TL431IZT

{
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  "type": "component",
  "slug": "tl431izt",
  "title": "TL431IZT",
  "brief": "STMicroelectronics Voltage Reference, TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
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  "component": {
    "mpn": "TL431IZT",
    "manufacturer": "STMicroelectronics",
    "package": "TO-92",
    "pin_count": 3,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Reference",
    "datasheet": "https://www.st.com/resource/en/datasheet/tl431izt.pdf",
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      "lcsc": "C2156686"
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    "pins": [
      {
        "number": "1",
        "name": "Cathode",
        "type": "passive",
        "description": "Cathode (K) terminal of the shunt regulator; operates over a cathode-to-anode voltage of Vref to 36 V and a cathode current range of 1 to 100 mA (absolute max -100 to +150 mA), with typical dynamic impedance 0.22 Ω."
      },
      {
        "number": "2",
        "name": "Anode",
        "type": "passive",
        "description": "Anode (A) terminal of the shunt regulator, forming the return path for the cathode current; cathode-to-anode voltage rating is Vref to 36 V (absolute max 37 V)."
      },
      {
        "number": "3",
        "name": "Ref",
        "type": "input",
        "description": "Reference input to the internal comparator; reference input current range is -0.05 to +10 mA (absolute max) with typical Iref of 1.8 µA, used with external resistor divider to program the output voltage from 2.5 V to 36 V."
      }
    ],
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        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 22,
        "cost_usd": 0.3314,
        "at": "2026-09-23T16:53:12"
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      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/tl431izt.pdf",
        "pages": 22,
        "sha256": "d174b1869a9d426d",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
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    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
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        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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        "zmin_mm": -2.5,
        "centre_offset_mm": 0.542,
        "footprint_binding": "identity",
        "sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
        "checked": "2026-10-07",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "TO-92",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "d174b1869a9d426d",
      "rows": [
        {
          "name": "Reference input voltage (Tamb = 25 °C)",
          "symbol": "Vref",
          "kind": "tolerance",
          "unit": "V",
          "min": 2.44,
          "typ": 2.495,
          "max": 2.55,
          "conditions": "VKA = Vref, Ik = 10 mA, Tamb = 25 °C",
          "source_page": 5,
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          "symbol": "Vref",
          "kind": "tolerance",
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          "max": 2.58,
          "conditions": "VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax",
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          "conditions": "VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax",
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        },
        {
          "name": "Ratio of change in reference input voltage to change in cathode-anode voltage (VKA = 10 V to Vref)",
          "symbol": "ΔVref/ΔVKA",
          "kind": "voltage_coefficient",
          "unit": "mV/V",
          "min": -2.7,
          "typ": -2,
          "max": -1.4,
          "conditions": "Ik = 10 mA, VKA = 10 V to Vref",
          "source_page": 7,
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        },
        {
          "name": "Ratio of change in reference input voltage to change in cathode-anode voltage (VKA = 36 V to 10 V)",
          "symbol": "ΔVref/ΔVKA",
          "kind": "voltage_coefficient",
          "unit": "mV/V",
          "min": -1,
          "typ": null,
          "max": null,
          "conditions": "Ik = 10 mA, VKA = 36 V to 10 V",
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        {
          "name": "Reference input current (Tamb = 25 °C)",
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          "kind": "electrical",
          "unit": "µA",
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          "typ": 1.8,
          "max": 4,
          "conditions": "Ik = 10 mA, R1 = 10 k, R2 = Tamb = 25 °C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Reference input current over temperature range",
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          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 6.5,
          "conditions": "Ik = 10 mA, R1 = 10 k, R2 = Tmin ≤ Tamb ≤ Tmax",
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          "name": "Reference input current deviation over temperature range",
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          "unit": "µA",
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          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Minimum cathode current for regulation",
          "symbol": "Imin",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.5,
          "max": 1,
          "conditions": "VKA = Vref",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Off-state cathode current",
          "symbol": "Ioff",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 2.6,
          "max": 1000,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Dynamic impedance",
          "symbol": "ZKA",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 0.22,
          "max": 0.5,
          "conditions": "VKA = Vref, Ik = 1 to 100 mA, f ≤ 1 kHz",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Cathode to anode voltage (absolute maximum)",
          "symbol": "VKA",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 37,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Continuous cathode current range (absolute maximum)",
          "symbol": "Ik",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -100,
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          "max": 150,
          "conditions": "",
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        },
        {
          "name": "Reference input current range (absolute maximum)",
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          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -0.05,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
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          "unit": "°C",
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          "conditions": "",
          "source_page": 4,
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        },
        {
          "name": "Cathode to anode voltage (recommended operating range, upper bound)",
          "symbol": "VKA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 36,
          "conditions": "Lower bound printed as Vref (not a numeric value)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Cathode current (recommended operating range)",
          "symbol": "Ik",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": 1,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Operating free-air temperature range (TL431I/AI - TL432I/AI)",
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          "unit": "°C",
          "min": -40,
          "typ": null,
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          "conditions": "",
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          "source": "datasheet"
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          "name": "Thermal resistance junction to case (TO-92)",
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          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 57,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction to ambient (TO-92)",
          "symbol": "Rthja",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 200,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
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  "discovery_pitch": "TL431IZT (STMicroelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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  "updated_at": "2026-09-25T09:59:05.664Z"
}