SMCJ40A

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  "schema_version": 1,
  "type": "component",
  "slug": "smcj40a",
  "title": "SMCJ40A",
  "brief": "hongjiacheng ESD And Surge Protection (TVS/ESD), SMC(DO-214AB). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.",
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    "manufacturer": "hongjiacheng",
    "package": "SMC(DO-214AB)",
    "pin_count": 2,
    "category": "Circuit Protection",
    "subcategory": "ESD And Surge Protection (TVS/ESD)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/63434cf44d11833c6d7a145dda2ad39c.pdf",
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    "distributor_links": {
      "lcsc": "C42371540",
      "digikey": "SMCJ40ALFTR-ND",
      "mouser": "652-SMCJ40A"
    },
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        "lifecycle": "Active"
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      "mouser": {
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    },
    "pins": [
      {
        "number": "1",
        "name": "K",
        "type": "passive",
        "description": "Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint."
      },
      {
        "number": "2",
        "name": "A",
        "type": "passive",
        "description": "Anode."
      }
    ],
    "provenance": {
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        "at": "2026-10-21T05:26:11"
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        "pages": 5,
        "sha256": "5cbe7c34174b4905",
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "hongjiacheng",
      "Package": "SMC(DO-214AB)",
      "Category": "Circuit Protection",
      "Pins": "2"
    },
    "appearance": {
      "contacts": {
        "quote": "•Matte tin lead–free Plated •Halogen free and RoHS compliant",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
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    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
        {
          "name": "Breakdown voltage (unidirectional SMCJ40A, 5% tolerance)",
          "symbol": "VBR",
          "kind": "electrical",
          "unit": "V",
          "min": 44.4,
          "typ": null,
          "max": 49.1,
          "conditions": "@IT = 1 mA (test current)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum clamping voltage",
          "symbol": "VC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 64.5,
          "conditions": "@IPP = 23.3 A",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reverse leakage current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "@VRWM = 40 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reverse stand-off voltage",
          "symbol": "VRWM",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "Unidirectional SMCJ40A (bidirectional SMCJ40CA not covered)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum instantaneous forward voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 3.5,
          "conditions": "at 25A, unidirectional only (Note 4: VF<3.5V for VBR<200V)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak pulse power dissipation",
          "symbol": "PPPM",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1500,
          "conditions": "10/1000µs waveform (Fig.1) (Note 1), (Note 2)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation on infinite heat sink",
          "symbol": "PM(AV)",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 6.5,
          "conditions": "TL=75℃",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak forward surge current",
          "symbol": "IFSM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "8.3ms single half sine wave (Note 3)",
          "source_page": 1,
          "source": "datasheet"
        },
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          "name": "Operating junction and storage temperature range",
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          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Typical thermal resistance junction to lead",
          "symbol": "RθJ-L",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "junction to lead, typical",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Typical thermal resistance junction to ambient",
          "symbol": "RθJ-A",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": 75,
          "max": null,
          "conditions": "junction to ambient, typical; mounted on 5.0mm x 5.0mm copper pads to each terminal (Note 2)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Typical maximum temperature coefficient of VBR",
          "symbol": "ΔVBR",
          "kind": "temperature_coefficient",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "ΔVBR = 0.1% × VBR@25℃ × ΔT (typical maximum, as printed)",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_pitch": "SMCJ40A (hongjiacheng) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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