BC857CLT3G

{
  "schema_version": 1,
  "type": "component",
  "slug": "bc857clt3g",
  "title": "BC857CLT3G",
  "brief": "onsemi Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "BC857CLT3G",
    "manufacturer": "onsemi",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588929174681620480",
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      "lbr": "bc857clt3g.lbr"
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    "distributor_links": {
      "lcsc": "C896681"
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      "checked_at": "2026-10-18T15:38:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
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      "mouser": {
        "pn": null,
        "status": "quota"
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    "pins": [
      {
        "number": "1",
        "name": "BASE",
        "type": "input",
        "description": "Base terminal of the PNP transistor; the series is rated for emitter-base voltage VEBO of -5.0 V and continuous collector current of -100 mA."
      },
      {
        "number": "2",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the PNP transistor; the BC857 series has emitter-base breakdown V(BR)EBO of -5.0 V minimum."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal of the PNP transistor; the BC857 series is rated for VCEO of -45 V and VCBO of -50 V, with -100 mA continuous and -200 mA peak collector current."
      }
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        "sha256": "daeab23fa6c6ac7c",
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-18",
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  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "SOT-23",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "daeab23fa6c6ac7c3ae69c4abe5b13f8d0c3c99294cfdb045f0c030797ca2c46",
      "rows": [
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          "name": "Collector-Emitter Breakdown Voltage (BC857 series)",
          "symbol": "V(BR)CEO",
          "kind": "electrical",
          "unit": "V",
          "min": -45,
          "typ": null,
          "max": null,
          "conditions": "IC = −10 mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector-Base Breakdown Voltage (BC857 series)",
          "symbol": "V(BR)CBO",
          "kind": "electrical",
          "unit": "V",
          "min": -50,
          "typ": null,
          "max": null,
          "conditions": "IC = −10 µA",
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        },
        {
          "name": "Emitter-Base Breakdown Voltage (BC857 series)",
          "symbol": "V(BR)EBO",
          "kind": "electrical",
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          "min": -5,
          "typ": null,
          "max": null,
          "conditions": "IE = −1.0 µA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector Cutoff Current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": -15,
          "conditions": "VCB = −30 V",
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        },
        {
          "name": "Collector Cutoff Current",
          "symbol": "ICBO",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": -4,
          "conditions": "VCB = −30 V, TA = 150°C",
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        },
        {
          "name": "Collector-Emitter Saturation Voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -0.3,
          "conditions": "IC = −10 mA, IB = −0.5 mA",
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          "name": "Collector-Emitter Saturation Voltage",
          "symbol": "VCE(sat)",
          "kind": "electrical",
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          "typ": null,
          "max": -0.65,
          "conditions": "IC = −100 mA, IB = −5.0 mA",
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          "name": "Base-Emitter On Voltage",
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          "kind": "electrical",
          "unit": "V",
          "min": -0.6,
          "typ": null,
          "max": null,
          "conditions": "IC = −2.0 mA, VCE = −5.0 V",
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        {
          "name": "Base-Emitter On Voltage",
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          "min": null,
          "typ": null,
          "max": -0.75,
          "conditions": "IC = −2.0 mA, VCE = −5.0 V",
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        {
          "name": "Base-Emitter On Voltage",
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          "unit": "V",
          "min": null,
          "typ": null,
          "max": -0.82,
          "conditions": "IC = −10 mA, VCE = −5.0 V",
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        },
        {
          "name": "Current-Gain-Bandwidth Product",
          "symbol": "fT",
          "kind": "electrical",
          "unit": "MHz",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "IC = −10 mA, VCE = −5.0 Vdc, f = 100 MHz",
          "source_page": 3,
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        },
        {
          "name": "Output Capacitance",
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          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": null,
          "max": 4.5,
          "conditions": "VCB = −10 V, f = 1.0 MHz",
          "source_page": 3,
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        },
        {
          "name": "Noise Figure (BC857 series)",
          "symbol": "NF",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "IC = −0.2 mA, VCE = −5.0 Vdc, RS = 2.0 k, f = 1.0 kHz, BW = 200 Hz",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Collector-Emitter Voltage (BC857)",
          "symbol": "VCEO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -45,
          "conditions": "TA = 25°C",
          "source_page": 2,
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        },
        {
          "name": "Collector-Base Voltage (BC857)",
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          "unit": "V",
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          "typ": null,
          "max": -50,
          "conditions": "TA = 25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Emitter-Base Voltage",
          "symbol": "VEBO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -5,
          "conditions": "TA = 25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Collector Current - Continuous",
          "symbol": "IC",
          "kind": "absolute_maximum",
          "unit": "mAdc",
          "min": null,
          "typ": null,
          "max": -100,
          "conditions": "",
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        {
          "name": "Collector Current - Peak",
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          "typ": null,
          "max": -200,
          "conditions": "",
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        {
          "name": "Junction and Storage Temperature",
          "symbol": "TJ, Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
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        },
        {
          "name": "Total Device Dissipation (FR-5 board)",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
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          "max": 225,
          "conditions": "FR-5 board, TA = 25°C",
          "source_page": 2,
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        },
        {
          "name": "Thermal Resistance, Junction-to-Case",
          "symbol": "RJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 83.3,
          "conditions": "Figure 13 note: ZJC(t) = r(t) RJC",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance, Junction-to-Ambient (transient note)",
          "symbol": "RJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "Figure 13 note: ZJA(t) = r(t) RJA",
          "source_page": 6,
          "source": "datasheet"
        }
      ]
    }
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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