BC637-TA

{
  "slug": "bc637-ta",
  "version": "0.1.0",
  "type": "component",
  "description": "Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "transistors-thyristors",
    "bc637-ta",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bc637-ta.kicad_sym",
    "bc637-ta.kicad_mod",
    "bc637-ta.glb",
    "bc637-ta.step",
    "bc637-ta.lbr",
    "docs/hero.png",
    "docs/bc637-ta-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc637-ta-hero.glb",
    "bc637-ta-hero.overlay.json",
    "bc637-ta-etched.glb"
  ],
  "component": {
    "mpn": "BC637-TA",
    "manufacturer": "Changjing",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590226985407983616",
    "parts": {
      "symbol": "bc637-ta.kicad_sym",
      "footprint": "bc637-ta.kicad_mod",
      "model_3d": "bc637-ta-hero.glb",
      "model_3d_plain": "bc637-ta-etched.glb",
      "model_3d_step": "bc637-ta-etched.step",
      "model_3d_step_plain": "bc637-ta.step",
      "lbr": "bc637-ta.lbr"
    },
    "distributor_links": {
      "lcsc": "C2910390"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T19:13:26Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the NPN transistor; the datasheet rates emitter-base voltage VEBO at 5 V."
      },
      {
        "number": "2",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal; for BC637 the collector-emitter voltage VCEO is 60 V and continuous collector current IC is 1 A, with collector power dissipation PC of 0.83 W."
      },
      {
        "number": "3",
        "name": "BASE",
        "type": "passive",
        "description": "Base terminal of the NPN transistor; the saturation test condition is IC=500 mA with IB=50 mA (VCE(sat) 0.5 V max)."
      }
    ],
    "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 pinout only as a text legend (1. EMITTER, 2. COLLECTOR, 3. BASE) with ; The datasheet covers the BC635/BC637/BC639 family with one shared TO-92 pinout. The ratings quoted i; Pin type 'passive' was chosen for all three transistor terminals, since KiCad has no native transist"
        ],
        "pages_sent": 5,
        "cost_usd": 0.0265,
        "at": "2026-10-18T19:11:07"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590226985407983616",
        "pages": 5,
        "sha256": "52e4f6f4f4a84afe",
        "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": "bc637-ta.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": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bc637-ta-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": "9753b00415598f4d54bde34f518d1f8e03212569d302684f320133de2c93641c",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}