MMBT3904

{
  "schema_version": 1,
  "type": "component",
  "slug": "mmbt3904",
  "title": "MMBT3904",
  "brief": "Diodes Inc NPN small-signal transistor, SOT-23. 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",
    "sot-23",
    "diodes-incorporated"
  ],
  "component": {
    "mpn": "MMBT3904",
    "manufacturer": "Diodes Incorporated",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Transistor",
    "subcategory": "NPN bipolar transistor",
    "datasheet": "https://www.diodes.com/assets/Datasheets/MMBT3904.pdf",
    "parts": {
      "symbol": "mmbt3904.kicad_sym",
      "footprint": "mmbt3904.kicad_mod",
      "model_3d": "mmbt3904-etched.glb",
      "model_3d_plain": "mmbt3904.glb",
      "lbr": "mmbt3904.lbr",
      "model_3d_step": "mmbt3904-etched.step",
      "model_3d_step_plain": "mmbt3904.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "B",
        "type": "input",
        "description": "Base terminal of the NPN BJT. Controls collector current via base drive; VBE(sat) = 0.65-0.95V at IC = 10-50mA. Emitter-Base breakdown voltage BVEBO = 6.0V."
      },
      {
        "number": "2",
        "name": "E",
        "type": "passive",
        "description": "Emitter terminal of the NPN BJT. Typically tied to circuit common or emitter-degeneration network. Emitter-Base breakdown voltage BVEBO = 6.0V."
      },
      {
        "number": "3",
        "name": "C",
        "type": "passive",
        "description": "Collector terminal of the NPN BJT. Collector-Emitter breakdown BVCEO = 40V, Collector-Base breakdown BVCBO = 60V, max collector current IC = 200mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.diodes.com/assets/Datasheets/MMBT3904.pdf",
        "pages": 7,
        "sha256": "483284b10e2a58c8",
        "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": "mmbt3904.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mmbt3904-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "41775cfa3a92675f3f66007ed4a39f65403fb5ef197b38a73331142105862abb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "NPN small-signal BJT",
      "Collector-emitter voltage (VCEO)": "40 V",
      "Collector-base voltage (VCBO)": "60 V",
      "Emitter-base voltage (VEBO)": "6 V",
      "Collector current (IC)": "200 mA",
      "DC current gain (hFE)": "100-300 @ IC = 10 mA",
      "Transition frequency (fT)": "300 MHz",
      "Package": "SOT-23",
      "Body (L×W×H)": "2.9 × 1.3 × 1.1 mm"
    }
  },
  "discovery_triggers": [
    "mmbt3904",
    "2n3904",
    "npn transistor sot-23",
    "small signal transistor"
  ],
  "discovery_pitch": "MMBT3904 NPN small-signal transistor (SOT-23) with datasheet-verified specs, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "mmbt3904.kicad_sym",
    "mmbt3904.kicad_mod",
    "mmbt3904.glb",
    "mmbt3904.lbr",
    "docs/hero.png",
    "docs/mmbt3904-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mmbt3904-etched.step"
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "variants": [
    {
      "mpn": "MMBT3904-7-F",
      "kind": "packaging"
    },
    {
      "mpn": "MMBT3904-13-F",
      "kind": "packaging"
    }
  ]
}