LM337

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm337",
  "title": "LM337",
  "brief": "TI adjustable negative linear regulator, TO-220. -1.2 to -37 V, 1.5 A. The negative complement of LM317. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "voltage-regulator",
    "linear-regulator",
    "negative",
    "adjustable",
    "to-220",
    "texas-instruments"
  ],
  "component": {
    "mpn": "LM337",
    "manufacturer": "Texas Instruments",
    "package": "TO-220",
    "pin_count": 3,
    "category": "Power Management",
    "subcategory": "Adjustable negative linear regulator",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lm337.pdf",
    "parts": {
      "symbol": "lm337.kicad_sym",
      "footprint": "lm337.kicad_mod",
      "model_3d": "lm337-etched.glb",
      "model_3d_plain": "lm337.glb",
      "lbr": "lm337.lbr",
      "model_3d_step": "lm337-etched.step",
      "model_3d_step_plain": "lm337.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "ADJUSTMENT",
        "type": "input",
        "description": "Adjustment pin for the output voltage. Connect two external resistors between OUTPUT, ADJUSTMENT, and ground to set the output voltage; typical ADJUSTMENT current is 65 uA (100 uA max). Reference voltage from OUTPUT to ADJUSTMENT is -1.25 V (typ)."
      },
      {
        "number": "2",
        "name": "INPUT",
        "type": "power_in",
        "description": "Negative input supply voltage (V_I). Input-to-output differential voltage range is -2.5 V to -37 V (abs max -40 V). Recommend a 0.1-uF bypass capacitor across the input."
      },
      {
        "number": "3",
        "name": "OUTPUT",
        "type": "power_out",
        "description": "Regulated negative output voltage (V_O), adjustable from -1.2 V to -37 V. Peak output current 1.5 A (2.2 A typ). Recommend a 1-uF output capacitor for stability."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lm337.pdf",
        "pages": 25,
        "sha256": "9314cd867e85589c",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "lm337.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          10.25,
          4.455,
          28.525
        ],
        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
        "footprint_binding": "identity",
        "sha256": "7cb065d935df5771f0ba6e48ddd180863a121af76483dad7f18e667a7b68204a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm337-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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          4.455,
          28.525
        ],
        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
        "footprint_binding": "identity",
        "sha256": "69ed2722c12f1356dc6e6e150f7534ad2c6a8029ccca25aa9cd7f860cde4ce42",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Adjustable negative linear regulator",
      "Output voltage": "-1.2 to -37 V",
      "Output current": "up to 1.5 A",
      "Reference": "1.25 V (ADJ to OUT)",
      "Protection": "Current limit + SOA + thermal shutdown",
      "Pinout": "1=ADJ, 2=VIN, 3=VOUT",
      "Line regulation": "typ. 0.01 %/V",
      "Package": "TO-220 (3-lead)"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lm337",
    "negative regulator",
    "adjustable negative voltage",
    "lm317 complement"
  ],
  "discovery_pitch": "LM337 adjustable negative linear voltage regulator (TO-220, -1.2 to -37 V) 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": [
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    "README.md",
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    "lm337.kicad_mod",
    "lm337.glb",
    "lm337.lbr",
    "docs/hero.png",
    "docs/lm337-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm337-etched.step"
  ],
  "variants": [
    {
      "mpn": "LM337KCT (TO-220)",
      "kind": "packaging"
    },
    {
      "mpn": "LM337KTTR (TO-220, tape & reel)",
      "kind": "packaging"
    }
  ]
}