main
Ray Set visibility: public 3aa0b82 13d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "bc557btf",
  "title": "BC557BTF",
  "brief": "onsemi Bipolar Transistors - BJT, TO-92-3. 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",
    "bc557btf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "BC557BTF",
    "manufacturer": "onsemi",
    "package": "TO-92-3",
    "pin_count": 3,
    "category": "Transistors",
    "subcategory": "Bipolar Transistors - BJT",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/bc557btf-d.pdf",
    "parts": {
      "symbol": "bc557btf.kicad_sym",
      "footprint": "bc557btf.kicad_mod",
      "model_3d": "bc557btf-hero.glb",
      "model_3d_plain": "bc557btf-etched.glb",
      "model_3d_step": "bc557btf-etched.step",
      "model_3d_step_plain": "bc557btf.step",
      "lbr": "bc557btf.lbr"
    },
    "distributor_links": {
      "lcsc": "C900808"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T22:48:55Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 879 calls left today"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Collector",
        "type": "passive",
        "description": "Collector of the PNP transistor; VCEO is -45 V and DC collector current is -100 mA max for BC557 (peak -200 mA)."
      },
      {
        "number": "2",
        "name": "Base",
        "type": "passive",
        "description": "Base of the PNP transistor; peak base current is -200 mA max and emitter-base voltage is -5 V max."
      },
      {
        "number": "3",
        "name": "Emitter",
        "type": "passive",
        "description": "Emitter of the PNP transistor; VEBO is -5 V max relative to the base."
      }
    ],
    "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": [
          "extractor flagged: Datasheet lists BC557BTF as TO-92 3L, Tape and Reel; the pin list (1 Collector, 2 Base, 3 Emitter) i"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0857,
        "at": "2026-10-22T22:48:37"
      },
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/bc557btf-d.pdf",
        "pages": 10,
        "sha256": "9066be14fd580753",
        "source_tier": "mfr"
      },
      "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": "bc557btf.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": "bc557btf-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": "0b00438689d04ba8a080b86e1d75d8f120306c6bc703549776c437f49ccb4e56",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "TO-92-3",
      "Category": "Transistors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "9066be14fd580753be2457c320d02205c702c8cf4885e6465f20772d9e865f32",
      "rows": [
        {
          "name": "Collector-Base Voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -50,
          "conditions": "BC557 / BC560, TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter Voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -45,
          "conditions": "BC557 / BC560, TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Emitter-Base Voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -5,
          "conditions": "TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector Current (DC)",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak Collector Current (Pulse)",
          "symbol": "ICP",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -200,
          "conditions": "TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak Base Current (Pulse)",
          "symbol": "IBP",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -200,
          "conditions": "TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "TA = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "-65 to +150",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total Power Dissipation",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "TA = 25°C, FR-4 PCB 76 mm x 114 mm x 1.57 mm, minimum land pattern",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Derate Above 25°C",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW/°C",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "Above 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance, Junction-to-Ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 250,
          "conditions": "FR-4 PCB 76 mm x 114 mm x 1.57 mm, minimum land pattern",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector Cut-Off Current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": -15,
          "conditions": "VCB = -30 V, IE = 0",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Current Gain (B grade)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 200,
          "typ": null,
          "max": 450,
          "conditions": "VCE = -5 V, IC = -2 mA; classification B 200 ~ 450",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "DC Current Gain (family)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 110,
          "typ": null,
          "max": 800,
          "conditions": "VCE = -5 V, IC = -2 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter Saturation Voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -90,
          "max": -300,
          "conditions": "IC = -10 mA, IB = -0.5 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter Saturation Voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -250,
          "max": -650,
          "conditions": "IC = -100 mA, IB = -5 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter On Voltage",
          "symbol": "VBE(on)",
          "kind": "electrical",
          "unit": "mV",
          "min": -600,
          "typ": -660,
          "max": -750,
          "conditions": "VCE = -5 V, IC = -2 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Noise Figure",
          "symbol": "NF",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 2,
          "max": 10,
          "conditions": "BC556 / BC557 / BC558, VCE = -5 V, IC = -200 μA, f = 1 kHz, RG = 2 kΩ",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter Saturation Voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -700,
          "max": null,
          "conditions": "IC = -10 mA, IB = -0.5 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter Saturation Voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -900,
          "max": null,
          "conditions": "IC = -100 mA, IB = -5 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter On Voltage",
          "symbol": "VBE(on)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": -800,
          "max": null,
          "conditions": "VCE = -5 V, IC = -10 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current Gain Bandwidth Product",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "VCE = -5 V, IC = -10 mA, f = 10 MHz",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Capacitance",
          "symbol": "Cob",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 6,
          "max": null,
          "conditions": "VCB = -10 V, IE = 0, f = 1 MHz",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bc557btf"
  ],
  "discovery_pitch": "BC557BTF (onsemi) 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",
    "bc557btf.kicad_sym",
    "bc557btf.kicad_mod",
    "bc557btf.glb",
    "bc557btf.step",
    "bc557btf.lbr",
    "docs/hero.png",
    "docs/bc557btf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bc557btf-hero.glb",
    "bc557btf-hero.overlay.json",
    "bc557btf-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}