BCX55-QX

{
  "schema_version": 1,
  "type": "component",
  "slug": "bcx55-qx",
  "title": "BCX55-QX",
  "brief": "Nexperia Bipolar (BJT), SOT-89. 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",
    "bcx55-qx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "BCX55-QX",
    "manufacturer": "Nexperia",
    "package": "SOT-89",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8600687574826561536",
    "parts": {
      "symbol": "bcx55-qx.kicad_sym",
      "footprint": "bcx55-qx.kicad_mod",
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      "model_3d_plain": "bcx55-qx-etched.glb",
      "model_3d_step": "bcx55-qx-etched.step",
      "model_3d_step_plain": "bcx55-qx.step",
      "lbr": "bcx55-qx.lbr"
    },
    "distributor_links": {
      "lcsc": "C7219726",
      "mouser": "771-BCX55-QX"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T10:06:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "error"
      },
      "mouser": {
        "pn": "771-BCX55-QX",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the NPN transistor; the datasheet gives no pin-specific limit, and the device emitter-base breakdown is limited by VEBO of 5 V (open collector)."
      },
      {
        "number": "2",
        "name": "C",
        "type": "passive",
        "description": "Collector of the NPN transistor, rated for VCEO of 60 V (open base) and a collector current of 1 A DC, with 2 A peak for single pulses of tp ≤ 1 ms."
      },
      {
        "number": "3",
        "name": "B",
        "type": "passive",
        "description": "Base of the NPN transistor, rated for a base current of 0.3 A DC and a peak base current of 0.3 A for single pulses of tp ≤ 1 ms."
      }
    ],
    "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's pinning table (Table 3) lists only pins 1, 2 and 3 (E, C, B). The SOT-89 exposed die; The electrical pin types are not stated in the datasheet. I mapped E, C and B to KiCad 'passive', wh; The pinout applies to all three orderable variants in this family that are sold in SOT-89 (BCX55-Q, "
        ],
        "pages_sent": 12,
        "cost_usd": 0.054,
        "at": "2026-10-19T10:03:55"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8600687574826561536",
        "pages": 12,
        "sha256": "e22fa5bf52dd9752",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          4.5,
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        "zmin_mm": 0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "844c0bb504d0c383535d9845c6376fe7a4053241a2ede8d8ef694df3fcfc37c8",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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        "sha256": "2e2fb42fbea49be70e2c773707e7676367ae194408d49e2a1f5d8ce7cfde5a09",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "SOT-89",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "e22fa5bf52dd97521c28160ea1cfb6af9cb799cb895e2f68c6d7b3da57710e56",
      "rows": [
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          "name": "Collector-base voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 60,
          "conditions": "open emitter",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 60,
          "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": "A",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak collector current",
          "symbol": "ICM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "single pulse; tp ≤ 1 ms",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Base current",
          "symbol": "IB",
          "kind": "absolute_maximum",
          "unit": "A",
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          "typ": null,
          "max": 0.3,
          "conditions": "",
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        },
        {
          "name": "Peak base current",
          "symbol": "IBM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "single pulse; tp ≤ 1 ms",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "Tamb ≤ 25 °C; [1] FR4 PCB, single-sided copper, standard footprint",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.95,
          "conditions": "Tamb ≤ 25 °C; [2] FR4 PCB, single-sided copper, mounting pad for collector 1 cm2",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1.35,
          "conditions": "Tamb ≤ 25 °C; [3] FR4 PCB, single-sided copper, mounting pad for collector 6 cm2",
          "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": -55,
          "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": "Collector-base breakdown voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": 60,
          "typ": null,
          "max": null,
          "conditions": "IC = 100 µA; IE = 0; Tamb = 25 °C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": 60,
          "typ": null,
          "max": null,
          "conditions": "IC = 2 µA; IB = 0 A; Tamb = 25 °C",
          "source_page": 6,
          "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; Tamb = 25 °C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Collector-base cut-off current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VCB = 30 V; IE = 0 A; Tamb = 25 °C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Collector-base cut-off current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "VCB = 30 V; IE = 0 A; Tj = 150 °C",
          "source_page": 6,
          "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; Tamb = 25 °C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BCX55-Q)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 63,
          "typ": null,
          "max": null,
          "conditions": "VCE = 2 V; IC = 5 mA; Tamb = 25 °C; pulsed; tp ≤ 300 µs; δ ≤ 0.02",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BCX55-Q)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 63,
          "typ": null,
          "max": 250,
          "conditions": "VCE = 2 V; IC = 150 mA; Tamb = 25 °C; pulsed; tp ≤ 300 µs; δ ≤ 0.02",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "DC current gain (BCX55-Q)",
          "symbol": "hFE",
          "kind": "electrical",
          "unit": "",
          "min": 40,
          "typ": null,
          "max": null,
          "conditions": "VCE = 2 V; IC = 500 mA; Tamb = 25 °C; pulsed; tp ≤ 300 µs; δ ≤ 0.02",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCEsat",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "IC = 500 mA; IB = 50 mA; Tamb = 25 °C; pulsed; tp ≤ 300 µs; δ ≤ 0.02",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Base-emitter voltage",
          "symbol": "VBE",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "VCE = 2 V; IC = 500 mA; Tamb = 25 °C; pulsed; tp ≤ 300 µs; δ ≤ 0.02",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": 100,
          "typ": 180,
          "max": null,
          "conditions": "VCE = 5 V; IC = 50 mA; f = 100 MHz; Tamb = 25 °C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction to ambient",
          "symbol": "Rth(j-a)",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 250,
          "conditions": "in free air; [1] FR4 PCB, single-sided copper, standard footprint",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction to ambient",
          "symbol": "Rth(j-a)",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 132,
          "conditions": "in free air; [2] FR4 PCB, single-sided copper, mounting pad for collector 1 cm2",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction to ambient",
          "symbol": "Rth(j-a)",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 93,
          "conditions": "in free air; [3] FR4 PCB, single-sided copper, mounting pad for collector 6 cm2",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction to solder point",
          "symbol": "Rth(j-sp)",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 16,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_triggers": [
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  ],
  "discovery_pitch": "BCX55-QX (Nexperia) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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  "visibility": {
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}