ESP8266EX

{
  "slug": "esp8266ex",
  "version": "0.1.0",
  "type": "component",
  "description": "Espressif Systems RF Transceiver ICs, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "rf and wireless",
    "esp8266ex",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "esp8266ex.kicad_sym",
    "esp8266ex.kicad_mod",
    "esp8266ex.glb",
    "esp8266ex.step",
    "esp8266ex.lbr",
    "docs/hero.png",
    "docs/esp8266ex-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "esp8266ex-hero.glb",
    "esp8266ex-hero.overlay.json",
    "esp8266ex-etched.glb"
  ],
  "component": {
    "mpn": "ESP8266EX",
    "manufacturer": "Espressif Systems",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "RF And Wireless",
    "subcategory": "RF Transceiver ICs",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175446068678656",
    "parts": {
      "symbol": "esp8266ex.kicad_sym",
      "footprint": "esp8266ex.kicad_mod",
      "model_3d": "esp8266ex-hero.glb",
      "model_3d_plain": "esp8266ex-etched.glb",
      "model_3d_step": "esp8266ex-etched.step",
      "model_3d_step_plain": "esp8266ex.step",
      "lbr": "esp8266ex.lbr"
    },
    "distributor_links": {
      "lcsc": "C77967",
      "digikey": "1904-1001-2-ND",
      "mouser": "356-ESP8266EX"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T02:50:28Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "1904-1001-2-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "356-ESP8266EX",
        "status": "found",
        "lifecycle": "Not Recommended for New Designs"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDDA",
        "type": "power_in",
        "description": "Analog supply pin, 2.5 V to 3.6 V."
      },
      {
        "number": "2",
        "name": "LNA",
        "type": "bidirectional",
        "description": "RF antenna interface with chip output impedance of 39 + j6 Ω; a π-type matching network is recommended between the chip and the antenna."
      },
      {
        "number": "3",
        "name": "VDD3P3",
        "type": "power_in",
        "description": "Power amplifier supply, 2.5 V to 3.6 V."
      },
      {
        "number": "4",
        "name": "VDD3P3",
        "type": "power_in",
        "description": "Power amplifier supply, 2.5 V to 3.6 V."
      },
      {
        "number": "5",
        "name": "VDD_RTC",
        "type": "unconnected",
        "description": "Listed as NC with a 1.1 V level in the pin table, so it is not for external connection."
      },
      {
        "number": "6",
        "name": "TOUT",
        "type": "input",
        "description": "Internal ADC input that can measure VDD3P3 or the TOUT voltage (not both at once); when used with an external circuit the input range is 0 V to 1.0 V, and the hardware design requires this pin to be left floating."
      },
      {
        "number": "7",
        "name": "CHIP_EN",
        "type": "input",
        "description": "Chip enable: high enables normal operation, low shuts the chip down with very low current."
      },
      {
        "number": "8",
        "name": "XPD_DCDC",
        "type": "bidirectional",
        "description": "Deep-sleep wake-up pin, also GPIO16; only the internal pull-down can be enabled on this pad."
      },
      {
        "number": "9",
        "name": "MTMS",
        "type": "bidirectional",
        "description": "GPIO14, also HSPI_CLK; can be configured with internal pull-up or pull-down and as a tri-state output."
      },
      {
        "number": "10",
        "name": "MTDI",
        "type": "bidirectional",
        "description": "GPIO12, also HSPI_MISO."
      },
      {
        "number": "11",
        "name": "VDDPST",
        "type": "power_in",
        "description": "Digital/IO supply, 1.8 V to 3.6 V."
      },
      {
        "number": "12",
        "name": "MTCK",
        "type": "bidirectional",
        "description": "GPIO13, also HSPI_MOSI and UART0_CTS."
      },
      {
        "number": "13",
        "name": "MTDO",
        "type": "bidirectional",
        "description": "GPIO15, also HSPI_CS and UART0_RTS; used with GPIO2 and GPIO0 for boot mode and SDIO mode selection."
      },
      {
        "number": "14",
        "name": "GPIO2",
        "type": "bidirectional",
        "description": "GPIO2, also UART1_TX usable when burning flash; used with GPIO0 and MTDO for boot mode and SDIO mode selection."
