LMBT5551

{
  "schema_version": 1,
  "type": "component",
  "slug": "lmbt5551",
  "title": "LMBT5551",
  "brief": "LangJie Bipolar Transistors - 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",
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    "triode-mos tube-transistor",
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  "component": {
    "mpn": "LMBT5551",
    "manufacturer": "LangJie",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Triode/MOS Tube/Transistor",
    "subcategory": "Bipolar Transistors - BJT",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a3228c2bb1e3026b4a918d5abca8a3fd.pdf",
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      "lbr": "lmbt5551.lbr"
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    "distributor_links": {
      "lcsc": "C18195377"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T23:44:54Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 940 calls left today"
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      "mouser": {
        "pn": null,
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    "pins": [
      {
        "number": "1",
        "name": "BASE",
        "type": "input",
        "description": "Base terminal controls the transistor; the datasheet's emitter-base voltage rating is VEBO 6.0 Vdc."
      },
      {
        "number": "2",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal; the datasheet's emitter-base voltage rating is VEBO 6.0 Vdc and continuous collector current is limited to 600 mAdc."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal; for the LMBT5551 the datasheet gives VCEO 160 Vdc, VCBO 180 Vdc and continuous collector current 600 mAdc."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
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        "consensus": "skipped (clean text read)",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
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        "cost_usd": 0.0005,
        "at": "2026-10-27T23:44:39"
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      "datasheet": {
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        "pages": 5,
        "sha256": "b9a5a35fe0c79ad8",
        "source_tier": "lcsc"
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      "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"
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        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3,
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "LangJie",
      "Package": "SOT-23",
      "Category": "Triode/MOS Tube/Transistor",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "b9a5a35fe0c79ad8d87ff4cccbbc7999418d3bac8feedf87873fc60aa3221e67",
      "rows": [
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          "name": "Collector-Emitter Breakdown Voltage",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "Vdc",
          "min": 160,
          "typ": null,
          "max": null,
          "conditions": "IC = 1.0 mAdc, IB = 0",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Base Breakdown Voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "Vdc",
          "min": 180,
          "typ": null,
          "max": null,
          "conditions": "IC = 100 Adc, IE = 0",
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        },
        {
          "name": "Emitter-Base Breakdown Voltage",
          "symbol": "V(BR)EBO",
          "kind": "electrical",
          "unit": "Vdc",
          "min": 6,
          "typ": null,
          "max": null,
          "conditions": "IE = 10 Adc, IC = 0",
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        },
        {
          "name": "Collector Cutoff Current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "Adc",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VCB = 120 Vdc, IE = 0",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Emitter Cutoff Current",
          "symbol": "IEBO",
          "kind": "electrical",
          "unit": "nAdc",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VEB = 4.0 Vdc, IC = 0",
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        {
          "name": "DC Current Gain",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 80,
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        },
        {
          "name": "DC Current Gain",
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          "conditions": "IC = 10 mAdc, VCE = 5.0 Vdc",
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        {
          "name": "DC Current Gain",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 30,
          "typ": null,
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          "conditions": "IC = 50 mAdc, VCE = 5.0 Vdc",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter Saturation Voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "Vdc",
          "min": null,
          "typ": null,
          "max": 0.15,
          "conditions": "IC = 10 mAdc, IB = 1.0 mAdc",
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        },
        {
          "name": "Collector-Emitter Saturation Voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "Vdc",
          "min": null,
          "typ": null,
          "max": 0.2,
          "conditions": "IC = 50 mAdc, IB = 5.0 mAdc",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Base-Emitter Saturation Voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "Vdc",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "IC = 10 mAdc, IB = 1.0 mAdc",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector Emitter Cut-off Current",
          "symbol": "ICES",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VCB = 10 V",
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        },
        {
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          "symbol": "ICES",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VCB = 75 V",
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          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter Voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "Vdc",
          "min": null,
          "typ": null,
          "max": 160,
          "conditions": "",
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        },
        {
          "name": "Collector-Base Voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "Vdc",
          "min": null,
          "typ": null,
          "max": 180,
          "conditions": "",
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        {
          "name": "Emitter-Base Voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "Vdc",
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          "typ": null,
          "max": 6,
          "conditions": "",
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        },
        {
          "name": "Collector Current - Continuous",
          "symbol": "IC",
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          "unit": "mAdc",
          "min": null,
          "typ": null,
          "max": 600,
          "conditions": "",
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        },
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          "name": "Junction and Storage Temperature",
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          "min": -55,
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      ]
    }
  },
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    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "LMBT5551 (LangJie) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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