BC556BBK

{
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  "type": "component",
  "slug": "bc556bbk",
  "title": "BC556BBK",
  "brief": "DIOTEC 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",
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  "component": {
    "mpn": "BC556BBK",
    "manufacturer": "DIOTEC",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
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      "lbr": "bc556bbk.lbr"
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      "lcsc": "C3201547",
      "digikey": "4878-BC556BBK-ND",
      "mouser": "637-BC556BBK"
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    "distributor_check": {
      "checked_at": "2026-10-10T00:29:16Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "4878-BC556BBK-ND",
        "status": "found",
        "lifecycle": "Active"
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        "pn": "637-BC556BBK",
        "status": "found"
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    "pins": [
      {
        "number": "1",
        "name": "C",
        "type": "passive",
        "description": "Collector of the PNP transistor; maximum collector current is -100 mA DC (-200 mA peak) and VCEO is -65 V for the BC556."
      },
      {
        "number": "2",
        "name": "B",
        "type": "passive",
        "description": "Base of the PNP transistor; peak base current is limited to 200 mA and VEBO to 5 V."
      },
      {
        "number": "3",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the PNP transistor; peak emitter current is limited to 200 mA."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The BK suffix means bulk packing with 1.27 mm lead pitch. The datasheet pinout (C=1, B=2, E=3) comes",
          "vision extraction: provenance cannot be text-verified; needs consensus"
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        "cost_usd": 0.2715,
        "at": "2026-10-10T00:26:58"
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      "datasheet": {
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        "pages": 4,
        "sha256": "f2051b60b559de98",
        "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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        "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": "2026-10-10",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "DIOTEC",
      "Package": "TO-92",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "f2051b60b559de98",
      "rows": [
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          "name": "DC current gain, Group B, IC = -2 mA",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 200,
          "typ": null,
          "max": 450,
          "conditions": "VCE = -5 V, IC = -2 mA, Group B",
          "source_page": 2,
          "source": "datasheet"
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        {
          "name": "Collector-Emitter cutoff current, Tj = 25°C, BC556",
          "symbol": "ICES",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 0.2,
          "max": 15,
          "conditions": "VCE = -80 V, B-E short, BC556",
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          "name": "Collector-Emitter cutoff current, Tj = 125°C, BC556",
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          "max": 4,
          "conditions": "Tj = 125°C, VCE = -80 V, B-E short, BC556",
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          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter saturation voltage, 10 mA / 0.5 mA",
          "symbol": "VCEsat",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 80,
          "max": 300,
          "conditions": "IC = -10 mA, IB = -0.5 mA",
          "source_page": 2,
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          "name": "Collector-Emitter saturation voltage, 100 mA / 5 mA",
          "symbol": "VCEsat",
          "kind": "electrical",
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          "min": null,
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          "name": "Base-Emitter voltage, 2 mA",
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          "name": "Base-Emitter voltage, 10 mA",
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          "conditions": "VCE = -5 V, IC = -10 mA",
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          "kind": "electrical",
          "unit": "pF",
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          "typ": 3.5,
          "max": 6,
          "conditions": "VCB = -10 V, IE = ie = 0, f = 1 MHz",
          "source_page": 2,
          "source": "datasheet"
        },
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          "name": "Noise figure, BC556 to BC558",
          "symbol": "F",
          "kind": "electrical",
          "unit": "dB",
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          "max": 10,
          "conditions": "VCE = -5 V, IC = -200 µA, RG = 2 kΩ, f = 1 kHz, Δf = 200 Hz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter voltage, E-B short (BC556)",
          "symbol": "VCES",
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          "unit": "V",
          "min": null,
          "typ": null,
          "max": 80,
          "conditions": "E-B short",
          "source_page": 1,
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        },
        {
          "name": "Collector-Emitter voltage, B open (BC556)",
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          "unit": "V",
          "min": null,
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          "max": 65,
          "conditions": "B open",
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          "name": "Collector-Base voltage, E open (BC556)",
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          "conditions": "E open",
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        },
        {
          "name": "Emitter-Base voltage",
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          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "C open",
          "source_page": 1,
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        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "Valid if leads kept at TA at 2 mm distance from case",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector current DC",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "DC",
          "source_page": 1,
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        },
        {
          "name": "Peak collector current",
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          "unit": "mA",
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          "typ": null,
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          "conditions": "",
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        {
          "name": "Peak base current",
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          "min": null,
          "typ": null,
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          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Peak emitter current",
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          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
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          "unit": "°C",
          "min": -55,
          "typ": null,
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          "conditions": "",
          "source_page": 1,
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        },
        {
          "name": "Storage temperature",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Typical thermal resistance junction to ambient",
          "symbol": "RthA",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": 200,
          "max": null,
          "conditions": "Valid if leads kept at ambient temperature at 2 mm distance from case",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_pitch": "BC556BBK (DIOTEC) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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