ULN2004A Darlington Array

{
  "schema_version": 1,
  "type": "component",
  "slug": "uln2004a",
  "title": "ULN2004A Darlington Array",
  "brief": "Seven NPN Darlington pairs with 50 V, 500 mA outputs and clamp diodes, for 6-15 V CMOS inputs.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "darlington",
    "driver",
    "relay-driver",
    "transistor-array",
    "ti",
    "soic-16"
  ],
  "component": {
    "mpn": "ULN2004A",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Driver",
    "subcategory": "Transistor Array / Driver",
    "datasheet": "https://www.ti.com/lit/ds/symlink/uln2003a.pdf",
    "parts": {
      "symbol": "uln2004a.kicad_sym",
      "footprint": "uln2004a.kicad_mod",
      "model_3d": "uln2004a-etched.glb",
      "model_3d_plain": "uln2004a.glb",
      "model_3d_step": "uln2004a-etched.step",
      "model_3d_step_plain": "uln2004a.step",
      "lbr": "uln2004a.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "1B",
        "type": "input",
        "description": "Channel 1 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor); accepts 6V-15V logic."
      },
      {
        "number": "2",
        "name": "2B",
        "type": "input",
        "description": "Channel 2 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor)."
      },
      {
        "number": "3",
        "name": "3B",
        "type": "input",
        "description": "Channel 3 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor)."
      },
      {
        "number": "4",
        "name": "4B",
        "type": "input",
        "description": "Channel 4 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor)."
      },
      {
        "number": "5",
        "name": "5B",
        "type": "input",
        "description": "Channel 5 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor)."
      },
      {
        "number": "6",
        "name": "6B",
        "type": "input",
        "description": "Channel 6 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor)."
      },
      {
        "number": "7",
        "name": "7B",
        "type": "input",
        "description": "Channel 7 Darlington base input. CMOS/logic-level input (10.5kΩ series base resistor)."
      },
      {
        "number": "8",
        "name": "E",
        "type": "power_in",
        "description": "Common emitter shared by all seven Darlington channels. Typically tied to ground; all voltages are referenced to this terminal."
      },
      {
        "number": "9",
        "name": "COM",
        "type": "power_in",
        "description": "Common cathode node for the seven flyback (freewheeling) clamp diodes. Required for switching inductive loads - connect to the load supply rail."
      },
      {
        "number": "10",
        "name": "7C",
        "type": "output",
        "description": "Channel 7 Darlington open-collector output. Sinks up to 500mA at collector-emitter voltages up to 50V."
      },
      {
        "number": "11",
        "name": "6C",
        "type": "output",
        "description": "Channel 6 Darlington open-collector output. Sinks up to 500mA at up to 50V."
      },
      {
        "number": "12",
        "name": "5C",
        "type": "output",
        "description": "Channel 5 Darlington open-collector output. Sinks up to 500mA at up to 50V."
      },
      {
        "number": "13",
        "name": "4C",
        "type": "output",
        "description": "Channel 4 Darlington open-collector output. Sinks up to 500mA at up to 50V."
      },
      {
        "number": "14",
        "name": "3C",
        "type": "output",
        "description": "Channel 3 Darlington open-collector output. Sinks up to 500mA at up to 50V."
      },
      {
        "number": "15",
        "name": "2C",
        "type": "output",
        "description": "Channel 2 Darlington open-collector output. Sinks up to 500mA at up to 50V."
      },
      {
        "number": "16",
        "name": "1C",
        "type": "output",
        "description": "Channel 1 Darlington open-collector output. Sinks up to 500mA at up to 50V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/uln2003a.pdf",
        "pages": 42,
        "sha256": "0151daa4ffa9135f",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "uln2004a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uln2004a-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "sha256": "23b46287fac9f9e5eb9553e7f94ccc708c88b842408a5898aba8862f998c61e4",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "7-channel NPN Darlington array (sink)",
      "Output voltage": "50 V max",
      "Output current": "500 mA per channel",
      "Input": "6 V to 15 V CMOS/PMOS logic",
      "Clamp diodes": "Integrated common-cathode",
      "Operating temperature": "-40 C to 85 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "Darlington array",
    "relay driver",
    "drive 7 loads",
    "CMOS logic driver",
    "solenoid driver"
  ],
  "discovery_pitch": "Drive seven relays, solenoids, or LED banks from 6-15 V CMOS logic, with built-in flyback clamp diodes.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uln2004a.kicad_sym",
    "uln2004a.kicad_mod",
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    "uln2004a.lbr",
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    "docs/uln2004a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uln2004a-etched.step"
  ],
  "variants": [
    {
      "mpn": "ULN2004AD",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004AAD",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004AN",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004AAN",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004ANS",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004AANS",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004APW",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004AAPW",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004ADYY",
      "kind": "unknown"
    },
    {
      "mpn": "ULN2004AADYY",
      "kind": "unknown"
    }
  ]
}