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Ray Set visibility: public 1706fc2 15h ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "bc548",
  "title": "BC548",
  "brief": "Changjiang Electronics Tech (CJ) Bipolar Transistors - BJT, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistors",
    "subcategory": "Bipolar Transistors - BJT",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/faaa751c764544419d76cb9c9d725e01.pdf",
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      "lbr": "bc548.lbr"
    },
    "distributor_links": {
      "lcsc": "C36611",
      "mouser": "512-BC548"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T01:21:06Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "512-BC548",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector of the NPN transistor; for BC548 the datasheet gives VCBO 30 V, VCEO 30 V, and continuous collector current IC 0.1 A, with collector power dissipation PC 625 mW."
      },
      {
        "number": "2",
        "name": "BASE",
        "type": "input",
        "description": "Base of the NPN transistor; the datasheet lists the BC548 emitter-base voltage VEBO as 5 V and gives VBE(sat) 1.1 V at IC=100 mA, IB=5 mA."
      },
      {
        "number": "3",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter of the NPN transistor; the datasheet lists the BC548 emitter-base voltage VEBO as 5 V (the emitter-base breakdown voltage V(BR)EBO minimum is 5 V at IE=10 μA)."
      }
    ],
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        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet covers the BC546/BC547/BC548 family in one document; the pin descriptions use the BC54; The datasheet gives only the pin order as text (1. COLLECTOR, 2. BASE, 3. EMITTER) with no dimension"
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        "cost_usd": 0.0119,
        "at": "2026-11-05T01:20:59"
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        "pages": 2,
        "sha256": "068ebd7ca4658019",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
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        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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    "viewers": {
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        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-11-05",
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  "metadata": {
    "specs": {
      "Manufacturer": "Changjiang Electronics Tech (CJ)",
      "Package": "TO-92",
      "Category": "Transistors",
      "Pins": "3"
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    "characteristics": {
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      "rows": [
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          "name": "Collector-base voltage (BC548)",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "Ta=25℃",
          "source_page": 1,
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        },
        {
          "name": "Collector-emitter voltage (BC548)",
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          "unit": "V",
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          "conditions": "Ta=25℃",
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        },
        {
          "name": "Emitter-base voltage (BC548)",
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          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Ta=25℃",
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        },
        {
          "name": "Collector current-continuous",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "Ta=25℃",
          "source_page": 1,
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        },
        {
          "name": "Collector power dissipation",
          "symbol": "PC",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
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          "conditions": "Ta=25℃",
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        {
          "name": "Junction temperature",
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        {
          "name": "Storage temperature",
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          "unit": "℃",
          "min": -55,
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          "conditions": "",
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        },
        {
          "name": "Thermal resistance junction to ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "℃/W",
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        },
        {
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          "conditions": "IE=10μA,IC=0",
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        {
          "name": "Collector cut-off current (BC548)",
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          "kind": "electrical",
          "unit": "μA",
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          "name": "DC current gain",
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          "conditions": "VCE=5V, IC=2mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
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          "kind": "electrical",
          "unit": "V",
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          "typ": null,
          "max": 0.3,
          "conditions": "IC=100mA,IB=5mA",
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        {
          "name": "Base-emitter saturation voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
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          "min": null,
          "typ": null,
          "max": 1.1,
          "conditions": "IC=100mA,IB=5mA",
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          "source": "datasheet"
        },
        {
          "name": "Base-emitter voltage",
          "symbol": "VBE",
          "kind": "electrical",
          "unit": "V",
          "min": 0.58,
          "typ": null,
          "max": 0.7,
          "conditions": "VCE=5V, IC=2mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter voltage",
          "symbol": "VBE",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.75,
          "max": null,
          "conditions": "VCE=5V, IC=10mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector output capacitance",
          "symbol": "Cob",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 4.5,
          "max": null,
          "conditions": "VCB=10V,IE=0, f=1MHz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MH",
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          "max": null,
          "conditions": "VCE=5V,IC=10mA, f=100MHz",
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  "discovery_triggers": [
    "bc548"
  ],
  "discovery_pitch": "BC548 (Changjiang Electronics Tech (CJ)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}