BC857

{
  "schema_version": 1,
  "type": "component",
  "slug": "bc857",
  "title": "BC857",
  "brief": "ST Semtech 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": [
    "component",
    "transistors-thyristors",
    "bc857",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "BC857",
    "manufacturer": "ST Semtech",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586187823665844224",
    "parts": {
      "symbol": "bc857.kicad_sym",
      "footprint": "bc857.kicad_mod",
      "model_3d": "bc857-hero.glb",
      "model_3d_plain": "bc857.glb",
      "model_3d_step": "bc857-etched.step",
      "model_3d_step_plain": "bc857.step",
      "lbr": "bc857.lbr"
    },
    "distributor_links": {
      "lcsc": "C148244",
      "mouser": "583-C857"
    },
    "distributor_check": {
      "checked_at": "2026-10-09T03:11:58Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "583-C857",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Base",
        "type": "input",
        "description": "Base of the PNP transistor; the datasheet gives -VEBO max 5 V and -V(BR)EBO min 5 V at -IE = 1 µA."
      },
      {
        "number": "2",
        "name": "Emitter",
        "type": "passive",
        "description": "Emitter of the PNP transistor; the datasheet gives collector current -IC max 100 mA and peak -ICM max 200 mA."
      },
      {
        "number": "3",
        "name": "Collector",
        "type": "passive",
        "description": "Collector of the PNP transistor; for BC857 the datasheet gives -VCBO 50 V, -VCEO 45 V, -IC 100 mA and Ptot 200 mW."
      }
    ],
    "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+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin assignment (1 Base, 2 Emitter, 3 Collector) is read from the package drawing on page 1. The data",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 3,
        "cost_usd": 0.1722,
        "at": "2026-10-09T03:10:28"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586187823665844224",
        "pages": 3,
        "sha256": "4ff3aaeb20421474",
        "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": "bc857.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bc857-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "2fd4a994978c144b7fe2109edeb4d1bddfb5fd23419f44b0f55ac9a27fb98b75",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ST Semtech",
      "Package": "SOT-23",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "4ff3aaeb20421474",
      "rows": [
        {
          "name": "DC current gain, Group A",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 125,
          "typ": null,
          "max": 250,
          "conditions": "at -VCE = 5 V, -IC = 2 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "DC current gain, Group B",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 220,
          "typ": null,
          "max": 475,
          "conditions": "at -VCE = 5 V, -IC = 2 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "DC current gain, Group C",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 420,
          "typ": null,
          "max": 800,
          "conditions": "at -VCE = 5 V, -IC = 2 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector base cutoff current",
          "symbol": "-ICBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 15,
          "conditions": "at -VCB = 30 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector base breakdown voltage, BC857/BC860",
          "symbol": "-V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": 50,
          "typ": null,
          "max": null,
          "conditions": "at -IC = 10 µA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector emitter breakdown voltage (CES), BC857/BC860",
          "symbol": "-V(BR)CES",
          "kind": "electrical",
          "unit": "V",
          "min": 50,
          "typ": null,
          "max": null,
          "conditions": "at -IC = 10 µA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector emitter breakdown voltage (CEO), BC857/BC860",
          "symbol": "-V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": 45,
          "typ": null,
          "max": null,
          "conditions": "at -IC = 10 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Emitter base breakdown voltage",
          "symbol": "-V(BR)EBO",
          "kind": "electrical",
          "unit": "V",
          "min": 5,
          "typ": null,
          "max": null,
          "conditions": "at -IE = 1 µA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector emitter saturation voltage",
          "symbol": "-VCE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "at -IC = 10 mA, -IB = 0.5 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector emitter saturation voltage",
          "symbol": "-VCE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.65,
          "conditions": "at -IC = 100 mA, -IB = 5 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Base emitter on voltage",
          "symbol": "-VBE(on)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.6,
          "typ": null,
          "max": 0.75,
          "conditions": "at -VCE = 5 V, -IC = 2 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Base emitter on voltage",
          "symbol": "-VBE(on)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.82,
          "conditions": "at -VCE = 5 V, -IC = 10 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Current gain bandwidth product",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "at -VCE = 5 V, -IC = 10 mA, f = 100 MHz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector output capacitance",
          "symbol": "Cob",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "at -VCB = 10 V, f = 1 MHz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector base voltage, BC857/BC860",
          "symbol": "-VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector emitter voltage, BC857/BC860",
          "symbol": "-VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 45,
          "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",
          "symbol": "-IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Peak collector current",
          "symbol": "-ICM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "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": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bc857"
  ],
  "discovery_pitch": "BC857 (ST Semtech) 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",
    "bc857.kicad_sym",
    "bc857.kicad_mod",
    "bc857.glb",
    "bc857.step",
    "bc857.lbr",
    "docs/hero.png",
    "docs/bc857-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc857-hero.glb",
    "bc857-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}