STM32L431KBU6

{
  "schema_version": 1,
  "type": "component",
  "slug": "stm32l431kbu6",
  "title": "STM32L431KBU6",
  "brief": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "embedded processors & controllers",
    "stm32l431kbu6",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "STM32L431KBU6",
    "manufacturer": "STMicroelectronics",
    "package": "UFQFPN-32(5x5)",
    "pin_count": 33,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590222344049221632",
    "parts": {
      "symbol": "stm32l431kbu6.kicad_sym",
      "footprint": "stm32l431kbu6.kicad_mod",
      "model_3d": "stm32l431kbu6-etched.glb",
      "model_3d_plain": "stm32l431kbu6.glb",
      "model_3d_step": "stm32l431kbu6-etched.step",
      "model_3d_step_plain": "stm32l431kbu6.step",
      "lbr": "stm32l431kbu6.lbr"
    },
    "distributor_links": {
      "lcsc": "C2826408",
      "digikey": "497-18595-ND",
      "mouser": "511-STM32L431KBU6"
    },
    "distributor_check": {
      "checked_at": "2026-10-01T18:45:21Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-18595-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "511-STM32L431KBU6",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Main power supply, 1.71 to 3.6 V"
      },
      {
        "number": "2",
        "name": "PC14",
        "type": "bidirectional",
        "description": "Port C pin 14, 32 kHz oscillator input, EVENTOUT alternate function, OSC32_IN additional function"
      },
      {
        "number": "3",
        "name": "PC15",
        "type": "bidirectional",
        "description": "Port C pin 15, 32 kHz oscillator output, EVENTOUT alternate function, OSC32_OUT additional function"
      },
      {
        "number": "4",
        "name": "NRST",
        "type": "input",
        "description": "Bidirectional reset pin with embedded weak pull-up resistor"
      },
      {
        "number": "5",
        "name": "VDDA",
        "type": "power_in",
        "description": "Analog power supply and positive reference voltage for ADC, DAC, OPAMP, COMP, VREFBUF, 1.62 to 3.6 V when analog peripherals used"
      },
      {
        "number": "6",
        "name": "PA0",
        "type": "bidirectional",
        "description": "Port A pin 0, FT_a structure, TIM2_CH1, USART2_CTS, COMP1_OUT, SAI1_EXTCLK, ADC1_IN5, OPAMP1_VINP, RTC_TAMP2, WKUP1, CK_IN alternate/additional functions"
      },
      {
        "number": "7",
        "name": "PA1",
        "type": "bidirectional",
        "description": "Port A pin 1, FT_a structure, TIM2_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE, ADC1_IN6, OPAMP1_VINM, COMP1_INP alternate/additional functions"
      },
      {
        "number": "8",
        "name": "PA2",
        "type": "bidirectional",
        "description": "Port A pin 2, FT_a structure, TIM2_CH3, USART2_TX, LPUART1_TX, QUADSPI_BK1_NCS, ADC1_IN7, COMP2_OUT, TIM15_CH1 alternate/additional functions"
      },
      {
        "number": "9",
        "name": "PA3",
        "type": "bidirectional",
        "description": "Port A pin 3, TT structure, TIM2_CH4, USART2_RX, LPUART1_RX, QUADSPI_CLK, ADC1_IN8, OPAMP1_VOUT, COMP2_INP alternate/additional functions"
      },
      {
        "number": "10",
        "name": "PA4",
        "type": "bidirectional",
        "description": "Port A pin 4, TT structure, SPI1_NSS, SPI3_NSS, USART2_CK, ADC1_IN9, DAC1_OUT1, COMP1_INM, COMP2_INM alternate/additional functions"
      },
      {
        "number": "11",
        "name": "PA5",
        "type": "bidirectional",
        "description": "Port A pin 5, TT structure, TIM2_CH1, TIM2_ETR, SPI1_SCK, ADC1_IN10, DAC1_OUT2, COMP1_INM, COMP2_INM, LPTIM2_ETR alternate/additional functions"
      },
      {
        "number": "12",
        "name": "PA6",
        "type": "bidirectional",
        "description": "Port A pin 6, FT_a structure, TIM1_BKIN, SPI1_MISO, COMP1_OUT, USART3_CTS, ADC1_IN11, QUADSPI_BK1_IO3, TIM16_CH1 alternate/additional functions"
      },
      {
        "number": "13",
        "name": "PA7",
        "type": "bidirectional",
        "description": "Port A pin 7, FT_fa structure, TIM1_CH1N, I2C3_SCL, SPI1_MOSI, QUADSPI_BK1_IO2, ADC1_IN12, COMP2_OUT alternate/additional functions"
      },
      {
        "number": "14",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B pin 0, FT_a structure, TIM1_CH2N, SPI1_NSS, USART3_CK, QUADSPI_BK1_IO1, ADC1_IN15, COMP1_OUT, SAI1_EXTCLK alternate/additional functions"
      },
      {
        "number": "15",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B pin 1, FT_a structure, TIM1_CH3N, USART3_RTS_DE, LPUART1_RTS_DE, QUADSPI_BK1_IO0, ADC1_IN16, COMP1_INM, LPTIM2_IN1 alternate/additional functions"
      },
      {
        "number": "16",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin"
      },
      {
        "number": "17",
        "name": "VDD",
        "type": "power_in",
        "description": "Main power supply, 1.71 to 3.6 V"
      },
      {
