DS18B20

{
  "schema_version": 1,
  "type": "component",
  "slug": "ds18b20",
  "title": "DS18B20",
  "brief": "Analog Devices 1-Wire digital thermometer, TO-92. -55 to +125 C, 9-12 bit, unique 64-bit ID, parasite power. Datasheet-verified.",
  "version": "0.1.4",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "sensor",
    "temperature",
    "1-wire",
    "thermometer",
    "to-92",
    "analog-devices"
  ],
  "component": {
    "mpn": "DS18B20",
    "manufacturer": "Analog Devices",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Sensor",
    "subcategory": "1-Wire digital temperature sensor",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/ds18b20.pdf",
    "parts": {
      "symbol": "ds18b20.kicad_sym",
      "footprint": "ds18b20.kicad_mod",
      "model_3d": "ds18b20-etched.glb",
      "model_3d_plain": "ds18b20.glb",
      "lbr": "ds18b20.lbr",
      "model_3d_step": "ds18b20-etched.step",
      "model_3d_step_plain": "ds18b20.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground return. In parasite-power mode VDD is also tied to GND; when powered externally via VDD, GND must not be floating."
      },
      {
        "number": "2",
        "name": "DQ",
        "type": "bidirectional",
        "description": "1-Wire data input/output. Open-drain, requires ~4.7 kΩ pull-up to VDD (3.0-5.5 V). Can source parasite power to the die when held high (up to ~1.5 mA during a conversion, which typically requires a strong MOSFET pull-up)."
      },
      {
        "number": "3",
        "name": "VDD",
        "type": "power_in",
        "description": "Optional external power supply, 3.0 V to 5.5 V. If tied to GND the device runs in parasite-power mode, drawing power from the DQ line. Recommended for reliable operation above 100 °C."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/ds18b20.pdf",
        "pages": 27,
        "sha256": "066c8a3c7e9222c4",
        "source_tier": "mfr",
        "cited_before": "https://cdn.sparkfun.com/datasheets/Sensors/Temp/DS18B20.pdf",
        "file": "docs/ds18b20-datasheet.pdf",
        "note": "Analog Devices DS18B20 19-7487 Rev 6 (7/19), fetched from the cited analog.com URL; replaces a SparkFun copy of a preliminary Dallas sheet"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      },
      "review_fix": {
        "at": "2026-11-10",
        "by": "part-reviewer (Ray review)",
        "what": "pin names set to the maker spelling from Analog Devices DS18B20 19-7487 Rev 6 (7/19) pin description, TO-92: 0 on the page, 1 on the symbol (numbers unchanged). docs/ datasheet is now Analog Devices DS18B20 19-7487 Rev 6 (7/19), fetched from the cited analog.com URL; replaces a SparkFun copy of a preliminary Dallas sheet."
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ds18b20.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          4.83,
          3.745,
          9.8
        ],
        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-11-10",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ds18b20-etched.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          4.83,
          3.745,
          9.83
        ],
        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "06d0a34c6631e381bc67315db797e7ef77c9017c899c7b1c443857967938a88d",
        "checked": "2026-11-10",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "1-Wire digital temperature sensor",
      "Range": "-55 to +125 °C",
      "Accuracy": "±0.5 °C (-10 to +85 °C)",
      "Resolution": "9-12 bit (programmable)",
      "Interface": "1-Wire (single data line)",
      "Addressing": "unique 64-bit lasered ID",
      "Power": "3.0-5.5 V or parasite",
      "Package": "TO-92 (3-lead)"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ds18b20",
    "1-wire temperature sensor",
    "digital thermometer",
    "one wire temp"
  ],
  "discovery_pitch": "DS18B20 1-Wire digital temperature sensor (TO-92) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ds18b20.kicad_sym",
    "ds18b20.kicad_mod",
    "ds18b20.glb",
    "docs/hero.png",
    "docs/ds18b20-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ds18b20-etched.glb",
    "ds18b20.lbr",
    "ds18b20-etched.step",
    "ds18b20.step"
  ],
  "variants": [
    {
      "mpn": "DS18B20 (TO-92)",
      "kind": "packaging"
    },
    {
      "mpn": "DS18B20+ (TO-92, RoHS)",
      "kind": "packaging"
    }
  ],
  "description": "Analog Devices 1-Wire digital thermometer, TO-92. -55 to +125 C, 9-12 bit, unique 64-bit ID, parasite power. Datasheet-verified.",
  "org": "adom"
}