main
Ray Set visibility: public 6ead83d 17d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "s8550d331",
  "title": "S8550D331",
  "brief": "ALJ Bipolar (BJT), TO-92. 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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    "transistors-thyristors",
    "s8550d331",
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    "extractor-text"
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  "component": {
    "mpn": "S8550D331",
    "manufacturer": "ALJ",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603352155009003520",
    "parts": {
      "symbol": "s8550d331.kicad_sym",
      "footprint": "s8550d331.kicad_mod",
      "model_3d": "s8550d331-hero.glb",
      "model_3d_plain": "s8550d331-etched.glb",
      "model_3d_step": "s8550d331-etched.step",
      "model_3d_step_plain": "s8550d331.step",
      "lbr": "s8550d331.lbr"
    },
    "distributor_links": {
      "lcsc": "C22751470"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T01:54:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Emitter",
        "type": "passive",
        "description": "Emitter terminal of the PNP transistor; the datasheet's absolute maximum emitter-base voltage VEBO is -5 V and emitter-base breakdown V(BR)EBO is -5 V at IE=-100µA."
      },
      {
        "number": "2",
        "name": "Base",
        "type": "passive",
        "description": "Base terminal; the datasheet's saturation test uses IB=-50mA with IC=-500mA, giving VBE(sat) of -1.2 V max, and emitter-base cut-off current IEBO is -100 nA max at VEB=-3V."
      },
      {
        "number": "3",
        "name": "Collector",
        "type": "passive",
        "description": "Collector terminal; the datasheet limits are VCBO -40 V, VCEO -25 V, IC -800 mA and PC 625 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 pin list only as a numbered legend (1. Emitter, 2. Base, 3. Collector) with ; The MPN suffix 'D331' (packing/variant code) is not explained anywhere in the text. The package is c; The pin types are assigned as 'passive' because the datasheet does not classify BJT terminals; they "
        ],
        "pages_sent": 2,
        "cost_usd": 0.0104,
        "at": "2026-10-18T01:52:56"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603352155009003520",
        "pages": 2,
        "sha256": "81c15b1760cef7cf",
        "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": "s8550d331.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": "s8550d331-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": [
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        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "459514e9799a371822ec950f4601bdcd075142d67e9028e2a6cfba2c552a7211",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ALJ",
      "Package": "TO-92",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "81c15b1760cef7cf272c7bdc97e42a4f1b63cd29eed0fb8170bc2744fbbb089d",
      "rows": [
        {
          "name": "Collector-base voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -40,
          "conditions": "Ta=25°C unless otherwise noted",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -25,
          "conditions": "Ta=25°C unless otherwise noted",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -5,
          "conditions": "Ta=25°C unless otherwise noted",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector current",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -800,
          "conditions": "Ta=25°C unless otherwise noted",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector power dissipation",
          "symbol": "PC",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 625,
          "conditions": "Ta=25°C unless otherwise noted",
          "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",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (hFE(1))",
          "symbol": "hFE(1)",
          "kind": "electrical",
          "unit": "",
          "min": 100,
          "typ": null,
          "max": 200,
          "conditions": "VCE=-1V, IC=-50mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (hFE(2))",
          "symbol": "hFE(2)",
          "kind": "electrical",
          "unit": "",
          "min": 50,
          "typ": null,
          "max": null,
          "conditions": "VCE=-1V, IC=-500mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-base breakdown voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": -40,
          "typ": null,
          "max": null,
          "conditions": "IC=-100µA,IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": -25,
          "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=-100µA,IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector cut-off current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "VCB=-40V,IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter cut-off current",
          "symbol": "IEBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "VEB=-3V,IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -0.6,
          "conditions": "IC=-500mA,IB=-50mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter saturation voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -1.2,
          "conditions": "IC=-500mA,IB=-50mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": 150,
          "typ": null,
          "max": null,
          "conditions": "VCE=-6V,IC=-20mA,f=30MHz",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "s8550d331"
  ],
  "discovery_pitch": "S8550D331 (ALJ) 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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    "s8550d331.step",
    "s8550d331.lbr",
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    "viewers/symbol.html",
    "viewers/footprint.html",
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    "s8550d331-etched.glb"
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  "visibility": {
    "public": true
  }
}