        "number": "18",
        "name": "PA8",
        "type": "bidirectional",
        "description": "Port A pin 8, FT structure, MCO, TIM1_CH1, USART1_CK, SWPMI1_IO, SAI1_SCK_A, LPTIM2_OUT alternate functions"
      },
      {
        "number": "19",
        "name": "PA9",
        "type": "bidirectional",
        "description": "Port A pin 9, FT_f structure with Fm+ capability, TIM1_CH2, I2C1_SCL, USART1_TX, SAI1_FS_A, TIM15_BKIN alternate functions"
      },
      {
        "number": "20",
        "name": "PA10",
        "type": "bidirectional",
        "description": "Port A pin 10, FT_f structure with Fm+ capability, TIM1_CH3, I2C1_SDA, USART1_RX, SAI1_SD_A alternate functions"
      },
      {
        "number": "21",
        "name": "PA11",
        "type": "bidirectional",
        "description": "Port A pin 11, FT structure, TIM1_CH4, TIM1_BKIN2, SPI1_MISO, COMP1_OUT, USART1_CTS, CAN1_RX, TIM1_BKIN2_COMP1 alternate functions"
      },
      {
        "number": "22",
        "name": "PA12",
        "type": "bidirectional",
        "description": "Port A pin 12, FT structure, TIM1_ETR, SPI1_MOSI, USART1_RTS_DE, CAN1_TX alternate functions"
      },
      {
        "number": "23",
        "name": "PA13",
        "type": "bidirectional",
        "description": "Port A pin 13 / JTMS-SWDIO, after reset configured as JTAG debug port with internal pull-up, SWPMI1_TX, SAI1_SD_B, IR_OUT alternate functions"
      },
      {
        "number": "24",
        "name": "PA14",
        "type": "bidirectional",
        "description": "Port A pin 14 / JTCK-SWCLK, after reset configured as JTAG debug port with internal pull-down, LPTIM1_OUT, I2C1_SMBA, SWPMI1_RX, SAI1_FS_B alternate functions"
      },
      {
        "number": "25",
        "name": "PA15",
        "type": "bidirectional",
        "description": "Port A pin 15 / JTDI, after reset configured as JTAG input with internal pull-up, TIM2_CH1, TIM2_ETR, USART2_RX, SPI1_NSS, SPI3_NSS, USART3_RTS_DE, SWPMI1_SUSPEND alternate functions"
      },
      {
        "number": "26",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B pin 3 / JTDO-TRACESWO, after reset configured as JTAG output with FT_a structure, TIM2_CH2, SPI1_SCK, SPI3_SCK, USART1_RTS_DE, SAI1_SCK_B, COMP2_INM alternate/additional functions"
      },
      {
        "number": "27",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B pin 4 / NJTRST, after reset configured as JTAG input with FT_fa structure, I2C3_SDA, SPI1_MISO, SPI3_MISO, USART1_CTS, TSC_G2_IO1, SAI1_MCLK_B, COMP2_INP alternate/additional functions"
      },
      {
        "number": "28",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B pin 5, FT structure, LPTIM1_IN1, I2C1_SMBA, SPI1_MOSI, SPI3_MOSI, USART1_CK, TSC_G2_IO2, COMP2_OUT, SAI1_SD_B, TIM16_BKIN alternate functions"
      },
      {
        "number": "29",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Port B pin 6, FT_fa structure, LPTIM1_ETR, I2C1_SCL, USART1_TX, TSC_G2_IO3, SAI1_FS_B, TIM16_CH1N, COMP2_INP alternate functions"
      },
      {
        "number": "30",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Port B pin 7, FT_fa structure, LPTIM1_IN2, I2C1_SDA, USART1_RX, TSC_G2_IO4, COMP2_INM, PVD_IN alternate/additional functions"
      },
      {
        "number": "31",
        "name": "PH3",
        "type": "bidirectional",
        "description": "Port H pin 3 / BOOT0, selects boot mode between Flash memory and system bootloader on power-up or reset"
      },
      {
        "number": "32",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin"
      },
      {
        "number": "33",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin 1 VDD and Pin 17 VDD are both power supply pins; both are referenced in Table 15 on different pa; Pins 23, 24, 25, 26, 27 have JTAG/debug functionality that is active after reset with internal pull-; Pins 2, 3 have dual functionality as oscillator pins and GPIO; they are supplied through the power s",
          "2/33 pins cited to the wrong page (name found elsewhere): ['16:VSS@p67', '17:VDD@p67']"
        ],
        "pages_sent": 80,
        "cost_usd": 0.5611,
        "at": "2026-10-01T18:45:03"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590222344049221632",
        "pages": 208,
        "sha256": "71963de3cb899f8f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "UFQFPN-32(5x5)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "33"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "stm32l431kbu6"
  ],
  "discovery_pitch": "STM32L431KBU6 (STMicroelectronics) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "stm32l431kbu6.kicad_sym",
    "stm32l431kbu6.kicad_mod",
    "stm32l431kbu6.glb",
    "stm32l431kbu6.step",
    "stm32l431kbu6.lbr",
    "docs/hero.png",
    "docs/stm32l431kbu6-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
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  "visibility": {
    "public": true
  }
}