ESP32-C3FN4

{
  "slug": "esp32-c3fn4",
  "version": "0.1.0",
  "type": "component",
  "description": "Espressif Systems RF and Wireless, 32-VFQFN Exposed Pad. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "rf and wireless",
    "esp32-c3fn4",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "esp32-c3fn4.kicad_sym",
    "esp32-c3fn4.kicad_mod",
    "esp32-c3fn4.glb",
    "esp32-c3fn4.step",
    "esp32-c3fn4.lbr",
    "docs/hero.png",
    "docs/esp32-c3fn4-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "esp32-c3fn4-hero.glb",
    "esp32-c3fn4-hero.overlay.json",
    "esp32-c3fn4-etched.glb"
  ],
  "component": {
    "mpn": "ESP32-C3FN4",
    "manufacturer": "Espressif Systems",
    "package": "32-VFQFN Exposed Pad",
    "pin_count": 33,
    "category": "RF and Wireless",
    "subcategory": "RF and Wireless",
    "datasheet": "https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf",
    "parts": {
      "symbol": "esp32-c3fn4.kicad_sym",
      "footprint": "esp32-c3fn4.kicad_mod",
      "model_3d": "esp32-c3fn4-hero.glb",
      "model_3d_plain": "esp32-c3fn4-etched.glb",
      "model_3d_step": "esp32-c3fn4-etched.step",
      "model_3d_step_plain": "esp32-c3fn4.step",
      "lbr": "esp32-c3fn4.lbr"
    },
    "distributor_links": {
      "mouser": "356-ESP32-C3FN4"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T23:33:52Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 953 calls left today"
      },
      "mouser": {
        "pn": "356-ESP32-C3FN4",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "LNA_IN",
        "type": "bidirectional",
        "description": "RF low-noise amplifier (LNA) input/output signal pin."
      },
      {
        "number": "2",
        "name": "VDD3P3",
        "type": "power_in",
        "description": "Input power supply for the analog power domain."
      },
      {
        "number": "3",
        "name": "VDD3P3",
        "type": "power_in",
        "description": "Input power supply for the analog power domain."
      },
      {
        "number": "4",
        "name": "XTAL_32K_P",
        "type": "bidirectional",
        "description": "Positive 32 kHz clock signal connected to the chip's crystal or oscillator; also usable as GPIO0 and ADC1_CH0."
      },
      {
        "number": "5",
        "name": "XTAL_32K_N",
        "type": "bidirectional",
        "description": "Negative 32 kHz clock signal connected to the chip's crystal or oscillator; also usable as GPIO1 and ADC1_CH1."
      },
      {
        "number": "6",
        "name": "GPIO2",
        "type": "bidirectional",
        "description": "GPIO2 is a strapping pin that should be used with caution, with a default drive strength of 10 mA and ADC1_CH2 as an analog function."
      },
      {
        "number": "7",
        "name": "CHIP_EN",
        "type": "input",
        "description": "High enables the chip (powered up) and low disables it (powered down); do not leave this pin floating."
      },
      {
        "number": "8",
        "name": "GPIO3",
        "type": "bidirectional",
        "description": "General-purpose IO with a default drive strength of 10 mA and ADC1_CH3 as an analog function."
      },
      {
        "number": "9",
        "name": "MTMS",
        "type": "bidirectional",
        "description": "JTAG test mode select signal, with a default drive strength of 10 mA and ADC1_CH4 as an analog function."
      },
      {
        "number": "10",
        "name": "MTDI",
        "type": "bidirectional",
        "description": "JTAG test data input, with a default drive strength of 10 mA and ADC2_CH0 as an analog function."
      },
      {
        "number": "11",
        "name": "VDD3P3_RTC",
        "type": "power_in",
        "description": "Input power supply for the RTC and part of the digital power domains, powering the RTC IO pins."
      },
      {
        "number": "12",
        "name": "MTCK",
        "type": "bidirectional",
        "description": "JTAG test clock signal; it has a low-level glitch of about 5 ns during power-up."
      },
      {
        "number": "13",
        "name": "MTDO",
        "type": "bidirectional",
        "description": "JTAG test data output signal; it has a low-level glitch of about 5 ns during power-up."
      },
      {
        "number": "14",
        "name": "GPIO8",
        "type": "bidirectional",
        "description": "Strapping pin that should be used with caution because it is at a defined logic level at startup."
      },
      {
        "number": "15",
        "name": "GPIO9",
        "type": "bidirectional",
        "description": "Strapping pin with the internal weak pull-up enabled, which should be used with caution."