      },
      {
        "number": "15",
        "name": "GPIO0",
        "type": "bidirectional",
        "description": "GPIO0, also SPI_CS2; used with GPIO2 and MTDO for boot mode and SDIO mode selection."
      },
      {
        "number": "16",
        "name": "GPIO4",
        "type": "bidirectional",
        "description": "GPIO4, also PWM3."
      },
      {
        "number": "17",
        "name": "VDDPST",
        "type": "power_in",
        "description": "Digital/IO supply, 1.8 V to 3.6 V."
      },
      {
        "number": "18",
        "name": "SDIO_DATA_2",
        "type": "bidirectional",
        "description": "Connected to SD_D2 through a 200 Ω series resistor; also HSPIHD and GPIO9."
      },
      {
        "number": "19",
        "name": "SDIO_DATA_3",
        "type": "bidirectional",
        "description": "Connected to SD_D3 through a 200 Ω series resistor; also SPIWP, HSPIWP and GPIO10."
      },
      {
        "number": "20",
        "name": "SDIO_CMD",
        "type": "bidirectional",
        "description": "Connected to SD_CMD through a 200 Ω series resistor; also SPI_CS0 and GPIO11."
      },
      {
        "number": "21",
        "name": "SDIO_CLK",
        "type": "bidirectional",
        "description": "Connected to SD_CLK through a 200 Ω series resistor; also SPI_CLK and GPIO6."
      },
      {
        "number": "22",
        "name": "SDIO_DATA_0",
        "type": "bidirectional",
        "description": "Connected to SD_D0 through a 200 Ω series resistor; also SPI_MISO and GPIO7."
      },
      {
        "number": "23",
        "name": "SDIO_DATA_1",
        "type": "bidirectional",
        "description": "Connected to SD_D1 through a 200 Ω series resistor; also SPI_MOSI and GPIO8."
      },
      {
        "number": "24",
        "name": "GPIO5",
        "type": "bidirectional",
        "description": "GPIO5, also IR RX."
      },
      {
        "number": "25",
        "name": "U0RXD",
        "type": "bidirectional",
        "description": "UART0 RX usable when burning flash, also GPIO3."
      },
      {
        "number": "26",
        "name": "U0TXD",
        "type": "bidirectional",
        "description": "UART0 TX usable when burning flash, also GPIO1 and SPI_CS1; should not be pulled low externally during power-up."
      },
      {
        "number": "27",
        "name": "XTAL_OUT",
        "type": "bidirectional",
        "description": "Crystal oscillator output, which can also provide the clock input for BT."
      },
      {
        "number": "28",
        "name": "XTAL_IN",
        "type": "bidirectional",
        "description": "Crystal oscillator input."
      },
      {
        "number": "29",
        "name": "VDDD",
        "type": "power_in",
        "description": "Analog supply, 2.5 V to 3.6 V."
      },
      {
        "number": "30",
        "name": "VDDA",
        "type": "power_in",
        "description": "Analog supply, 2.5 V to 3.6 V."
      },
      {
        "number": "31",
        "name": "RES12K",
        "type": "input",
        "description": "Connect through a 12 kΩ series resistor to ground."
      },
      {
        "number": "32",
        "name": "EXT_RSTB",
        "type": "input",
        "description": "External reset signal, active low."
      },
      {
        "number": "33",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (exposed pad), shown as pin 33 in the pin layout diagram; not listed in Table 2-1."
      }
    ],
    "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: Table 2-1 lists the type as P but the function as NC (1.1 V); typed as unconnected, please confirm a; Pin 33 GND appears only in the layout diagram text on page 10 and is not in Table 2-1; included as t; Datasheet gives both a 0 V to 1.0 V input range when an external circuit is connected and a requirem"
        ],
        "pages_sent": 32,
        "cost_usd": 0.1194,
        "at": "2026-10-17T02:50:07"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175446068678656",
        "pages": 32,
        "sha256": "4e8b483c552a4926",
        "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"
    },
    "models_3d": [
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        "file": "esp8266ex.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "esp8266ex-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
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        "sha256": "d93e60e6b9032d351406a572bc77396dc29b7e7dc9e8a4790e1f30dea4c1f444",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}