MMFTN123K

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  "slug": "mmftn123k",
  "title": "MMFTN123K",
  "brief": "ST Semtech MOSFETs, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
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  "component": {
    "mpn": "MMFTN123K",
    "manufacturer": "ST Semtech",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "MOSFETs",
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      "lbr": "mmftn123k.lbr"
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    "distributor_links": {
      "lcsc": "C7464204"
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    "distributor_check": {
      "checked_at": "2026-10-17T21:38:09Z",
      "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": "Gate",
        "type": "input",
        "description": "Gate terminal of the N-channel enhancement MOSFET, rated for a gate-source voltage VGSS of ±20 V, with gate-source leakage specified at ±10 µA maximum at VGS = ±20 V."
      },
      {
        "number": "2",
        "name": "Source",
        "type": "passive",
        "description": "Source terminal of the N-channel enhancement MOSFET; the datasheet gives no pin-specific limit for this terminal, only device ratings such as VDSS of 100 V and drain current ID of 200 mA."
      },
      {
        "number": "3",
        "name": "Drain",
        "type": "passive",
        "description": "Drain terminal of the N-channel enhancement MOSFET, rated for a drain-source voltage VDSS of 100 V and a drain current ID of 200 mA (pulsed IDM of 600 mA)."
      }
    ],
    "provenance": {
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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        "at": "2026-10-17T21:34:54"
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      "pins": {
        "total": 3,
        "described": 3,
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "checked": "2026-10-17",
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  "metadata": {
    "specs": {
      "Manufacturer": "ST Semtech",
      "Package": "SOT-23",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
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          "name": "Drain-Source Voltage",
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          "unit": "V",
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          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Gate-Source Voltage",
          "symbol": "VGSS",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -20,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Drain Current",
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          "kind": "absolute_maximum",
          "unit": "mA",
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          "max": 200,
          "conditions": "",
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        },
        {
          "name": "Peak Drain Current, Pulsed",
          "symbol": "IDM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 600,
          "conditions": "Pulse Width ≤ 100 μs, Duty Cycle ≤ 2%",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Total Power Dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
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          "conditions": "",
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        {
          "name": "Storage Temperature Range",
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          "unit": "℃",
          "min": -55,
          "typ": null,
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          "conditions": "",
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        },
        {
          "name": "Thermal Resistance from Junction to Ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": null,
          "max": 250,
          "conditions": "Device mounted on FR-4 PC board, 2oz copper, 1-inch square copper plate, still air",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Drain-Source Breakdown Voltage",
          "symbol": "V(BR)DSS",
          "kind": "electrical",
          "unit": "V",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "at ID = 250 µA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Drain-Source Leakage Current",
          "symbol": "IDSS",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "at VDS = 80 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Gate-Source Leakage Current",
          "symbol": "IGSS",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "at VGS = ± 20 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Gate-Source Threshold Voltage",
          "symbol": "VGS(th)",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": 2.5,
          "conditions": "at VGS = VDS, ID = 1 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Drain-Source On-State Resistance",
          "symbol": "RDS(ON)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "at VGS = 10 V, ID = 190 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Drain-Source On-State Resistance",
          "symbol": "RDS(ON)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "at VGS = 4.5 V, ID = 150 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Drain-Source Diode Forward Voltage",
          "symbol": "VSD",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.2,
          "conditions": "at IS = 0.1 A, VGS = 0 V",
          "source_page": 2,
          "source": "datasheet"
        }
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    }
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  "discovery_pitch": "MMFTN123K (ST Semtech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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