main
Ray Set visibility: public 7b0e1f4 17d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "bc557c",
  "title": "BC557C",
  "brief": "LGE Bipolar (BJT), TO-92. 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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    "transistors-thyristors",
    "bc557c",
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    "extractor-text"
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  "component": {
    "mpn": "BC557C",
    "manufacturer": "LGE",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588892869373939712",
    "parts": {
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      "footprint": "bc557c.kicad_mod",
      "model_3d": "bc557c-hero.glb",
      "model_3d_plain": "bc557c-etched.glb",
      "model_3d_step": "bc557c-etched.step",
      "model_3d_step_plain": "bc557c.step",
      "lbr": "bc557c.lbr"
    },
    "distributor_links": {
      "lcsc": "C713618"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T08:49:57Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the PNP transistor; emitter-base breakdown is specified at VEBO = -5 V (IE = -100 µA, IC = 0)."
      },
      {
        "number": "2",
        "name": "BASE",
        "type": "passive",
        "description": "Base terminal of the PNP transistor, driven relative to the emitter; continuous collector current is limited to -100 mA and VCE(sat) is specified at IC = -100 mA, IB = -5 mA."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal of the PNP transistor; for the BC557 column the collector-emitter breakdown is -45 V (IC = -2 mA, IB = 0) and collector power dissipation is 625 mW."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin assignment is taken from the TO-92 label in the text ('1. EMITTER 2. BASE 3. COLLECTOR'); the da; The datasheet covers the BC556/557/558 family. Pin descriptions cite the BC557 column because BC557C; The DC current gain table for BC557C (hFE 420 to 800 range) is garbled in the extracted text and was"
        ],
        "pages_sent": 4,
        "cost_usd": 0.0207,
        "at": "2026-10-18T08:48:37"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588892869373939712",
        "pages": 4,
        "sha256": "3f07b60d7056ca34",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
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    "models_3d": [
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        "file": "bc557c.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "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": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bc557c-etched.step",
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        "centre_offset_mm": 0.542,
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        "sha256": "3ee843a9eb81404f72c5d7feb8b33cfa547aa3c330341bf6a2087b02316b40dc",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "LGE",
      "Package": "TO-92",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "3f07b60d7056ca349e19f3f0048019c431f20a051e64bbf1dcc5be8e6ecb6f87",
      "rows": [
        {
          "name": "Collector-base breakdown voltage (BC557)",
          "symbol": "VCBO",
          "kind": "electrical",
          "unit": "V",
          "min": -50,
          "typ": null,
          "max": null,
          "conditions": "IC= -100μA, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage (BC557)",
          "symbol": "VCEO",
          "kind": "electrical",
          "unit": "V",
          "min": -45,
          "typ": null,
          "max": null,
          "conditions": "IC= -2mA, IB=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base breakdown voltage",
          "symbol": "VEBO",
          "kind": "electrical",
          "unit": "V",
          "min": -5,
          "typ": null,
          "max": null,
          "conditions": "IE= -100μA, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector cut-off current (BC557, base open)",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": -0.1,
          "conditions": "VCB= -45 V, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector cut-off current (BC557, base open, emitter-collector)",
          "symbol": "ICEO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": -0.1,
          "conditions": "VCE= -40 V, IB=0",
          "source_page": 1,
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        },
        {
          "name": "Emitter cut-off current",
          "symbol": "IEBO",
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          "unit": "μA",
          "min": null,
          "typ": null,
          "max": -0.1,
          "conditions": "VEB= -5 V, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BC557C, lower limit)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 420,
          "typ": null,
          "max": null,
          "conditions": "VCE=-5V, IC= -2mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BC557C, upper limit)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": null,
          "typ": null,
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          "conditions": "VCE=-5V, IC= -2mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -0.65,
          "conditions": "IC=-100mA, IB= -5mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter saturation voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -1,
          "conditions": "IC= -100mA, IB=-5mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "VCE= -5V, IC= -10mA, f = 100MHz",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-base voltage (BC557)",
          "symbol": "VCBO",
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          "min": null,
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        },
        {
          "name": "Collector-emitter voltage (BC557)",
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          "unit": "V",
          "min": null,
          "typ": null,
          "max": -45,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -5,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector current (continuous)",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector power dissipation",
          "symbol": "PC",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 625,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
    "bc557c"
  ],
  "discovery_pitch": "BC557C (LGE) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "visibility": {
    "public": true
  }
}