MCP9808 Precision Temp Sensor

{
  "schema_version": 1,
  "type": "component",
  "slug": "mcp9808",
  "title": "MCP9808 Precision Temp Sensor",
  "brief": "Digital I2C temperature sensor with +-0.5 C accuracy and a programmable alert output.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "temperature",
    "sensor",
    "i2c",
    "digital",
    "alert",
    "microchip",
    "msop-8"
  ],
  "component": {
    "mpn": "MCP9808",
    "manufacturer": "Microchip",
    "package": "MSOP-8",
    "pin_count": 8,
    "category": "Sensor",
    "subcategory": "Temperature Sensor",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/MCP9808-0.5C-Maximum-Accuracy-Digital-Temperature-Sensor-Data-Sheet-DS20005095B.pdf",
    "parts": {
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      "footprint": "mcp9808.kicad_mod",
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      "model_3d_plain": "mcp9808.glb",
      "model_3d_step": "mcp9808-etched.step",
      "model_3d_step_plain": "mcp9808.step",
      "lbr": "mcp9808.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C/SMBus serial data. Open-drain bidirectional line; requires an external pull-up resistor. VIH ≥ 0.7·VDD, VIL ≤ 0.3·VDD; VOL ≤ 0.4 V at IOL = 3 mA. Supports 0-400 kHz clock."
      },
      {
        "number": "2",
        "name": "SCL",
        "type": "input",
        "description": "I2C/SMBus serial clock input. Requires an external pull-up resistor. VIH ≥ 0.7·VDD, VIL ≤ 0.3·VDD; input current ±5 µA max. 0-400 kHz."
      },
      {
        "number": "3",
        "name": "Alert",
        "type": "output",
        "description": "Temperature Alert output. Open-drain output requiring an external pull-up resistor. Programmable polarity (active-low or active-high) and operating mode (comparator/thermostat or interrupt). VOL ≤ 0.4 V at IOL = 3 mA; leakage IOH = 1 µA typ."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device. Connect to the system ground plane."
      },
      {
        "number": "5",
        "name": "A2",
        "type": "input",
        "description": "I2C slave address select bit 2. Tie to VDD or GND to set one of eight selectable slave addresses (0011 A2 A1 A0). Logic level latched at power-up."
      },
      {
        "number": "6",
        "name": "A1",
        "type": "input",
        "description": "I2C slave address select bit 1. Tie to VDD or GND to set part of the 3-bit user address."
      },
      {
        "number": "7",
        "name": "A0",
        "type": "input",
        "description": "I2C slave address select bit 0. Tie to VDD or GND to set part of the 3-bit user address."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply input, 2.7 V to 5.5 V. Bypass with a 0.1 µF ceramic capacitor placed close to the pin. IDD = 200 µA typ (400 µA max); ISHDN = 0.1 µA typ."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/MCP9808-0.5C-Maximum-Accuracy-Digital-Temperature-Sensor-Data-Sheet-DS20005095B.pdf",
        "pages": 53,
        "sha256": "e7b6502f744c3e60",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "mcp9808.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3.0,
          0.95
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "847c4c5023fe1603fbd36900a5dcc4bd3901ba473f71d42c9a469f0236eaadf3",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mcp9808-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "sha256": "7bf8c9167da62eb10be3562f54a0e7506ae3db3736992f3d041bdcc2bc262d5b",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Digital I2C temperature sensor",
      "Accuracy": "+-0.25 C typ, +-0.5 C max (-20 to 100 C)",
      "Resolution": "0.0625 C (up to 12-bit)",
      "Interface": "I2C / SMBus",
      "Alert": "Programmable open-drain (over/under/critical)",
      "Addresses": "3 address pins (up to 8 on a bus)",
      "Supply voltage": "2.7 V to 5.5 V",
      "Operating temperature": "-40 C to 125 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "precision temperature sensor",
    "I2C temp sensor",
    "thermal alert",
    "digital thermometer"
  ],
  "discovery_pitch": "A digital temperature sensor with +-0.5 C accuracy over I2C plus a programmable over/under-temperature alert pin.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "docs/hero.png",
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    "viewers/symbol.html",
    "viewers/footprint.html",
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  "variants": [
    {
      "mpn": "MCP9808MS",
      "kind": "unknown"
    },
    {
      "mpn": "MCP9808T-MS",
      "kind": "unknown"
    },
    {
      "mpn": "MCP9808MC",
      "kind": "unknown"
    },
    {
      "mpn": "MCP9808T-MC",
      "kind": "unknown"
    }
  ]
}