate functions include SPI1_NSS, USART2_CK, DAC_OUT1, and ADC12_IN4 analog input. |
| 41 | PA5 | bidirectional | Port A bit 5, general-purpose I/O, alternate functions include SPI1_SCK, DAC_OUT2, and ADC12_IN5 analog input. |
| 42 | PA6 | bidirectional | Port A bit 6, general-purpose I/O, alternate functions include SPI1_MISO, TIM8_BKIN, ADC12_IN6, and TIM1/TIM3 timer functions. |
| 43 | PA7 | bidirectional | Port A bit 7, general-purpose I/O, alternate functions include SPI1_MOSI, TIM8_CH1N, ADC12_IN7, and TIM1/TIM3 timer functions. |
| 44 | PC4 | bidirectional | Port C bit 4, general-purpose I/O, alternate function ADC12_IN14 for analog-to-digital converter input. |
| 45 | PC5 | bidirectional | Port C bit 5, general-purpose I/O, alternate function ADC12_IN15 for analog-to-digital converter input. |
| 46 | PB0 | bidirectional | Port B bit 0, general-purpose I/O, alternate functions include ADC12_IN8 and TIM1/TIM3/TIM8 timer functions. |
| 47 | PB1 | bidirectional | Port B bit 1, general-purpose I/O, alternate functions include ADC12_IN9 and TIM1/TIM3/TIM8 timer functions. |
| 48 | PB2 | bidirectional | Port B bit 2, 5V tolerant general-purpose I/O, alternate function BOOT1 for boot mode selection. |
| 49 | PF11 | bidirectional | Port F bit 11, 5V tolerant general-purpose I/O, alternate function FSMC_NIOS16 for memory control signal. |
| 50 | PF12 | bidirectional | Port F bit 12, 5V tolerant general-purpose I/O, alternate function FSMC_A6 for address line 6. |
| 51 | VSS_6 | power_in | Ground supply pin, connect to system ground (0 V). |
| 52 | VDD_6 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 53 | PF13 | bidirectional | Port F bit 13, 5V tolerant general-purpose I/O, alternate function FSMC_A7 for address line 7. |
| 54 | PF14 | bidirectional | Port F bit 14, 5V tolerant general-purpose I/O, alternate function FSMC_A8 for address line 8. |
| 55 | PF15 | bidirectional | Port F bit 15, 5V tolerant general-purpose I/O, alternate function FSMC_A9 for address line 9. |
| 56 | PG0 | bidirectional | Port G bit 0, 5V tolerant general-purpose I/O, alternate function FSMC_A10 for address line 10. |
| 57 | PG1 | bidirectional | Port G bit 1, 5V tolerant general-purpose I/O, alternate function FSMC_A11 for address line 11. |
| 58 | PE7 | bidirectional | Port E bit 7, 5V tolerant general-purpose I/O, alternate functions include FSMC_D4 data line and TIM1_ETR timer input. |
| 59 | PE8 | bidirectional | Port E bit 8, 5V tolerant general-purpose I/O, alternate functions include FSMC_D5 data line and TIM1_CH1N timer output. |
| 60 | PE9 | bidirectional | Port E bit 9, 5V tolerant general-purpose I/O, alternate functions include FSMC_D6 data line and TIM1_CH1 timer output. |
| 61 | VSS_7 | power_in | Ground supply pin, connect to system ground (0 V). |
| 62 | VDD_7 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 63 | PE10 | bidirectional | Port E bit 10, 5V tolerant general-purpose I/O, alternate functions include FSMC_D7 data line and TIM1_CH2N timer output. |
| 64 | PE11 | bidirectional | Port E bit 11, 5V tolerant general-purpose I/O, alternate functions include FSMC_D8 data line and TIM1_CH2 timer output. |
| 65 | PE12 | bidirectional | Port E bit 12, 5V tolerant general-purpose I/O, alternate functions include FSMC_D9 data line and TIM1_CH3N timer output. |
| 66 | PE13 | bidirectional | Port E bit 13, 5V tolerant general-purpose I/O, alternate functions include FSMC_D10 data line and TIM1_CH3 timer output. |
