SMCJ188A

{
  "schema_version": 1,
  "type": "component",
  "slug": "smcj188a",
  "title": "SMCJ188A",
  "brief": "UMW TVS, SMC. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "circuit protection",
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  "component": {
    "mpn": "SMCJ188A",
    "manufacturer": "UMW",
    "package": "SMC",
    "pin_count": 2,
    "category": "Circuit Protection",
    "subcategory": "TVS",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/ed1bc89f36386d5d2b8b06ee8da21c4f.pdf",
    "parts": {
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      "lbr": "smcj188a.lbr"
    },
    "distributor_links": {
      "lcsc": "C2758556"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T21:59:59Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Cathode",
        "type": "passive",
        "description": "Cathode terminal of the unidirectional SMCJ188A TVS diode, marked by the color band on the case; VWM 188V, VBR 209V min to 231V max, VC 328V at IPPM 4.60A."
      },
      {
        "number": "2",
        "name": "Anode",
        "type": "passive",
        "description": "Anode terminal of the unidirectional SMCJ188A TVS diode, the end opposite the color band, with 1500W peak pulse power (10/1000µs) capability."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet pinning section shows only Cathode and Anode symbols for the SMC package and prints no; Pin electrical type is not stated in the datasheet. Both terminals are set to passive, the usual KiC"
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        "pages_sent": 7,
        "cost_usd": 0.0557,
        "at": "2026-10-22T21:59:49"
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      "datasheet": {
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        "pages": 7,
        "sha256": "887bcda70cdf8617",
        "source_tier": "lcsc"
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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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        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          8,
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          2.31
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "30dab4c2e22239b7e3694a4d45304e04255c6b70a79d28e9c34c6072ba647991",
        "checked": "2026-10-22",
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        "sha256": "1f1289e4d67aa52ecd8f6a385a961e6ddafa1a33131c352898a6c9ebc1462c18",
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    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "UMW",
      "Package": "SMC",
      "Category": "Circuit Protection",
      "Pins": "2"
    },
    "appearance": {
      "contacts": {
        "quote": "(2) Mounted on 0.31 x 0.31” (8.0 x 8.0mm) copper pads to each terminal.",
        "page": 1,
        "doc": "ds.pdf",
        "material": "copper"
      },
      "version": 1,
      "datasheet_sha256": "887bcda70cdf861736dfce237868a327d75d2a4005513215af9292614559bda1"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "887bcda70cdf861736dfce237868a327d75d2a4005513215af9292614559bda1",
      "rows": [
        {
          "name": "Breakdown Voltage (min)",
          "symbol": "VBR",
          "kind": "electrical",
          "unit": "V",
          "min": 209,
          "typ": null,
          "max": 231,
          "conditions": "at IT = 1.0 mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Test Current",
          "symbol": "IT",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Working Peak Reverse Voltage",
          "symbol": "VWM",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": 188,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Reverse Leakage",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "at VWM",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Peak Pulse Surge Current",
          "symbol": "IPPM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 4.6,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Clamping Voltage",
          "symbol": "VC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 328,
          "conditions": "at IPPM",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak Pulse Power Dissipation",
          "symbol": "PPPM",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": 1500,
          "typ": null,
          "max": null,
          "conditions": "Minimum 1500; non-repetitive, 1ms",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak Forward Surge Current",
          "symbol": "IFSM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "per Fig. 5",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Maximum Instantaneous Forward Voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 3.5,
          "conditions": "at 50.0A, unidirectional only",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction and Storage Temperature Range",
          "symbol": "TJ,TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance, Junction to Ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 75,
          "max": null,
          "conditions": "Mounted on minimum recommended pad layout",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
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  "discovery_triggers": [
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  ],
  "discovery_pitch": "SMCJ188A (UMW) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}