DS1621

{
  "schema_version": 1,
  "type": "component",
  "slug": "ds1621",
  "title": "DS1621",
  "brief": "ADI (Maxim) digital thermometer and thermostat, I2C, SOIC-8. 9-bit, -55 to 125 C, TOUT alarm. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "sensor",
    "temperature",
    "thermostat",
    "i2c",
    "soic-8",
    "analog-devices"
  ],
  "component": {
    "mpn": "DS1621",
    "manufacturer": "Analog Devices",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Sensor",
    "subcategory": "Temperature sensor / thermostat",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/DS1621.pdf",
    "parts": {
      "symbol": "ds1621.kicad_sym",
      "footprint": "ds1621.kicad_mod",
      "model_3d": "ds1621-etched.glb",
      "model_3d_plain": "ds1621.glb",
      "model_3d_step": "ds1621-etched.step",
      "model_3d_step_plain": "ds1621.step",
      "lbr": "ds1621.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "SDA",
        "type": "bidirectional",
        "description": "2-wire serial data input/output (open-drain). Requires external pull-up to VDD."
      },
      {
        "number": "2",
        "name": "SCL",
        "type": "input",
        "description": "2-wire serial clock input/output (open-drain). Clock line for I²C-compatible communication."
      },
      {
        "number": "3",
        "name": "TOUT",
        "type": "output",
        "description": "Thermostat output. Active when measured temperature exceeds TH; deasserts when temperature falls below TL, providing programmable hysteresis."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin (0 V)."
      },
      {
        "number": "5",
        "name": "A2",
        "type": "input",
        "description": "Chip address input pin (MSB of 3-bit slave-address selector). Tie to VDD or GND to set device address on shared 2-wire bus."
      },
      {
        "number": "6",
        "name": "A1",
        "type": "input",
        "description": "Chip address input pin. Tie to VDD or GND to set device address on shared 2-wire bus."
      },
      {
        "number": "7",
        "name": "A0",
        "type": "input",
        "description": "Chip address input pin (LSB of 3-bit slave-address selector). Tie to VDD or GND to set device address on shared 2-wire bus."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply voltage input pin. Operating range 2.7 V to 5.5 V. Bypass to GND with a 0.1 µF capacitor close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/DS1621.pdf",
        "pages": 16,
        "sha256": "faa68e65a7b2f8f0",
        "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": "ds1621.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ds1621-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "e193dc0d60f77fcad83d2ff4cd44c83c989e9358ba5e61f6deba0c6e247feb9a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Digital thermometer + thermostat",
      "Interface": "I2C (8 addresses)",
      "Resolution": "9-bit (0.5 C)",
      "Range": "-55 to 125 C",
      "Thermostat output": "TOUT with programmable trip + hysteresis",
      "Nonvolatile": "Trip points stored in EEPROM",
      "Supply": "2.7-5.5 V",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ds1621",
    "i2c thermometer",
    "digital thermostat",
    "temperature switch ic"
  ],
  "discovery_pitch": "ADI DS1621 digital thermometer and thermostat (SOIC-8, I2C) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ds1621.kicad_sym",
    "ds1621.kicad_mod",
    "ds1621.glb",
    "ds1621.step",
    "ds1621.lbr",
    "docs/hero.png",
    "docs/ds1621-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ds1621-etched.step"
  ],
  "variants": [
    {
      "mpn": "DS1621S+ (SOIC-8)",
      "kind": "packaging"
    },
    {
      "mpn": "DS1621+ (PDIP-8)",
      "kind": "packaging"
    }
  ]
}