main
Ray Set visibility: public c4a6530 5d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "smf78ca",
  "title": "SMF78CA",
  "brief": "Liown Electrostatic And Surge Protection (TVS/ESD), SOD-123FL. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "tvs-fuse-board level protection",
    "smf78ca",
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    "extractor-text"
  ],
  "component": {
    "mpn": "SMF78CA",
    "manufacturer": "Liown",
    "package": "SOD-123FL",
    "pin_count": 2,
    "category": "TVS/Fuse/Board Level Protection",
    "subcategory": "Electrostatic And Surge Protection (TVS/ESD)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b3a71b5091b8089da229a4268bc0e803.pdf",
    "parts": {
      "symbol": "smf78ca.kicad_sym",
      "footprint": "smf78ca.kicad_mod",
      "model_3d": "smf78ca-hero.glb",
      "model_3d_step": "smf78ca.step",
      "lbr": "smf78ca.lbr",
      "model_3d_plain": "smf78ca.glb"
    },
    "distributor_links": {
      "lcsc": "C53278404",
      "digikey": "2721-SMF78CATR-ND",
      "mouser": "576-SMF78CA"
    },
    "distributor_check": {
      "checked_at": "2026-11-04T18:20:25Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2721-SMF78CATR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "576-SMF78CA",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "1",
        "type": "passive",
        "description": "Terminal 1 of an unpolarised fuse; either orientation."
      },
      {
        "number": "2",
        "name": "2",
        "type": "passive",
        "description": "Terminal 2 of an unpolarised fuse; either orientation."
      }
    ],
    "provenance": {
      "extractor": "extract_pins",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins",
        "primary_model": "two-terminal convention",
        "primary_mode": "convention",
        "consensus_model": null,
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 6,
        "cost_usd": 0.0013,
        "at": "2026-11-04T18:20:19"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/b3a71b5091b8089da229a4268bc0e803.pdf",
        "pages": 6,
        "sha256": "1a9bdebdaaf8c693",
        "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": "smf78ca.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.5,
          1.6,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "132323445e3d1f9231e81c083cd88a33cd204dd8b96063bb2ed1f3ab4470c7e7",
        "checked": "2026-11-04",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "SOD-123FL",
      "source_page": 5,
      "D": {
        "nom_mm": 2.8,
        "range_mm": [
          2.6,
          3
        ]
      },
      "E1": {
        "nom_mm": 1.8,
        "range_mm": [
          1.6,
          2
        ]
      },
      "E": {
        "nom_mm": 3.7,
        "range_mm": [
          3.5,
          3.9
        ]
      },
      "A": {
        "nom_mm": 1.125,
        "range_mm": [
          0.9,
          1.35
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "smf78ca.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Liown",
      "Package": "SOD-123FL",
      "Category": "TVS/Fuse/Board Level Protection",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "1a9bdebdaaf8c69344e70c87c4090d0314c033c32bf16280a1129aa1484b5675",
      "rows": [
        {
          "name": "Breakdown voltage (min), bidirectional SMF78CA",
          "symbol": "VB",
          "kind": "electrical",
          "unit": "V",
          "min": 86.7,
          "typ": null,
          "max": null,
          "conditions": "@ IT = 1 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Breakdown voltage (max), bidirectional SMF78CA",
          "symbol": "VB",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 95.8,
          "conditions": "@ IT = 1 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum clamping voltage, bidirectional SMF78CA",
          "symbol": "VC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 126,
          "conditions": "@ IPP = 1.6 A",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Reverse leakage current, bidirectional SMF78CA",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "@ VR = 78 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Peak pulse power dissipation, 10/1000 µs waveform",
          "symbol": "PPPM",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "10/1000μs waveform (Note1, Note2, Fig.1)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak pulse power, 8/20 µs waveform",
          "symbol": "PPPM",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1000,
          "conditions": "tp=8/20μs waveform",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Steady state power dissipation",
          "symbol": "PM(AV)",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "TL=75℃ (Fig.5)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak forward surge current",
          "symbol": "IFSM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "8.3ms single half sine-wave superimposed on rated load, (JEDEC Method) (Note3, Fig.6)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating junction and storage temperature range",
          "symbol": "TJ、TSTG",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Typical thermal resistance, junction to lead",
          "symbol": "RθJL",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Typical thermal resistance, junction to ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": 220,
          "max": null,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "smf78ca"
  ],
  "discovery_pitch": "SMF78CA (Liown) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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    "smf78ca.lbr",
    "docs/hero.png",
    "docs/smf78ca-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "smf78ca-hero.glb",
    "smf78ca-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}