| 67 | PE14 | bidirectional | Port E bit 14, 5V tolerant general-purpose I/O, alternate functions include FSMC_D11 data line and TIM1_CH4 timer output. |
| 68 | PE15 | bidirectional | Port E bit 15, 5V tolerant general-purpose I/O, alternate functions include FSMC_D12 data line and TIM1_BKIN brake input. |
| 69 | PB10 | bidirectional | Port B bit 10, 5V tolerant general-purpose I/O, alternate functions include I2C2_SCL, USART3_TX, and TIM2_CH3 timer output. |
| 70 | PB11 | bidirectional | Port B bit 11, 5V tolerant general-purpose I/O, alternate functions include I2C2_SDA, USART3_RX, and TIM2_CH4 timer output. |
| 71 | VSS_1 | power_in | Ground supply pin, connect to system ground (0 V). |
| 72 | VDD_1 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 73 | PB12 | bidirectional | Port B bit 12, 5V tolerant general-purpose I/O, alternate functions include SPI2_NSS, I2S2_WS, I2C2_SMBA, USART3_CK, and TIM1_BKIN. |
| 74 | PB13 | bidirectional | Port B bit 13, 5V tolerant general-purpose I/O, alternate functions include SPI2_SCK, I2S2_CK, USART3_CTS, and TIM1_CH1N. |
| 75 | PB14 | bidirectional | Port B bit 14, 5V tolerant general-purpose I/O, alternate functions include SPI2_MISO, TIM1_CH2N, and USART3_RTS. |
| 76 | PB15 | bidirectional | Port B bit 15, 5V tolerant general-purpose I/O, alternate functions include SPI2_MOSI, I2S2_SD, and TIM1_CH3N. |
| 77 | PD8 | bidirectional | Port D bit 8, 5V tolerant general-purpose I/O, alternate functions include FSMC_D13 data line and USART3_TX. |
| 78 | PD9 | bidirectional | Port D bit 9, 5V tolerant general-purpose I/O, alternate functions include FSMC_D14 data line and USART3_RX. |
| 79 | PD10 | bidirectional | Port D bit 10, 5V tolerant general-purpose I/O, alternate functions include FSMC_D15 data line and USART3_CK. |
| 80 | PD11 | bidirectional | Port D bit 11, 5V tolerant general-purpose I/O, alternate functions include FSMC_A16 address line and USART3_CTS. |
| 81 | PD12 | bidirectional | Port D bit 12, 5V tolerant general-purpose I/O, alternate functions include FSMC_A17 address line, TIM4_CH1 timer, and USART3_RTS. |
| 82 | PD13 | bidirectional | Port D bit 13, 5V tolerant general-purpose I/O, alternate functions include FSMC_A18 address line and TIM4_CH2 timer. |
| 83 | VSS_8 | power_in | Ground supply pin, connect to system ground (0 V). |
| 84 | VDD_8 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 85 | PD14 | bidirectional | Port D bit 14, 5V tolerant general-purpose I/O, alternate functions include FSMC_D0 data line and TIM4_CH3 timer output. |
| 86 | PD15 | bidirectional | Port D bit 15, 5V tolerant general-purpose I/O, alternate functions include FSMC_D1 data line and TIM4_CH4 timer output. |
| 87 | PG2 | bidirectional | Port G bit 2, 5V tolerant general-purpose I/O, alternate function FSMC_A12 for address line 12. |
| 88 | PG3 | bidirectional | Port G bit 3, 5V tolerant general-purpose I/O, alternate function FSMC_A13 for address line 13. |
| 89 | PG4 | bidirectional | Port G bit 4, 5V tolerant general-purpose I/O, alternate function FSMC_A14 for address line 14. |
| 90 | PG5 | bidirectional | Port G bit 5, 5V tolerant general-purpose I/O, alternate function FSMC_A15 for address line 15. |
| 91 | PG6 | bidirectional | Port G bit 6, 5V tolerant general-purpose I/O, alternate function FSMC_INT2 for interrupt signal. |
| 92 | PG7 | bidirectional | Port G bit 7, 5V tolerant general-purpose I/O, alternate function FSMC_INT3 for interrupt signal. |
| 93 | PG8 | bidirectional | Port G bit 8, 5V tolerant general-purpose I/O. |
| 94 | VSS_9 | power_in | Ground supply pin, connect to system ground (0 V). |
