main
Ray Set visibility: public cefb430 17d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "c945",
  "title": "C945",
  "brief": "Changjing Bipolar (BJT), SOT-23. 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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  "component": {
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    "manufacturer": "Changjing",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172879486115840",
    "parts": {
      "symbol": "c945.kicad_sym",
      "footprint": "c945.kicad_mod",
      "model_3d": "c945-hero.glb",
      "model_3d_plain": "c945-etched.glb",
      "model_3d_step": "c945-etched.step",
      "model_3d_step_plain": "c945.step",
      "lbr": "c945.lbr"
    },
    "distributor_links": {
      "lcsc": "C8535"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T03:39:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BASE",
        "type": "input",
        "description": "Base terminal of the NPN transistor; the datasheet specifies VBE(sat) of 1 V at IC=100 mA with IB=10 mA and an emitter-base breakdown of 5 V minimum (VEBO 5 V maximum rating)."
      },
      {
        "number": "2",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the NPN transistor; the emitter-base voltage rating VEBO is 5 V and the absolute maximum IC is 150 mA continuous."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal of the NPN transistor; ratings are VCBO 60 V, VCEO 50 V, continuous IC 150 mA, and collector power dissipation PC 200 mW."
      }
    ],
    "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 gives the SOT-23 pin names (1 BASE, 2 EMITTER, 3 COLLECTOR) but does not assign KiCad "
        ],
        "pages_sent": 2,
        "cost_usd": 0.0144,
        "at": "2026-10-17T03:37:52"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172879486115840",
        "pages": 2,
        "sha256": "8d46f71c7d0d0124",
        "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": "c945.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          3,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "c945-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "39257e9bcbc5c87825bb90228d07e1e00ba34b06af565757534c0153bd45b569",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Changjing",
      "Package": "SOT-23",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "8d46f71c7d0d0124280f0604eb56f7178777a5224dfad44d06bdc2d6c5ae6b02",
      "rows": [
        {
          "name": "Collector-base breakdown voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": 60,
          "typ": null,
          "max": null,
          "conditions": "IC=100uA, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": 50,
          "typ": null,
          "max": null,
          "conditions": "IC=1mA, IB=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base breakdown voltage",
          "symbol": "V(BR)EBO",
          "kind": "electrical",
          "unit": "V",
          "min": 5,
          "typ": null,
          "max": null,
          "conditions": "IE=0.1mA, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector cut-off current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VCB=60V, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter cut-off current",
          "symbol": "IEBO",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VEB=5V, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain",
          "symbol": "hFE(1)",
          "kind": "electrical",
          "unit": "",
          "min": 130,
          "typ": null,
          "max": 400,
          "conditions": "VCE=6V, IC=1mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain",
          "symbol": "hFE(2)",
          "kind": "electrical",
          "unit": "",
          "min": 40,
          "typ": null,
          "max": null,
          "conditions": "VCE=6V, IC=0.1mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "IC=100mA, IB=10mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter saturation voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "IC=100mA, IB=10mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": 150,
          "typ": null,
          "max": null,
          "conditions": "VCE=6V, IC=10mA, f=30 MHz",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector output capacitance",
          "symbol": "Cob",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "VCB=10V, IE=0, f=1MHZ",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Noise figure",
          "symbol": "NF",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 4,
          "max": 10,
          "conditions": "VCE=6V, IC=0.1mA, Rg=10kΩ, f=1kMHZ",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-base voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 60,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector current, continuous",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector power dissipation",
          "symbol": "PC",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "c945"
  ],
  "discovery_pitch": "C945 (Changjing) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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    "c945.lbr",
    "docs/hero.png",
    "docs/c945-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "c945-hero.glb",
    "c945-hero.overlay.json",
    "c945-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}