MJD31C

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  "slug": "mjd31c",
  "title": "MJD31C",
  "brief": "Changjing Bipolar (BJT), TO-252-2L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
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  "component": {
    "mpn": "MJD31C",
    "manufacturer": "Changjing",
    "package": "TO-252-2L",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586176002301444096",
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      "lbr": "mjd31c.lbr"
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    "distributor_links": {
      "lcsc": "C27596",
      "mouser": "863-MJD31C"
    },
    "distributor_check": {
      "checked_at": "2026-10-09T12:35:30Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "863-MJD31C",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BASE",
        "type": "input",
        "description": "Base terminal of the NPN transistor; the datasheet gives no separate base current limit, and the emitter-base breakdown voltage V(BR)EBO is specified at 5 V minimum."
      },
      {
        "number": "2",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal of the NPN transistor, rated for a collector-base voltage VCBO of 100 V, a collector-emitter voltage VCEO of 100 V, and continuous collector current IC of 3 A."
      },
      {
        "number": "3",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the NPN transistor, with the emitter-base voltage VEBO rated at 5 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Package naming mismatch: the datasheet calls the package TO-252-2L, but the pinout lists three leads; The datasheet has no pad or lead-layout drawing for the TO-252 package. The pin-to-function mapping ; Variant note: the MJD31C orderable part with no suffix is the lead-formed surface-mount version in p"
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        "cost_usd": 0.0251,
        "at": "2026-10-09T12:33:03"
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        "pages": 3,
        "sha256": "943fe0022b98e97a",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
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          6.5,
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3eb4c99603a4fe837c2fe9308bc174769ded87a785a0df48d2dc441432ee8b4c",
        "checked": "2026-10-09",
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        "checked": "2026-10-16",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Changjing",
      "Package": "TO-252-2L",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "943fe0022b98e97a",
      "rows": [
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          "name": "Collector-base breakdown voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "IC= 1mA, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage",
          "symbol": "VCEO(sus)",
          "kind": "electrical",
          "unit": "V",
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          "typ": null,
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        {
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        {
          "name": "Collector cut-off current",
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          "kind": "electrical",
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          "typ": null,
          "max": 20,
          "conditions": "VCE=100V, VEB=0",
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        },
        {
          "name": "Collector cut-off current",
          "symbol": "ICEO",
          "kind": "electrical",
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          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VCE= 60V, IB= 0",
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        {
          "name": "Emitter cut-off current",
          "symbol": "IEBO",
          "kind": "electrical",
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          "typ": null,
          "max": 1,
          "conditions": "VEB=5V, IC=0",
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        },
        {
          "name": "DC current gain",
          "symbol": "hFE(1)",
          "kind": "electrical",
          "unit": "",
          "min": 25,
          "typ": null,
          "max": null,
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          "source_page": 1,
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          "unit": "",
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          "typ": null,
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        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHZ",
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          "typ": null,
          "max": null,
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        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "V",
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          "typ": null,
          "max": 1.2,
          "conditions": "IC=3A, IB=0.375A",
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        },
        {
          "name": "Base-emitter voltage",
          "symbol": "VBE(on)",
          "kind": "electrical",
          "unit": "V",
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          "typ": null,
          "max": 1.8,
          "conditions": "VCE= 4V, IC=3A",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-Base Voltage",
          "symbol": "VCBO",
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          "unit": "V",
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          "typ": null,
          "max": 100,
          "conditions": "",
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        {
          "name": "Collector-Emitter Voltage",
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        },
        {
          "name": "Emitter-Base Voltage",
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          "typ": null,
          "max": 5,
          "conditions": "",
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        {
          "name": "Collector Current -Continuous",
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          "unit": "A",
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          "typ": null,
          "max": 3,
          "conditions": "",
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        },
        {
          "name": "Collector Power Dissipation",
          "symbol": "PC",
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          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1.25,
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        {
          "name": "Junction Temperature",
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        {
          "name": "Storage Temperature",
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          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_pitch": "MJD31C (Changjing) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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