main
Ray Set visibility: public c443207 4d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "0437003-wr",
  "title": "0437003.WR",
  "brief": "Littelfuse Disposable Fuses, 1206. 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",
    "circuit protection",
    "0437003.wr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "0437003.WR",
    "manufacturer": "Littelfuse",
    "package": "1206",
    "pin_count": 2,
    "category": "Circuit Protection",
    "subcategory": "Disposable Fuses",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588918578065625088",
    "parts": {
      "symbol": "0437003-wr.kicad_sym",
      "footprint": "0437003-wr.kicad_mod",
      "model_3d": "0437003-wr-hero.glb",
      "model_3d_plain": "0437003-wr-etched.glb",
      "model_3d_step": "0437003-wr-etched.step",
      "model_3d_step_plain": "0437003-wr.step",
      "lbr": "0437003-wr.lbr"
    },
    "distributor_links": {
      "lcsc": "C99539",
      "digikey": "F2887TR-ND",
      "mouser": "576-0437003.WR"
    },
    "distributor_check": {
      "checked_at": "2026-10-16T12:44:03Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "F2887TR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "576-0437003.WR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "1",
        "type": "passive",
        "description": "One of two interchangeable Ag/Ni/Sn end terminations of the 3A (amp code 003.) fast-acting fuse, rated 32 V AC / 35 V DC with 50 A interrupting rating and 0.033 ohm nominal resistance."
      },
      {
        "number": "2",
        "name": "2",
        "type": "passive",
        "description": "Second interchangeable Ag/Ni/Sn end termination of the 3A (amp code 003.) fast-acting fuse, rated 32 V AC / 35 V DC with 50 A interrupting rating and 0.033 ohm nominal resistance."
      }
    ],
    "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+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet does not print pin numbers or names. The dimension drawing and land pattern show two u",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 3,
        "cost_usd": 0.1065,
        "at": "2026-10-16T12:43:49"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588918578065625088",
        "pages": 3,
        "sha256": "c2236d59abc0fa90",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "0437003-wr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.2,
          1.6,
          0.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "5e6dcbe286696143d35a8ea37d91eef4b54ff3d1bd7c2c2b4dedda83d3f8e203",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "0437003-wr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.2,
          1.6,
          0.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4dfe40c22ba950b35e70b53635961e5fdc49be09c741d9f76697a2ed23d38840",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Littelfuse",
      "Package": "1206",
      "Category": "Circuit Protection",
      "Pins": "2"
    },
    "appearance": {
      "contacts": {
        "quote": "Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Ceramic/Lead-free",
        "page": 3,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "c2236d59abc0fa907f982bf181ae3e3224ba6995253d085c191e2c0513fef7bd"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "c2236d59abc0fa907f982bf181ae3e3224ba6995253d085c191e2c0513fef7bd",
      "rows": [
        {
          "name": "Opening time at 100% of ampere rating (250mA-8A)",
          "symbol": "",
          "kind": "electrical",
          "unit": "hours",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "100% of rated current (3A for this MPN), opening time at 25ºC",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Opening time at 250% of ampere rating (750mA-8A)",
          "symbol": "",
          "kind": "electrical",
          "unit": "s",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "250% of rated current, 750mA-8A ratings, opening time at 25ºC",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Opening time at 350% of ampere rating (750mA-8A)",
          "symbol": "",
          "kind": "electrical",
          "unit": "s",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "350% of rated current, 750mA-8A ratings, opening time at 25ºC",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Max. voltage rating",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 32,
          "conditions": "Amp code 003. (3A) row",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Interrupting rating",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "Printed as 50 A @ 32 V AC/35 V DC; AC tested at rated voltage with unity power factor, DC with time constant < 0.8 msec",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Nominal resistance",
          "symbol": "",
          "kind": "electrical",
          "unit": "Ohms",
          "min": null,
          "typ": 0.033,
          "max": null,
          "conditions": "Measured with < 10% rated current",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Nominal melting I2t",
          "symbol": "",
          "kind": "electrical",
          "unit": "A2Sec.",
          "min": null,
          "typ": 0.506,
          "max": null,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Nominal voltage drop at rated current",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.14,
          "max": null,
          "conditions": "At rated current after temperature has stabilized",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Nominal power dissipation at rated current",
          "symbol": "",
          "kind": "electrical",
          "unit": "W",
          "min": null,
          "typ": 0.42,
          "max": null,
          "conditions": "At rated current",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "ºC",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "Operating temperature range",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Continuous operating current",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "% of rated current",
          "min": null,
          "typ": null,
          "max": 80,
          "conditions": "Continuous operation; standard 20% re-rating for continuous operation applies on top of the temperature re-rating curve",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Preheat temperature Ts(min)",
          "symbol": "Ts(min)",
          "kind": "thermal",
          "unit": "°C",
          "min": 150,
          "typ": null,
          "max": null,
          "conditions": "Reflow, Pb-free assembly, preheat",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Preheat temperature Ts(max)",
          "symbol": "Ts(max)",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "Reflow, Pb-free assembly, preheat",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Preheat time (Ts min to max)",
          "symbol": "ts",
          "kind": "timing",
          "unit": "seconds",
          "min": 60,
          "typ": null,
          "max": 180,
          "conditions": "Reflow, Pb-free assembly, preheat from Ts(min) to Ts(max)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Average ramp-up rate (TL to peak)",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C/second",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "Reflow, Pb-free assembly, from liquidus temperature TL to peak",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Ramp-up rate TS(max) to TL",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C/second",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Reflow, Pb-free assembly",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Time at liquidus temperature (tL)",
          "symbol": "tL",
          "kind": "timing",
          "unit": "seconds",
          "min": 60,
          "typ": null,
          "max": 150,
          "conditions": "Reflow, Pb-free assembly, at TL 217°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Peak temperature (TP)",
          "symbol": "TP",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "Reflow, Pb-free assembly; printed 260+0/-5 °C; do not exceed 260°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Time within 5°C of actual peak temperature (tp)",
          "symbol": "tp",
          "kind": "timing",
          "unit": "seconds",
          "min": 10,
          "typ": null,
          "max": 30,
          "conditions": "Reflow, Pb-free assembly",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Ramp-down rate",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C/second",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "Reflow, Pb-free assembly",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Time 25°C to peak temperature",
          "symbol": "",
          "kind": "timing",
          "unit": "minutes",
          "min": null,
          "typ": null,
          "max": 8,
          "conditions": "Reflow, from 25°C to peak temperature TP",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Wave soldering temperature",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "Wave soldering",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Wave soldering time",
          "symbol": "",
          "kind": "timing",
          "unit": "seconds",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "Wave soldering",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "0437003.wr"
  ],
  "discovery_pitch": "0437003.WR (Littelfuse) 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",
    "0437003-wr.kicad_sym",
    "0437003-wr.kicad_mod",
    "0437003-wr.glb",
    "0437003-wr.step",
    "0437003-wr.lbr",
    "docs/hero.png",
    "docs/0437003-wr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "0437003-wr-hero.glb",
    "0437003-wr-hero.overlay.json",
    "0437003-wr-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}