| 95 | VDD_9 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 96 | PC6 | bidirectional | Port C bit 6, 5V tolerant general-purpose I/O, alternate functions include I2S2_MCK, TIM8_CH1, SDIO_D6, and TIM3_CH1. |
| 97 | PC7 | bidirectional | Port C bit 7, 5V tolerant general-purpose I/O, alternate functions include I2S3_MCK, TIM8_CH2, SDIO_D7, and TIM3_CH2. |
| 98 | PC8 | bidirectional | Port C bit 8, 5V tolerant general-purpose I/O, alternate functions include TIM8_CH3, SDIO_D0, and TIM3_CH3. |
| 99 | PC9 | bidirectional | Port C bit 9, 5V tolerant general-purpose I/O, alternate functions include TIM8_CH4, SDIO_D1, and TIM3_CH4. |
| 100 | PA8 | bidirectional | Port A bit 8, 5V tolerant general-purpose I/O, alternate functions include USART1_CK, TIM1_CH1, and MCO master clock output. |
| 101 | PA9 | bidirectional | Port A bit 9, 5V tolerant general-purpose I/O, alternate functions include USART1_TX and TIM1_CH2 timer output. |
| 102 | PA10 | bidirectional | Port A bit 10, 5V tolerant general-purpose I/O, alternate functions include USART1_RX and TIM1_CH3 timer output. |
| 103 | PA11 | bidirectional | Port A bit 11, 5V tolerant general-purpose I/O, alternate functions include USART1_CTS, USB D- line, CAN_RX, and TIM1_CH4. |
| 104 | PA12 | bidirectional | Port A bit 12, 5V tolerant general-purpose I/O, alternate functions include USART1_RTS, USB D+ line, CAN_TX, and TIM1_ETR. |
| 105 | PA13 | bidirectional | Port A bit 13, 5V tolerant general-purpose I/O, alternate function JTMS-SWDIO for JTAG and SWD debug interface. |
| 106 | NC | unconnected | Not connected, no internal connection to chip. |
| 107 | VSS_2 | power_in | Ground supply pin, connect to system ground (0 V). |
| 108 | VDD_2 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 109 | PA14 | bidirectional | Port A bit 14, 5V tolerant general-purpose I/O, alternate function JTCK-SWCLK for JTAG and SWD debug interface. |
| 110 | PA15 | bidirectional | Port A bit 15, 5V tolerant general-purpose I/O, alternate functions include JTDI, SPI3_NSS, I2S3_WS, TIM2_CH1_ETR, and SPI1_NSS. |
| 111 | PC10 | bidirectional | Port C bit 10, 5V tolerant general-purpose I/O, alternate functions include UART4_TX, SDIO_D2, and USART3_TX. |
| 112 | PC11 | bidirectional | Port C bit 11, 5V tolerant general-purpose I/O, alternate functions include UART4_RX, SDIO_D3, and USART3_RX. |
| 113 | PC12 | bidirectional | Port C bit 12, 5V tolerant general-purpose I/O, alternate functions include UART5_TX, SDIO_CK, and USART3_CK. |
| 114 | PD0 | bidirectional | Port D bit 0, 5V tolerant general-purpose I/O, alternate functions include OSC_IN oscillator input, FSMC_D2 data line, and CAN_RX. |
| 115 | PD1 | bidirectional | Port D bit 1, 5V tolerant general-purpose I/O, alternate functions include OSC_OUT oscillator output, FSMC_D3 data line, and CAN_TX. |
| 116 | PD2 | bidirectional | Port D bit 2, 5V tolerant general-purpose I/O, alternate functions include TIM3_ETR, UART5_RX, and SDIO_CMD. |
| 117 | PD3 | bidirectional | Port D bit 3, 5V tolerant general-purpose I/O, alternate functions include FSMC_CLK memory clock and USART2_CTS. |
| 118 | PD4 | bidirectional | Port D bit 4, 5V tolerant general-purpose I/O, alternate functions include FSMC_NOE output enable and USART2_RTS. |
| 119 | PD5 | bidirectional | Port D bit 5, 5V tolerant general-purpose I/O, alternate functions include FSMC_NWE write enable and USART2_TX. |
| 120 | VSS_10 | power_in | Ground supply pin, connect to system ground (0 V). |
