2N3904

{
  "schema_version": 1,
  "type": "component",
  "slug": "2n3904",
  "title": "2N3904",
  "brief": "onsemi general-purpose NPN BJT, TO-92. 40 V, 200 mA, hFE 100-300, fT 300 MHz. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "transistor",
    "bjt",
    "npn",
    "to-92",
    "onsemi"
  ],
  "component": {
    "mpn": "2N3904",
    "manufacturer": "onsemi",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Transistor",
    "subcategory": "NPN BJT (general purpose)",
    "datasheet": "https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/2N3904.pdf",
    "parts": {
      "symbol": "2n3904.kicad_sym",
      "footprint": "2n3904.kicad_mod",
      "model_3d": "2n3904-etched.glb",
      "model_3d_plain": "2n3904.glb",
      "lbr": "2n3904.lbr",
      "model_3d_step": "2n3904-etched.step",
      "model_3d_step_plain": "2n3904.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the NPN transistor. VEBO breakdown 6.0 V. In TO-92 (viewed from the flat/front, leads down), lead 1 is Emitter."
      },
      {
        "number": "2",
        "name": "B",
        "type": "input",
        "description": "Base of the NPN transistor. Controls collector current with hFE typ 100-300 at IC=10 mA, VCE=1.0 V. VBE(sat) ≤ 0.85 V at IC=10 mA, IB=1.0 mA."
      },
      {
        "number": "3",
        "name": "C",
        "type": "passive",
        "description": "Collector of the NPN transistor. VCEO breakdown 40 V, VCBO breakdown 60 V, IC continuous max 200 mA. VCE(sat) ≤ 0.2 V at IC=10 mA, IB=1.0 mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/2N3904.pdf",
        "pages": 7,
        "sha256": "39b20929e3d2d854",
        "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": "2n3904.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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "2n3904-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": "b94ca4063cb4f1fda4ccd9ed5a8f5a0c4453b4b11c525192f6e9cad7d7e6e9cb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "NPN bipolar transistor",
      "Collector-emitter (VCEO)": "40 V",
      "Collector current (IC)": "200 mA",
      "DC gain (hFE)": "100-300",
      "Transition freq (fT)": "300 MHz",
      "Power dissipation": "625 mW",
      "Pinout": "E-B-C (pin 1 = emitter)",
      "Package": "TO-92"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "2n3904",
    "npn transistor",
    "general purpose bjt",
    "small signal npn"
  ],
  "discovery_pitch": "2N3904 general-purpose NPN bipolar transistor (TO-92) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "2n3904.kicad_sym",
    "2n3904.kicad_mod",
    "2n3904.glb",
    "2n3904.lbr",
    "docs/hero.png",
    "docs/2n3904-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "2n3904-etched.step"
  ]
}