SMPC51AN-M3

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  "type": "component",
  "slug": "smpc51an-m3",
  "title": "SMPC51AN-M3",
  "brief": "Vishay Intertech ESD And Surge Protection (TVS/ESD), TO-277A. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "SMPC51AN-M3",
    "manufacturer": "Vishay Intertech",
    "package": "TO-277A",
    "pin_count": 3,
    "category": "Circuit Protection",
    "subcategory": "ESD And Surge Protection (TVS/ESD)",
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    "distributor_links": {
      "lcsc": "C1974303"
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      "checked_at": "2026-10-16T22:09:52Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
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      "mouser": {
        "pn": null,
        "status": "no match"
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    },
    "pins": [
      {
        "number": "1",
        "name": "Anode 1",
        "type": "passive",
        "description": "Anode terminal 1 of the SMPCxxAN uni-directional TVS; the two anode terminals are connected together, and the datasheet's electrical characteristics apply only when both identical-polarity terminals are connected."
      },
      {
        "number": "2",
        "name": "Anode 2",
        "type": "passive",
        "description": "Anode terminal 2 of the SMPCxxAN uni-directional TVS; connect it with anode 1, as the datasheet's electrical characteristics apply only when both identical-polarity terminals are connected."
      },
      {
        "number": "3",
        "name": "Cathode",
        "type": "passive",
        "description": "Cathode (K) of the SMPCxxAN, which the datasheet table lists as the cathode on the heatsink; the page 1 drawing labels it 3 and the package outline marks the cathode band."
      }
    ],
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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      "pins": {
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        "described": 3,
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        "refuses_to_fabricate": true
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        "centre_offset_mm": 0,
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  "metadata": {
    "specs": {
      "Manufacturer": "Vishay Intertech",
      "Package": "TO-277A",
      "Category": "Circuit Protection",
      "Pins": "3"
    },
    "appearance": {
      "contacts": {
        "quote": "Terminals: matte tin plated leads, solderable per J-STD-002 and JESD 22-B102",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
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      "version": 1,
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    "characteristics": {
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      "source": "datasheet",
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        {
          "name": "Breakdown voltage (test current 1.0 mA)",
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          "typ": null,
          "max": 62.7,
          "conditions": "at IT = 1.0 mA",
          "source_page": 2,
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        },
        {
          "name": "Maximum reverse leakage current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "max": 1,
          "conditions": "at VWM",
          "source_page": 2,
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          "name": "Maximum peak pulse surge current",
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          "kind": "electrical",
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          "conditions": "Surge current waveform per fig. 3 and derated per fig. 2",
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          "name": "Maximum clamping voltage at IPPM",
          "symbol": "VC",
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        {
          "name": "Peak power dissipation",
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          "max": 1500,
          "conditions": "10/1000 µs waveform (fig. 3)",
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          "max": 1.25,
          "conditions": "TA = 25 °C",
          "source_page": 1,
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          "max": 100,
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          "source_page": 3,
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        },
        {
          "name": "Thermal resistance junction-to-mount",
          "symbol": "RJM",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 2.5,
          "max": 3,
          "conditions": "JEDEC 51-14 Transient Dual Interface Test Method (TDIM)",
          "source_page": 3,
          "source": "datasheet"
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  "discovery_pitch": "SMPC51AN-M3 (Vishay Intertech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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