BC237

{
  "slug": "bc237",
  "version": "0.1.0",
  "type": "component",
  "description": "Changjing Bipolar Transistors - BJT, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "triode-mos tube-transistor",
    "bc237",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bc237.kicad_sym",
    "bc237.kicad_mod",
    "bc237.glb",
    "bc237.step",
    "bc237.lbr",
    "docs/hero.png",
    "docs/bc237-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc237-hero.glb",
    "bc237-hero.overlay.json",
    "bc237-etched.glb"
  ],
  "component": {
    "mpn": "BC237",
    "manufacturer": "Changjing",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Triode/MOS Tube/Transistor",
    "subcategory": "Bipolar Transistors - BJT",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/79fceec9da7936430b85b905f8ae217b.pdf",
    "parts": {
      "symbol": "bc237.kicad_sym",
      "footprint": "bc237.kicad_mod",
      "model_3d": "bc237-hero.glb",
      "model_3d_plain": "bc237-etched.glb",
      "model_3d_step": "bc237-etched.step",
      "model_3d_step_plain": "bc237.step",
      "lbr": "bc237.lbr"
    },
    "distributor_links": {
      "lcsc": "C3034831"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T21:18:14Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector; VCEO max 45 V (BC237) or 25 V (BC238/239), continuous collector current 0.1 A."
      },
      {
        "number": "2",
        "name": "BASE",
        "type": "input",
        "description": "Base; emitter-base voltage max 6 V (BC237) or 5 V (BC238/239)."
      },
      {
        "number": "3",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter; the datasheet gives collector power dissipation of 350 mW and junction temperature range of -55 to 150 °C for the device."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 4,
        "cost_usd": 0.0303,
        "at": "2026-10-22T21:18:00"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/79fceec9da7936430b85b905f8ae217b.pdf",
        "pages": 4,
        "sha256": "ebe180cb2865e62f",
        "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"
    },
    "models_3d": [
      {
        "file": "bc237.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          4.83,
          3.745,
          9.8
        ],
        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bc237-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          4.83,
          3.745,
          9.8
        ],
        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f9f562af4e3e293ec0856e8f057d52370b914135caf379fe55d3fa091051b691",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}