SMD1812P125TF

{
  "schema_version": 1,
  "type": "component",
  "slug": "smd1812p125tf",
  "title": "SMD1812P125TF",
  "brief": "RUILON Shenzhen Ruilongyuan Elec Resettable Fuses, 1812. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "mpn": "SMD1812P125TF",
    "manufacturer": "RUILON Shenzhen Ruilongyuan Elec",
    "package": "1812",
    "pin_count": 2,
    "category": "Circuit Protection",
    "subcategory": "Resettable Fuses",
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      "lbr": "smd1812p125tf.lbr"
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    "distributor_links": {
      "lcsc": "C21001"
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      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
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      "mouser": {
        "pn": null,
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    },
    "pins": [
      {
        "number": "1",
        "name": "1",
        "type": "passive",
        "description": "One terminal of the resettable PTC fuse, which is non-polarized and interchangeable with the other terminal; Ihold 1.25 A, Itrip 2.5 A, Vmax 16 VDC, Imax 8 A."
      },
      {
        "number": "2",
        "name": "2",
        "type": "passive",
        "description": "Other terminal of the resettable PTC fuse, which is non-polarized and interchangeable with the other terminal; Ihold 1.25 A, Itrip 2.5 A, Vmax 16 VDC, Imax 8 A."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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        "cost_usd": 0.2038,
        "at": "2026-10-17T22:11:11"
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        "sha256": "17f9c523d0f567cd",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
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        "refuses_to_fabricate": true
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d1b4b1d4c9a87016b0aa39307e23b8883f5f5b5f1a1a15cdd44a9374cae7e4b4",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "RUILON Shenzhen Ruilongyuan Elec",
      "Package": "1812",
      "Category": "Circuit Protection",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
        {
          "name": "Hold current (maximum current without tripping, 25°C still air)",
          "symbol": "Ihold",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 1.25,
          "conditions": "25°C still air",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Trip current (minimum current at which device always trips, 25°C still air)",
          "symbol": "Itrip",
          "kind": "electrical",
          "unit": "A",
          "min": 2.5,
          "typ": null,
          "max": null,
          "conditions": "25°C still air",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum operating voltage",
          "symbol": "Vmax",
          "kind": "absolute_maximum",
          "unit": "VDC",
          "min": null,
          "typ": null,
          "max": 16,
          "conditions": "at rated current Imax",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum fault current",
          "symbol": "Imax",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 35,
          "conditions": "at rated voltage Vmax",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum time to trip",
          "symbol": "Tmax",
          "kind": "timing",
          "unit": "s",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "at 8 A",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation in tripped state",
          "symbol": "Pd",
          "kind": "electrical",
          "unit": "W",
          "min": null,
          "typ": 0.8,
          "max": null,
          "conditions": "tripped state, 25°C still air, at rated voltage",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Minimum resistance prior to tripping at 25°C",
          "symbol": "Rimin",
          "kind": "electrical",
          "unit": "Ω",
          "min": 0.05,
          "typ": null,
          "max": null,
          "conditions": "25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum resistance one hour post reflow",
          "symbol": "R1max",
          "kind": "electrical",
          "unit": "Ω",
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          "typ": null,
          "max": 0.14,
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          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Resistance change, passive aging",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": 5,
          "max": null,
          "conditions": "+85℃, 1000 hrs; printed ±5% typical",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Resistance change, humidity aging",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": 5,
          "max": null,
          "conditions": "+85℃, 85%R.H., 168 hours; printed ±5% typical",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Resistance change, thermal shock",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": 33,
          "max": null,
          "conditions": "+85℃ to -40℃, 20 times; printed ±33% typical",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Ambient operating temperature",
          "symbol": "Ta",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "ambient operating conditions",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Maximum surface temperature in tripped state",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 125,
          "conditions": "device in tripped state",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_pitch": "SMD1812P125TF (RUILON Shenzhen Ruilongyuan Elec) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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