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Ray Set visibility: public a8e5a0e 8d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "bc558a",
  "title": "BC558A",
  "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",
  "tags": [
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    "extractor-text"
  ],
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    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
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      "model_3d_step_plain": "bc558a.step",
      "lbr": "bc558a.lbr"
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    "distributor_links": {
      "lcsc": "C3201581"
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      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
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      "mouser": {
        "pn": null,
        "status": "quota"
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    "pins": [
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        "name": "C",
        "type": "passive",
        "description": "Collector of the PNP transistor; max -VCEO 30 V, -VCBO 30 V and DC collector current -IC 100 mA (200 mA peak) for BC558."
      },
      {
        "number": "2",
        "name": "B",
        "type": "passive",
        "description": "Base of the PNP transistor; peak base current -IBM 200 mA."
      },
      {
        "number": "3",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the PNP transistor; max -VEBO 5 V and peak emitter current IEM 200 mA."
      }
    ],
    "provenance": {
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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: Pin assignment (C=1, B=2, E=3) is read from the page 1 schematic symbol labels (B (2), E (3), C (1))",
          "vision extraction: provenance cannot be text-verified; needs consensus"
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        "cost_usd": 0.2643,
        "at": "2026-10-18T18:04:14"
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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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        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-10-18",
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        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  "metadata": {
    "specs": {
      "Manufacturer": "DIOTEC",
      "Package": "TO-92",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "appearance": {
      "contacts": {
        "quote": "affect human life or health, user shall contact in advance Diotec Semiconductor AG's Managing Board (Heitersheim, Germany) to",
        "page": 4,
        "doc": "ds.pdf",
        "plating": "silver"
      },
      "version": 1,
      "datasheet_sha256": "f2051b60b559de98bf9366fa954895ee3284c3957486290cf93ab62762cbb6fb"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "f2051b60b559de98bf9366fa954895ee3284c3957486290cf93ab62762cbb6fb",
      "rows": [
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          "name": "Collector-Emitter voltage (BC558/559 column)",
          "symbol": "VCES",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "E-B short; TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
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          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "E open; TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-Base voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "C open; TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "TA = 25°C; leads kept at TA at 2 mm from case",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector current DC",
          "symbol": "IC",
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          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "DC; TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak collector current",
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          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak base current",
          "symbol": "IBM",
          "kind": "absolute_maximum",
          "unit": "mA",
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          "typ": null,
          "max": 200,
          "conditions": "TA = 25°C",
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          "source": "datasheet"
        },
        {
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          "symbol": "IEM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
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          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain, Group A",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 110,
          "typ": null,
          "max": 220,
          "conditions": "- VCE = - 5 V, IC = - 2 mA, Group A",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter cutoff current (BC558/559)",
          "symbol": "ICES",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 0.2,
          "max": 15,
          "conditions": "- VCE = 30 V, B-E short",
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          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter cutoff current (BC558/559), Tj = 125°C",
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          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "- VCE = 30 V, B-E short, Tj = 125°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter saturation voltage",
          "symbol": "VCEsat",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 80,
          "max": 250,
          "conditions": "- IC = 10 mA, - IB = 0.5 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter saturation voltage",
          "symbol": "VCEsat",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 300,
          "max": 650,
          "conditions": "- IC = 100 mA, - IB = 5 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter voltage",
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          "kind": "electrical",
          "unit": "mV",
          "min": 600,
          "typ": null,
          "max": 660,
          "conditions": "- VCE = 5 V, - IC = 2 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter voltage",
          "symbol": "VBE",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 750,
          "max": 820,
          "conditions": "- VCE = 5 V, - IC = 10 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Base capacitance",
          "symbol": "CCBO",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 3.5,
          "max": 6,
          "conditions": "- VCB = 10 V, IE = ie = 0, f = 1 MHz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Noise figure (BC556...BC558)",
          "symbol": "F",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 2,
          "max": 10,
          "conditions": "- VCE = 5 V, - IC = 200 µA, RG = 2 kΩ, f = 1 kHz, Δf = 200 Hz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Typical thermal resistance junction to ambient",
          "symbol": "RthA",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": 200,
          "max": null,
          "conditions": "leads kept at ambient temperature at 2 mm distance from case",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bc558a"
  ],
  "discovery_pitch": "BC558A (DIOTEC) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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    "bc558a.lbr",
    "docs/hero.png",
    "docs/bc558a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc558a-hero.glb",
    "bc558a-hero.overlay.json",
    "bc558a-etched.glb"
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  "visibility": {
    "public": true
  }
}