LM339

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm339",
  "title": "LM339",
  "brief": "TI quad differential comparator, SOIC-14. Open-collector outputs, single or split 2-36 V supply. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "comparator",
    "quad",
    "open-collector",
    "soic-14",
    "texas-instruments"
  ],
  "component": {
    "mpn": "LM339",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Comparator",
    "subcategory": "Quad differential comparator",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lm339.pdf",
    "parts": {
      "symbol": "lm339.kicad_sym",
      "footprint": "lm339.kicad_mod",
      "model_3d": "lm339-etched.glb",
      "model_3d_plain": "lm339.glb",
      "lbr": "lm339.lbr",
      "model_3d_step": "lm339-etched.step",
      "model_3d_step_plain": "lm339.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "1OUT",
        "type": "output",
        "description": "Open-collector output of comparator 1. Requires an external pull-up resistor to VCC. Sink current up to 20 mA."
      },
      {
        "number": "2",
        "name": "2OUT",
        "type": "output",
        "description": "Open-collector output of comparator 2. Requires external pull-up to VCC."
      },
      {
        "number": "3",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. 2 V to 36 V (LM339) or up to 38 V (LM339B). Single-supply operation supported."
      },
      {
        "number": "4",
        "name": "2IN-",
        "type": "input",
        "description": "Inverting (negative) input of comparator 2. Common-mode range includes ground."
      },
      {
        "number": "5",
        "name": "2IN+",
        "type": "input",
        "description": "Non-inverting (positive) input of comparator 2. Common-mode range includes ground."
      },
      {
        "number": "6",
        "name": "1IN-",
        "type": "input",
        "description": "Inverting (negative) input of comparator 1. Common-mode range includes ground."
      },
      {
        "number": "7",
        "name": "1IN+",
        "type": "input",
        "description": "Non-inverting (positive) input of comparator 1. Common-mode range includes ground."
      },
      {
        "number": "8",
        "name": "3IN-",
        "type": "input",
        "description": "Inverting (negative) input of comparator 3. Common-mode range includes ground."
      },
      {
        "number": "9",
        "name": "3IN+",
        "type": "input",
        "description": "Non-inverting (positive) input of comparator 3. Common-mode range includes ground."
      },
      {
        "number": "10",
        "name": "4IN-",
        "type": "input",
        "description": "Inverting (negative) input of comparator 4. Common-mode range includes ground."
      },
      {
        "number": "11",
        "name": "4IN+",
        "type": "input",
        "description": "Non-inverting (positive) input of comparator 4. Common-mode range includes ground."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Negative supply / ground reference. Tied to system ground in single-supply operation."
      },
      {
        "number": "13",
        "name": "4OUT",
        "type": "output",
        "description": "Open-collector output of comparator 4. Requires external pull-up to VCC."
      },
      {
        "number": "14",
        "name": "3OUT",
        "type": "output",
        "description": "Open-collector output of comparator 3. Requires external pull-up to VCC."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lm339.pdf",
        "pages": 54,
        "sha256": "2a488cbc06c3e6c4",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lm339.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          8.7,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm339-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          8.7,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "1d29a4513453605e7d8da0c6bf5a7ce7d2ebc4782da6f80d5b840a3c9a8cb332",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Quad differential comparator",
      "Comparators": "4 independent",
      "Output": "open-collector (needs pull-up)",
      "Input range": "down to negative rail",
      "Supply": "2-36 V single or ±1-18 V split",
      "Response time": "~1.3 µs",
      "Offset voltage": "±2 mV typ",
      "Package": "SOIC-14"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lm339",
    "quad comparator",
    "voltage comparator",
    "4 comparators"
  ],
  "discovery_pitch": "LM339 quad differential comparator (SOIC-14, open-collector) 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",
    "lm339.kicad_sym",
    "lm339.kicad_mod",
    "lm339.glb",
    "lm339.lbr",
    "docs/hero.png",
    "docs/lm339-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm339-etched.step"
  ],
  "variants": [
    {
      "mpn": "LM339D (SOIC-14, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "LM339DR (SOIC-14, tape & reel)",
      "kind": "packaging"
    }
  ]
}