BC559BTA

{
  "slug": "bc559bta",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Bipolar Transistors - BJT, TO-92-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "transistors",
    "bc559bta",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bc559bta.kicad_sym",
    "bc559bta.kicad_mod",
    "bc559bta.glb",
    "bc559bta.step",
    "bc559bta.lbr",
    "docs/hero.png",
    "docs/bc559bta-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc559bta-hero.glb",
    "bc559bta-hero.overlay.json",
    "bc559bta-etched.glb"
  ],
  "component": {
    "mpn": "BC559BTA",
    "manufacturer": "onsemi",
    "package": "TO-92-3",
    "pin_count": 3,
    "category": "Transistors",
    "subcategory": "Bipolar Transistors - BJT",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/bc559bta-d.pdf",
    "parts": {
      "symbol": "bc559bta.kicad_sym",
      "footprint": "bc559bta.kicad_mod",
      "model_3d": "bc559bta-hero.glb",
      "model_3d_plain": "bc559bta-etched.glb",
      "model_3d_step": "bc559bta-etched.step",
      "model_3d_step_plain": "bc559bta.step",
      "lbr": "bc559bta.lbr"
    },
    "distributor_links": {
      "lcsc": "C900809",
      "mouser": "512-BC559BTA"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T23:45:56Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 989 calls left today"
      },
      "mouser": {
        "pn": "512-BC559BTA",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Collector",
        "type": "passive",
        "description": "Collector terminal; for the BC559 the datasheet gives VCBO of -30 V, VCEO of -30 V and a DC collector current of -100 mA (peak pulse -200 mA)."
      },
      {
        "number": "2",
        "name": "Base",
        "type": "passive",
        "description": "Base terminal; the datasheet gives a peak base current (pulse) rating of -200 mA."
      },
      {
        "number": "3",
        "name": "Emitter",
        "type": "passive",
        "description": "Emitter terminal; the datasheet gives an emitter-base voltage rating of -5 V."
      }
    ],
    "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 pin assignment (1 Collector, 2 Base, 3 Emitter) is given once for the whole BC556/557/558/559/56; Pin types are not stated in the datasheet; passive was assigned to all three terminals because the d"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0436,
        "at": "2026-10-28T23:45:48"
      },
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/bc559bta-d.pdf",
        "pages": 10,
        "sha256": "325fc5c136bc1776",
        "source_tier": "mfr"
      },
      "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": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bc559bta-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "sha256": "c72bf3540a1fb4ae2022e70177e51e387e26ba1be3e342b276b91699302b3fc6",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  }
}