2N3055 NPN Power Transistor

{
  "schema_version": 1,
  "type": "component",
  "slug": "2n3055",
  "title": "2N3055 NPN Power Transistor",
  "brief": "Classic NPN power transistor, 60 V / 15 A, in a metal TO-3 package.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "transistor",
    "bjt",
    "npn",
    "power",
    "to-3",
    "st"
  ],
  "component": {
    "mpn": "2N3055",
    "manufacturer": "STMicroelectronics",
    "package": "TO-3",
    "pin_count": 3,
    "category": "Discrete Semiconductor",
    "subcategory": "Bipolar Transistor (BJT)",
    "datasheet": "https://www.st.com/resource/en/datasheet/2n3055.pdf",
    "parts": {
      "symbol": "2n3055.kicad_sym",
      "footprint": "2n3055.kicad_mod",
      "model_3d": "2n3055-etched.glb",
      "model_3d_plain": "2n3055.glb",
      "model_3d_step": "2n3055-etched.step",
      "model_3d_step_plain": "2n3055.step",
      "lbr": "2n3055.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "B",
        "type": "input",
        "description": "Base of NPN power transistor. Drives collector current via hFE (typ. 20-70 at IC = 4 A, VCE = 4 V). VBE ≈ 1.8 V at IC = 4 A. Absolute max IB = 7 A, VEBO = 7 V."
      },
      {
        "number": "2",
        "name": "E",
        "type": "passive",
        "description": "Emitter of NPN power transistor. Common return for base-drive and collector current. For NPN 2N3055 normally tied to circuit ground / lower-voltage rail."
      },
      {
        "number": "3",
        "name": "C",
        "type": "passive",
        "description": "Collector of NPN power transistor, electrically connected to the TO-3 metal case/mounting tab for heat-sinking. Rated VCBO = 100 V, VCEO = 60 V, IC = 15 A. Must be isolated from grounded heatsinks with a mica/insulator pad."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/2n3055.pdf",
        "pages": 7,
        "sha256": "c957a8b217de71e5",
        "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": "2n3055.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          40.2,
          27.2,
          19.0
        ],
        "zmin_mm": -10.0,
        "centre_offset_mm": 0.01,
        "footprint_binding": "identity",
        "sha256": "10d36da80a7f328482e27916f3044cc4bfec83922e402c41ed3552aa777116bb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "2n3055-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": [
          40.2,
          27.2,
          19.0
        ],
        "zmin_mm": -10.0,
        "centre_offset_mm": 0.01,
        "footprint_binding": "identity",
        "sha256": "89f757e19c5ecaa2b353afb4cd15c95051a87dc1283b4d34a2b98dccf46761eb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "NPN power transistor",
      "Collector-emitter voltage (VCEO)": "60 V",
      "Collector current (IC)": "15 A continuous",
      "DC current gain (hFE)": "20 to 70 at 4 A",
      "Transition frequency (fT)": "2.5 MHz",
      "Power dissipation": "115 W",
      "Package": "TO-3 (case = collector)",
      "Operating temperature": "-65 C to 200 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "NPN power transistor",
    "linear supply pass transistor",
    "audio power output",
    "15A transistor"
  ],
  "discovery_pitch": "The classic high-power NPN: 60 V, 15 A in a rugged metal TO-3 for linear supplies and audio output stages.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "2n3055.lbr",
    "docs/hero.png",
    "docs/2n3055-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "2n3055-etched.step"
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}