TL431ILP

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  "slug": "tl431ilp",
  "title": "TL431ILP",
  "brief": "Texas Instruments Voltage Reference, TO-92-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "TL431ILP",
    "manufacturer": "Texas Instruments",
    "package": "TO-92-3",
    "pin_count": 3,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Reference",
    "datasheet": "https://www.ti.com/cn/lit/gpn/tl431",
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        "number": "1",
        "name": "CATHODE",
        "type": "passive",
        "description": "Shunt-regulator cathode terminal; when biased with a cathode current Imin≥1mA (recommended range 1mA to 100mA, absolute max −100mA to 150mA) it regulates the cathode-to-anode voltage VKA from Vref (~2.5V) up to 36V (absolute max 37V)."
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        "type": "passive",
        "description": "Common pin of the device (typically connected to ground/circuit common), serving as the return path for cathode current."
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      {
        "number": "3",
        "name": "REF",
        "type": "input",
        "description": "High-impedance reference/feedback input that sets the internal 2.495V threshold relative to ANODE; requires an input current (Iref) typically 2µA to 4µA (must be ≥ the minimum needed to bias the internal transistor, absolute maximum input current range −0.05mA to 10mA)."
      }
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        "at": "2026-09-23T17:11:50"
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      "pins": {
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        "described": 3,
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        "units": "mm",
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        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          4.83,
          3.745,
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        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
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        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-10-07",
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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TO-92-3",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "313277b9351e61ed",
      "rows": [
        {
          "name": "基准电压 (Reference voltage)",
          "symbol": "Vref",
          "kind": "electrical",
          "unit": "mV",
          "min": 2440,
          "typ": 2495,
          "max": 2550,
          "conditions": "VKA = Vref, IKA = 10mA",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "整个温度范围内的基准输入电压偏差 (Reference input voltage deviation over temperature), all other devices",
          "symbol": "VI(dev)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 5,
          "max": 50,
          "conditions": "VKA = Vref, IKA = 10mA",
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        {
          "name": "基准电压变化与阴极电压变化之比 (Ratio of reference voltage change to cathode voltage change), ΔVKA = 10V - Vref",
          "symbol": "ΔVref/ΔVKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1.4,
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          "conditions": "IKA = 10mA; ΔVKA = 10V - Vref",
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        {
          "name": "基准电压变化与阴极电压变化之比 (Ratio of reference voltage change to cathode voltage change), ΔVKA = 36V - 10V",
          "symbol": "ΔVref/ΔVKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1,
          "max": -2,
          "conditions": "IKA = 10mA; ΔVKA = 36V - 10V",
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        },
        {
          "name": "基准输入电流 (Reference input current)",
          "symbol": "Iref",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 2,
          "max": 4,
          "conditions": "IKA = 10mA, R1 = 10kΩ, R2 = ∞",
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        {
          "name": "整个温度范围内的基准输入电流偏差 (Reference input current deviation over temperature)",
          "symbol": "II(dev)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.8,
          "max": 2.5,
          "conditions": "IKA = 10mA, R1 = 10kΩ, R2 = ∞",
          "source_page": 8,
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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": 1,
          "conditions": "VKA = Vref",
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        },
        {
          "name": "关闭状态阴极电流 (Off-state cathode current)",
          "symbol": "Ioff",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.1,
          "max": 1,
          "conditions": "VKA = 36V, Vref = 0",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "动态阻抗 (Dynamic impedance)",
          "symbol": "|ZKA|",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 0.2,
          "max": 0.5,
          "conditions": "VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "阴极电压 (Cathode voltage)",
          "symbol": "VKA",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 37,
          "conditions": "referenced to ANODE",
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        },
        {
          "name": "连续阴极电流范围 (Continuous cathode current range)",
          "symbol": "IKA",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -100,
          "typ": null,
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          "conditions": "",
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        },
        {
          "name": "基准输入电流 (Reference input current)",
          "symbol": "II(ref)",
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          "unit": "mA",
          "min": -0.05,
          "typ": null,
          "max": 10,
          "conditions": "",
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        },
        {
          "name": "工作结温范围 (Operating junction temperature range)",
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        {
          "name": "贮存温度范围 (Storage temperature range)",
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          "unit": "°C",
          "min": -65,
          "typ": null,
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        {
          "name": "静电放电 人体放电模型 (ESD, Human Body Model)",
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          "min": -2000,
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        {
          "name": "静电放电 充电器件模型 (ESD, Charged Device Model)",
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          "unit": "°C",
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          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
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