| 121 | VDD_10 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 122 | PD6 | bidirectional | Port D bit 6, 5V tolerant general-purpose I/O, alternate functions include FSMC_NWAIT wait signal and USART2_RX. |
| 123 | PD7 | bidirectional | Port D bit 7, 5V tolerant general-purpose I/O, alternate functions include FSMC_NE1 chip select and USART2_CK. |
| 124 | PG9 | bidirectional | Port G bit 9, 5V tolerant general-purpose I/O, alternate functions include FSMC_NE2 chip select and FSMC_NCE3. |
| 125 | PG10 | bidirectional | Port G bit 10, 5V tolerant general-purpose I/O, alternate functions include FSMC_NCE4_1 and FSMC_NE3 chip selects. |
| 126 | PG11 | bidirectional | Port G bit 11, 5V tolerant general-purpose I/O, alternate function FSMC_NCE4_2 for chip select. |
| 127 | PG12 | bidirectional | Port G bit 12, 5V tolerant general-purpose I/O, alternate function FSMC_NE4 for chip select. |
| 128 | PG13 | bidirectional | Port G bit 13, 5V tolerant general-purpose I/O, alternate function FSMC_A24 for address line 24. |
| 129 | PG14 | bidirectional | Port G bit 14, 5V tolerant general-purpose I/O, alternate function FSMC_A25 for address line 25. |
| 130 | VSS_11 | power_in | Ground supply pin, connect to system ground (0 V). |
| 131 | VDD_11 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |
| 132 | PG15 | bidirectional | Port G bit 15, 5V tolerant general-purpose I/O. |
| 133 | PB3 | bidirectional | Port B bit 3, 5V tolerant general-purpose I/O, alternate functions include JTDO, SPI3_SCK, I2S3_CK, TRACESWO, TIM2_CH2, and SPI1_SCK. |
| 134 | PB4 | bidirectional | Port B bit 4, 5V tolerant general-purpose I/O, alternate functions include NJTRST, SPI3_MISO, TIM3_CH1, and SPI1_MISO. |
| 135 | PB5 | bidirectional | Port B bit 5, general-purpose I/O, alternate functions include I2C1_SMBA, SPI3_MOSI, I2S3_SD, TIM3_CH2, and SPI1_MOSI. |
| 136 | PB6 | bidirectional | Port B bit 6, 5V tolerant general-purpose I/O, alternate functions include I2C1_SCL, TIM4_CH1, and USART1_TX. |
| 137 | PB7 | bidirectional | Port B bit 7, 5V tolerant general-purpose I/O, alternate functions include I2C1_SDA, FSMC_NADV address valid, TIM4_CH2, and USART1_RX. |
| 138 | BOOT0 | input | Boot mode selection pin, determines whether device boots from flash memory or system bootloader. |
| 139 | PB8 | bidirectional | Port B bit 8, 5V tolerant general-purpose I/O, alternate functions include TIM4_CH3, SDIO_D4, I2C1_SCL, and CAN_RX. |
| 140 | PB9 | bidirectional | Port B bit 9, 5V tolerant general-purpose I/O, alternate functions include TIM4_CH4, SDIO_D5, I2C1_SDA, and CAN_TX. |
| 141 | PE0 | bidirectional | Port E bit 0, 5V tolerant general-purpose I/O, alternate functions include TIM4_ETR and FSMC_NBL0 byte lane select. |
| 142 | PE1 | bidirectional | Port E bit 1, 5V tolerant general-purpose I/O, alternate function FSMC_NBL1 for byte lane select. |
| 143 | VSS_3 | power_in | Ground supply pin, connect to system ground (0 V). |
| 144 | VDD_3 | power_in | Main power supply pin, accepts 2.0 to 3.6 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STM32F103ZET6TR`
- Footprint: `Package_QFP:LQFP-144_20x20mm_P0.5mm`
- 3D model: LQFP-144(20x20) (KiCad packages3D, STEP)
- 3D model files: `stm32f103zet6tr-etched.step` / `stm32f103zet6tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32f103zet6tr.step` / `stm32f103zet6tr.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/8586182107576483840) (130 pp, sha256 `6cc345d224870bff`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/stm32f103zet6tr-datasheet.pdf)