2N3904-TA

{
  "schema_version": 1,
  "type": "component",
  "slug": "2n3904-ta",
  "title": "2N3904-TA",
  "brief": "Changjing Bipolar (BJT), TO-92-2.54mm. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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  "component": {
    "mpn": "2N3904-TA",
    "manufacturer": "Changjing",
    "package": "TO-92-2.54mm",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588895760247640064",
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      "lbr": "2n3904-ta.lbr"
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    "distributor_links": {
      "lcsc": "C2081",
      "digikey": "2N3904TAFSCT-ND",
      "mouser": "512-2N3904TA"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T08:39:23Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2N3904TAFSCT-ND",
        "status": "found",
        "lifecycle": "Active"
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        "pn": "512-2N3904TA",
        "status": "found"
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    },
    "pins": [
      {
        "number": "1",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the NPN transistor; the datasheet gives an emitter-base breakdown voltage V(BR)EBO of 6 V (IE=10µA, IC=0) and a maximum emitter-base voltage VEBO of 6 V."
      },
      {
        "number": "2",
        "name": "B",
        "type": "passive",
        "description": "Base of the NPN transistor; the datasheet gives a base-emitter saturation voltage VBE(sat) of 0.95 V maximum at IC=50mA, IB=5mA."
      },
      {
        "number": "3",
        "name": "C",
        "type": "passive",
        "description": "Collector of the NPN transistor; the maximum ratings are VCBO 60 V, VCEO 40 V, continuous collector current IC 0.2 A and collector power dissipation PC 0.625 W."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "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: Pinout is taken from the TO-92 outline listing on page 1 (1. EMITTER, 2. BASE, 3. COLLECTOR). The da; Pin types are typed as passive because the datasheet describes transistor terminals rather than ERC-"
        ],
        "pages_sent": 2,
        "cost_usd": 0.0244,
        "at": "2026-10-17T08:39:03"
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      "datasheet": {
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        "pages": 2,
        "sha256": "bacae657187d6e0f",
        "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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    "models_3d": [
      {
        "file": "2n3904-ta.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
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        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Changjing",
      "Package": "TO-92-2.54mm",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "bacae657187d6e0f3e36da90df40302668076bf9d06701d295f0578164c4609d",
      "rows": [
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          "name": "Collector-base voltage",
          "symbol": "VCBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 60,
          "conditions": "Ta=25℃ (maximum ratings table header)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter voltage",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "Ta=25℃ (maximum ratings table header)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "Ta=25℃ (maximum ratings table header)",
          "source_page": 1,
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        },
        {
          "name": "Collector current -Continuous",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 0.2,
          "conditions": "Ta=25℃ (maximum ratings table header)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector power dissipation",
          "symbol": "PC",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.625,
          "conditions": "Ta=25℃ (maximum ratings table header)",
          "source_page": 1,
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        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "Ta=25℃ (maximum ratings table header)",
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        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "Ta=25℃ (maximum ratings table header)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-base breakdown voltage",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": 60,
          "typ": null,
          "max": null,
          "conditions": "Ta=25℃; IC=10μA, IE=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter breakdown voltage",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": 40,
          "typ": null,
          "max": null,
          "conditions": "Ta=25℃; IC= 1mA, IB=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Emitter-base breakdown voltage",
          "symbol": "V(BR)EBO",
          "kind": "electrical",
          "unit": "V",
          "min": 6,
          "typ": null,
          "max": null,
          "conditions": "Ta=25℃; IE= 10μA, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector cut-off current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "Ta=25℃; VCB=60V, IE=0",
          "source_page": 1,
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        },
        {
          "name": "Emitter cut-off current",
          "symbol": "IEBO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "Ta=25℃; VEB= 5V, IC=0",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC current gain",
          "symbol": "hFE1",
          "kind": "electrical",
          "unit": "",
          "min": 100,
          "typ": null,
          "max": 400,
          "conditions": "Ta=25℃; VCE=1V, IC=10mA",
          "source_page": 1,
          "source": "datasheet"
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        {
          "name": "DC current gain",
          "symbol": "hFE2",
          "kind": "electrical",
          "unit": "",
          "min": 60,
          "typ": null,
          "max": null,
          "conditions": "Ta=25℃; VCE=1V, IC=50mA",
          "source_page": 1,
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        {
          "name": "DC current gain",
          "symbol": "hFE3",
          "kind": "electrical",
          "unit": "",
          "min": 30,
          "typ": null,
          "max": null,
          "conditions": "Ta=25℃; VCE=1V, IC=100mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Collector-emitter saturation voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "V",
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          "typ": null,
          "max": 0.3,
          "conditions": "Ta=25℃; IC=50mA, IB=5mA",
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        {
          "name": "Base-emitter saturation voltage",
          "symbol": "VBE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.95,
          "conditions": "Ta=25℃; IC=50mA, IB=5mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Transition frequency",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHZ",
          "min": 300,
          "typ": null,
          "max": null,
          "conditions": "Ta=25℃; VCE=20V, IC=10mA, f=100MHz",
          "source_page": 1,
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        },
        {
          "name": "Delay time",
          "symbol": "td",
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        {
          "name": "Rise time",
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          "kind": "timing",
          "unit": "ns",
          "min": null,
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          "max": 35,
          "conditions": "VCC=3V, VBE=0.5V, IC=10mA, IB1=1mA",
          "source_page": 1,
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        {
          "name": "Storage time",
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          "kind": "timing",
          "unit": "ns",
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          "conditions": "",
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        {
          "name": "Fall time",
          "symbol": "tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VCC=3V, IC=10mA, IB1=IB2=1mA",
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    }
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  "discovery_pitch": "2N3904-TA (Changjing) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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