TL431BQPK

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  "title": "TL431BQPK",
  "brief": "Texas Instruments Voltage Reference, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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    "subcategory": "Voltage Reference",
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        "number": "1",
        "name": "REF",
        "type": "input",
        "description": "Reference input pin; establishes the threshold voltage for the internal 2.5V reference and receives feedback for voltage programming."
      },
      {
        "number": "2",
        "name": "ANODE",
        "type": "power_in",
        "description": "Anode or common pin; typically connected to ground or return path; internally attached to substrate."
      },
      {
        "number": "3",
        "name": "CATHODE",
        "type": "bidirectional",
        "description": "Cathode output pin; serves as the shunt regulator output terminal and sinks cathode current from 1 mA to 100 mA."
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        "at": "2026-09-22T19:01:10"
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        "pages": 86,
        "sha256": "313277b9351e61ed",
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        "total": 3,
        "described": 3,
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        "zmin_mm": 0.0,
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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOT-89-3",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
    },
    "characteristics": {
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          "name": "基准电压 (Reference voltage), TL431BQ",
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        },
        {
          "name": "调节的最小阴极电流 (Minimum cathode current for regulation)",
          "symbol": "Imin",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.4,
          "max": 0.7,
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        },
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          "name": "关闭状态阴极电流 (Off-state cathode current)",
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          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "conditions": "VKA = 36V，Vref = 0",
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        },
        {
          "name": "动态阻抗 (Dynamic impedance)",
          "symbol": "|ZKA|",
          "kind": "electrical",
          "unit": "Ω",
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          "typ": 0.2,
          "max": 0.5,
          "conditions": "VKA = Vref，f ≤ 1kHz，IKA = 1mA 至 100mA",
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          "name": "阴极电压 (Cathode voltage)",
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          "kind": "recommended_operating",
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        {
          "name": "自然通风条件下的工作温度范围 (Operating free-air temperature range)",
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          "unit": "°C",
          "min": -40,
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          "conditions": "TL43xxQ",
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        {
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          "name": "工作结温范围 (Operating virtual junction temperature range)",
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          "name": "贮存温度范围 (Storage temperature range)",
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          "name": "结至环境热阻 (Junction-to-ambient thermal resistance)",
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          "unit": "°C/W",
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          "name": "结至外壳（顶部）热阻 (Junction-to-case (top) thermal resistance)",
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          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 9,
          "max": null,
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  "updated_at": "2026-09-25T09:57:09.997Z"
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