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Ray Set visibility: public 40311ea 17d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "bc556b",
  "title": "BC556B",
  "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",
    "bc556b",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "BC556B",
    "manufacturer": "LGE",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588892868118761472",
    "parts": {
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      "footprint": "bc556b.kicad_mod",
      "model_3d": "bc556b-hero.glb",
      "model_3d_plain": "bc556b-etched.glb",
      "model_3d_step": "bc556b-etched.step",
      "model_3d_step_plain": "bc556b.step",
      "lbr": "bc556b.lbr"
    },
    "distributor_links": {
      "lcsc": "C713616",
      "digikey": "4878-BC556BCT-ND",
      "mouser": "637-BC556B"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T05:15:09Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "4878-BC556BCT-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "637-BC556B",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the PNP device; the emitter-base voltage rating is VEBO = -5 V and the continuous collector current rating is -100 mA."
      },
      {
        "number": "2",
        "name": "BASE",
        "type": "passive",
        "description": "Base terminal; base-emitter saturation voltage VBE(sat) is -1 V max at IC = -100 mA, IB = -5 mA."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal; rated up to VCBO = -80 V (BC556), VCEO = -65 V (BC556), IC = -100 mA continuous, and PC = 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: The datasheet lists the TO-92 pin assignments as a numbered text list (1. EMITTER, 2. BASE, 3. COLLE; Pin types are given as 'passive' because the datasheet does not classify terminals electrically; thi; Pages 2-4 contain only typical characteristic graphs with no text, so no additional pin or package i"
        ],
        "pages_sent": 4,
        "cost_usd": 0.0125,
        "at": "2026-10-18T05:12:06"
      },
      "datasheet": {
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        "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": {
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      "footprint": "viewers/footprint.html"
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    "models_3d": [
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        "file": "bc556b.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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          3.745,
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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": "bc556b-etched.step",
        "role": "eda",
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        "sha256": "32181a0646bf3bc86e311749250b32443783f6c98db374ef5ee1bba8b924ce89",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "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 (BC556)",
          "symbol": "VCBO",
          "kind": "electrical",
          "unit": "V",
          "min": -80,
          "typ": null,
          "max": null,
          "conditions": "IC= -100μA, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage (BC556)",
          "symbol": "VCEO",
          "kind": "electrical",
          "unit": "V",
          "min": -65,
          "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 (BC556)",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": -0.1,
          "conditions": "VCB=-70 V, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter cut-off current (BC556)",
          "symbol": "IEBO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": -0.1,
          "conditions": "VEB= -5 V, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BC556B/BC557B/BC558B)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 180,
          "typ": null,
          "max": 460,
          "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 (BC556)",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -80,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter voltage (BC556)",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -65,
          "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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    "viewers",
    "readme",
    "breadcrumbs",
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  "discovery_triggers": [
    "bc556b"
  ],
  "discovery_pitch": "BC556B (LGE) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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    "bc556b.lbr",
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  "visibility": {
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}