LM3940IT-3.3

{
  "slug": "lm3940it-3-3",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Linear Voltage Regulators (LDO), TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power supply chip",
    "lm3940it-3.3",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm3940it-3-3.kicad_sym",
    "lm3940it-3-3.kicad_mod",
    "lm3940it-3-3.glb",
    "lm3940it-3-3.step",
    "lm3940it-3-3.lbr",
    "docs/hero.png",
    "docs/lm3940it-3-3-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm3940it-3-3-hero.glb",
    "lm3940it-3-3-hero.overlay.json",
    "lm3940it-3-3-etched.glb"
  ],
  "component": {
    "mpn": "LM3940IT-3.3",
    "manufacturer": "Texas Instruments",
    "package": "TO-220",
    "pin_count": 3,
    "category": "Power Supply Chip",
    "subcategory": "Linear Voltage Regulators (LDO)",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm3940",
    "parts": {
      "symbol": "lm3940it-3-3.kicad_sym",
      "footprint": "lm3940it-3-3.kicad_mod",
      "model_3d": "lm3940it-3-3-hero.glb",
      "model_3d_plain": "lm3940it-3-3-etched.glb",
      "model_3d_step": "lm3940it-3-3-etched.step",
      "model_3d_step_plain": "lm3940it-3-3.step",
      "lbr": "lm3940it-3-3.lbr"
    },
    "distributor_links": {
      "lcsc": "C2863697",
      "mouser": "926-LM3940IT-33"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T18:08:28Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 887 calls left today"
      },
      "mouser": {
        "pn": "926-LM3940IT-33",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "IN",
        "type": "power_in",
        "description": "Input voltage supply (4.5 V to 5.5 V recommended); a 0.47-µF capacitor should be connected at this input."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "power_out",
        "description": "Regulated 3.3-V output, up to 1 A; a 33-µF low ESR capacitor should be connected to this pin."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin table lists TO-220 (NDE) pins 1=IN, 2=GND, 3=OUT. The TO-220 tab is not listed in the pin table,"
        ],
        "pages_sent": 28,
        "cost_usd": 0.1466,
        "at": "2026-10-23T18:08:04"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm3940",
        "pages": 28,
        "sha256": "88a74e653c540072",
        "source_tier": "lcsc"
      },
      "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": [
      {
        "file": "lm3940it-3-3.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": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm3940it-3-3-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": [
          10.25,
          4.455,
          28.525
        ],
        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
        "footprint_binding": "identity",
        "sha256": "504d3a6d22f2921aa9e0761ae6a5f70abbf80e52680bb64b65da9c88a3ae9363",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}