ULN2803QN

{
  "schema_version": 1,
  "type": "component",
  "slug": "uln2803qn",
  "title": "ULN2803QN",
  "brief": "BORN Darlington Transistor Arrays, QFN4x4-20L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "transistors-thyristors",
    "uln2803qn",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ULN2803QN",
    "manufacturer": "BORN",
    "package": "QFN4x4-20L",
    "pin_count": 21,
    "category": "Transistors/Thyristors",
    "subcategory": "Darlington Transistor Arrays",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590909068406312960",
    "parts": {
      "symbol": "uln2803qn.kicad_sym",
      "footprint": "uln2803qn.kicad_mod",
      "model_3d": "uln2803qn-hero.glb",
      "model_3d_plain": "uln2803qn.glb",
      "model_3d_step": "uln2803qn-etched.step",
      "model_3d_step_plain": "uln2803qn.step",
      "lbr": "uln2803qn.lbr"
    },
    "distributor_links": {
      "lcsc": "C7461219"
    },
    "distributor_check": {
      "checked_at": "2026-10-09T18:16:03Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "3B",
        "type": "input",
        "description": "Base input of Darlington pair 3; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "2",
        "name": "4B",
        "type": "input",
        "description": "Base input of Darlington pair 4; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "3",
        "name": "5B",
        "type": "input",
        "description": "Base input of Darlington pair 5; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "4",
        "name": "6B",
        "type": "input",
        "description": "Base input of Darlington pair 6; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "5",
        "name": "7B",
        "type": "input",
        "description": "Base input of Darlington pair 7; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "6",
        "name": "8B",
        "type": "input",
        "description": "Base input of Darlington pair 8; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "7",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "8",
        "name": "E",
        "type": "power_in",
        "description": "Common emitter (CE, ground) for all seven Darlington pairs; total emitter-terminal current is limited to -2.5 A."
      },
      {
        "number": "9",
        "name": "COM",
        "type": "power_in",
        "description": "Common clamp diodes (CC Diodes) for inductive-load suppression; the COM pin voltage is rated up to 50 V."
      },
      {
        "number": "10",
        "name": "8C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 8; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "11",
        "name": "7C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 7; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "12",
        "name": "6C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 6; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "13",
        "name": "5C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 5; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "14",
        "name": "4C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 4; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "15",
        "name": "3C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 3; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "16",
        "name": "2C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 2; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "17",
        "name": "1C",
        "type": "output",
        "description": "Open-collector output of Darlington pair 1; rated 500 mA per channel with collector-emitter voltage up to 50 V."
      },
      {
        "number": "18",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "19",
        "name": "1B",
        "type": "input",
        "description": "Base input of Darlington pair 1; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "20",
        "name": "2B",
        "type": "input",
        "description": "Base input of Darlington pair 2; input voltage is limited to -0.5 V to 30 V per the absolute maximum ratings."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: The datasheet pin table (page 2) lists 20 pins for the QFN4X4-20L package, matching the requested pa; Pin 9 is named COM, described in the table as 'CC Diodes = Common Clamp Diodes'. The datasheet does ; The pin table and block diagram do not describe a thermal/exposed pad on the QFN4X4-20L package. Non",
          "exposed pad 21 added from the footprint"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0478,
        "at": "2026-10-09T18:13:08"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590909068406312960",
        "pages": 7,
        "sha256": "c60060c0f7c75dc5",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "uln2803qn.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          4,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uln2803qn-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          4,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "46dbfb7f58704e727270859dd7529e3e6f02244c3ba9b7138fea47a50ae93c3a",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "BORN",
      "Package": "QFN4x4-20L",
      "Category": "Transistors/Thyristors",
      "Pins": "21"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uln2803qn"
  ],
  "discovery_pitch": "ULN2803QN (BORN) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uln2803qn.kicad_sym",
    "uln2803qn.kicad_mod",
    "uln2803qn.glb",
    "uln2803qn.step",
    "uln2803qn.lbr",
    "docs/hero.png",
    "docs/uln2803qn-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uln2803qn-hero.glb",
    "uln2803qn-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}