main
Ray Set visibility: public 6f27f8e 2h ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "bc857w-qx",
  "title": "BC857W-QX",
  "brief": "Nexperia Bipolar (BJT), SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "transistors-thyristors",
    "bc857w-qx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "BC857W-QX",
    "manufacturer": "Nexperia",
    "package": "SOT-323",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602563491878621184",
    "parts": {
      "symbol": "bc857w-qx.kicad_sym",
      "footprint": "bc857w-qx.kicad_mod",
      "model_3d": "bc857w-qx-hero.glb",
      "model_3d_plain": "bc857w-qx-etched.glb",
      "model_3d_step": "bc857w-qx-etched.step",
      "model_3d_step_plain": "bc857w-qx.step",
      "lbr": "bc857w-qx.lbr"
    },
    "distributor_links": {
      "lcsc": "C6131353"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T15:54:28Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "B",
        "type": "passive",
        "description": "Base terminal; the datasheet limits peak base current IBM to -200 mA for this device family (BC856W-Q/BC857W-Q/BC858W-Q)."
      },
      {
        "number": "2",
        "name": "E",
        "type": "passive",
        "description": "Emitter terminal; the emitter-base voltage VEBO is limited to -5 V with open collector."
      },
      {
        "number": "3",
        "name": "C",
        "type": "passive",
        "description": "Collector terminal; for BC857W-Q the collector-emitter voltage VCEO is -45 V (open base) and collector current IC is limited to -100 mA (peak ICM -200 mA)."
      }
    ],
    "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": [],
        "pages_sent": 13,
        "cost_usd": 0.0576,
        "at": "2026-10-17T15:52:22"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602563491878621184",
        "pages": 13,
        "sha256": "4832a02efea5b89a",
        "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": "bc857w-qx.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.1,
          2,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "acbf75a28fe41aa90efb38cd2b78220968d6eb6ebae1625dfd532dbeb268fece",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bc857w-qx-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.1,
          2,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "effd17a154e61f6b4577cdac681c95a017d49a2eb5b476cff47c03d96517239a",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "SOT-323",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "4832a02efea5b89a210887262f4283b0ef2f9f3058b62fd7ef312b009af5d451",
      "rows": [
        {
          "name": "Collector-base breakdown voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": -50,
          "typ": null,
          "max": null,
          "conditions": "IC = -100 µA; IE = 0 A",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": -45,
          "typ": null,
          "max": null,
          "conditions": "IC = -2 mA; IB = 0 A",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base breakdown voltage",
          "symbol": "V(BR)EBO",
          "kind": "electrical",
          "unit": "V",
          "min": -5,
          "typ": null,
          "max": null,
          "conditions": "IC = 0 A; IE = -100 µA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Collector-base cut-off current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": -1,
          "max": -15,
          "conditions": "VCB = -30 V; IE = 0 A",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Collector-base cut-off current at Tj = 150 °C",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": -4,
          "conditions": "VCB = -30 V; IE = 0 A; Tj = 150 °C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base cut-off current",
          "symbol": "IEBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "VEB = -5 V; IC = 0 A",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BC857W-Q)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 125,
          "typ": null,
          "max": 800,
          "conditions": "VCE = -5 V; IC = -2 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCEsat",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -75,
          "max": -300,
          "conditions": "IC = -10 mA; IB = -0.5 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCEsat",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -250,
          "max": -600,
          "conditions": "IC = -100 mA; IB = -5 mA; pulsed; tp ≤ 300 μs; δ ≤ 0.02",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter voltage",
          "symbol": "VBE",
          "kind": "electrical",
          "unit": "mV",
          "min": -600,
          "typ": -650,
          "max": -750,
          "conditions": "VCE = -5 V; IC = -2 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter voltage",
          "symbol": "VBE",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": -820,
          "conditions": "VCE = -5 V; IC = -10 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "VCE = -5 V; IC = -10 mA; f = 100 MHz",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Noise figure",
          "symbol": "NF",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 2,
          "max": 10,
          "conditions": "IC = -200 µA; VCE = -5 V; RS = 2 kΩ; f = 1 kHz; B = 200Hz",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Collector-base voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -50,
          "conditions": "open emitter",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -45,
          "conditions": "open base",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -5,
          "conditions": "open collector",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector current",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak collector current",
          "symbol": "ICM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -200,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak base current",
          "symbol": "IBM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -200,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "Tamb ≤ 25 °C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Ambient temperature",
          "symbol": "Tamb",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance from junction to ambient",
          "symbol": "Rth(j-a)",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 625,
          "conditions": "in free air; FR4 PCB, single-sided, 35 µm copper, tin-plated, standard footprint",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bc857w-qx"
  ],
  "discovery_pitch": "BC857W-QX (Nexperia) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bc857w-qx.kicad_sym",
    "bc857w-qx.kicad_mod",
    "bc857w-qx.glb",
    "bc857w-qx.step",
    "bc857w-qx.lbr",
    "docs/hero.png",
    "docs/bc857w-qx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc857w-qx-hero.glb",
    "bc857w-qx-hero.overlay.json",
    "bc857w-qx-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}