      },
      {
        "number": "16",
        "name": "GPIO10",
        "type": "bidirectional",
        "description": "General-purpose IO that is also usable as FSPICS0; it has a low-level glitch of about 5 ns during power-up."
      },
      {
        "number": "17",
        "name": "VDD3P3_CPU",
        "type": "power_in",
        "description": "Input power supply for the digital power domain, powering the digital IO pins."
      },
      {
        "number": "18",
        "name": "VDD_SPI",
        "type": "power_in",
        "description": "Input from the in-package flash backup power line and output supplying the in-package and off-package flash SPI IO; it can be reconfigured as a GPIO only if the flash has an external power supply."
      },
      {
        "number": "19",
        "name": "SPIHD",
        "type": "bidirectional",
        "description": "SPI0/1 hold signal for the in-package flash, which is not recommended for other uses; the pin has the internal weak pull-up enabled."
      },
      {
        "number": "20",
        "name": "SPIWP",
        "type": "bidirectional",
        "description": "SPI0/1 write-protect signal for the in-package flash, which is not recommended for other uses; the pin has the internal weak pull-up enabled."
      },
      {
        "number": "21",
        "name": "SPICS0",
        "type": "bidirectional",
        "description": "SPI0/1 chip-select signal for the in-package flash, which is not recommended for other uses; the pin has the internal weak pull-up enabled."
      },
      {
        "number": "22",
        "name": "SPICLK",
        "type": "bidirectional",
        "description": "SPI0/1 clock signal for the in-package flash, which is not recommended for other uses; the pin has the internal weak pull-up enabled."
      },
      {
        "number": "23",
        "name": "SPID",
        "type": "bidirectional",
        "description": "SPI0/1 data signal for the in-package flash, which is not recommended for other uses; the pin has the internal weak pull-up enabled."
      },
      {
        "number": "24",
        "name": "SPIQ",
        "type": "bidirectional",
        "description": "SPI0/1 data signal for the in-package flash, which is not recommended for other uses; the pin has the internal weak pull-up enabled."
      },
      {
        "number": "25",
        "name": "GPIO18",
        "type": "bidirectional",
        "description": "General-purpose IO that is also the USB_D- signal of the USB Serial/JTAG controller; it has a high-level glitch of about 50000 ns during power-up and a default drive strength of 40 mA."
      },
      {
        "number": "26",
        "name": "GPIO19",
        "type": "bidirectional",
        "description": "General-purpose IO that is also the USB_D+ signal of the USB Serial/JTAG controller, with a default drive strength of 40 mA."
      },
      {
        "number": "27",
        "name": "U0RXD",
        "type": "bidirectional",
        "description": "UART0 receive data signal with the internal weak pull-up enabled; it has a low-level glitch of about 5 ns during power-up."
      },
      {
        "number": "28",
        "name": "U0TXD",
        "type": "bidirectional",
        "description": "UART0 transmit data signal with the internal weak pull-up enabled."
      },
      {
        "number": "29",
        "name": "XTAL_N",
        "type": "passive",
        "description": "Differential external clock input/output negative connected to the chip's crystal or oscillator."
      },
      {
        "number": "30",
        "name": "XTAL_P",
        "type": "passive",
        "description": "Differential external clock input/output positive connected to the chip's crystal or oscillator."
      },
      {
        "number": "31",
        "name": "VDDA",
        "type": "power_in",
        "description": "Input power supply for the analog power domain."
      },
      {
        "number": "32",
        "name": "VDDA",
        "type": "power_in",
        "description": "Input power supply for the analog power domain."
      },
      {
        "number": "33",
        "name": "GND",
        "type": "power_in",
        "description": "Ground connection, given as the exposed pad of the QFN32 package."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The hint says 32-VFQFN Exposed Pad, but the datasheet calls the package QFN32 (5×5 mm). The pin list"
        ],
        "pages_sent": 38,
        "cost_usd": 0.1059,
        "at": "2026-10-27T23:34:15"
      },
      "datasheet": {
        "url": "https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf",
        "pages": 76,
        "sha256": "833fc000b4b3c3d3",
        "source_tier": "mfr"
      },
      "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"
    },
    "models_3d": [
      {
        "file": "esp32-c3fn4.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ba0561bc79f5a9da290aa7993318c1df3e9b747fb31b8816e75afc092c57352b",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "esp32-c3fn4-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "f37128ad1f2f0c1cc4f3b46869d9ca409007c6bf8ef01d7b47de0892ccebdf9b",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}