TL431BCLP

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  "title": "TL431BCLP",
  "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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    "mpn": "TL431BCLP",
    "manufacturer": "Texas Instruments",
    "package": "TO-92-3",
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    "subcategory": "Voltage Reference",
    "datasheet": "https://www.ti.com/cn/lit/gpn/tl431",
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    "distributor_links": {
      "lcsc": "C1575567",
      "digikey": "296-31389-ND",
      "mouser": "595-TL431BCLP"
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    "distributor_check": {
      "checked_at": "2026-10-11T03:55:04Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
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        "pn": "595-TL431BCLP",
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    },
    "pins": [
      {
        "number": "1",
        "name": "CATHODE",
        "type": "bidirectional",
        "description": "Shunt current/voltage input; operates from Vref to 36 V with 1 mA to 100 mA continuous cathode current."
      },
      {
        "number": "2",
        "name": "ANODE",
        "type": "power_in",
        "description": "Common pin, normally connected to ground."
      },
      {
        "number": "3",
        "name": "REF",
        "type": "input",
        "description": "Threshold relative to the common anode (Vref about 2.495 V); must not float because it needs Iref of about 2 to 4 µA."
      }
    ],
    "provenance": {
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin numbers for the LP package come from the pin-function table (CATHODE 1, REF 3, ANODE 2) and matc",
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        "pages_sent": 86,
        "cost_usd": 0.8146,
        "at": "2026-10-11T03:54:51"
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      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/tl431",
        "pages": 86,
        "sha256": "313277b9351e61ed",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
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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,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
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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",
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          "name": "Reference voltage (TL431BC, VKA = Vref, IKA = 10 mA)",
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          "kind": "electrical",
          "unit": "mV",
          "min": 2483,
          "typ": 2495,
          "max": 2507,
          "conditions": "VKA = Vref, IKA = 10mA",
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        },
        {
          "name": "Reference voltage deviation over full temperature range",
          "symbol": "VI(dev)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 6,
          "max": 16,
          "conditions": "VKA = Vref, IKA = 10mA",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "Reference voltage change to cathode voltage change ratio (10 V to Vref)",
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          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1.4,
          "max": -2.7,
          "conditions": "IKA = 10mA, ΔVKA = 10V - Vref",
          "source_page": 13,
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        },
        {
          "name": "Reference voltage change to cathode voltage change ratio (36 V to 10 V)",
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          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1,
          "max": -2,
          "conditions": "IKA = 10mA, ΔVKA = 36V - 10V",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "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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          "source": "datasheet"
        },
        {
          "name": "Reference input current deviation over full temperature range",
          "symbol": "II(dev)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.8,
          "max": 1.2,
          "conditions": "IKA = 10mA, R1 = 10kΩ, R2 = ∞",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "Minimum cathode current for regulation",
          "symbol": "Imin",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.4,
          "max": 0.6,
          "conditions": "VKA = Vref",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "Off-state cathode current",
          "symbol": "Ioff",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.1,
          "max": 0.5,
          "conditions": "VKA = 36V, Vref = 0",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "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": 13,
          "source": "datasheet"
        },
        {
          "name": "Cathode voltage (recommended)",
          "symbol": "VKA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 36,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Continuous cathode current range (recommended)",
          "symbol": "IKA",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": 1,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Operating free-air temperature range, TL43xxC",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": 0,
          "typ": null,
          "max": 70,
          "conditions": "Natural ventilation, TL43xxC",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Cathode voltage (absolute maximum)",
          "symbol": "VKA",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 37,
          "conditions": "",
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        },
        {
          "name": "Continuous cathode current range (absolute maximum)",
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          "min": -100,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Reference input current (absolute maximum)",
          "symbol": "II(ref)",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -0.05,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature range",
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          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance (LP package)",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 140,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (top) thermal resistance (LP package)",
          "symbol": "RθJC(top)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 55,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
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      ]
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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