TL431ASF

{
  "schema_version": 1,
  "type": "component",
  "slug": "tl431asf",
  "title": "TL431ASF",
  "brief": "HTC Korea TAEJIN Tech Voltage Reference, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "power management (pmic)",
    "tl431asf",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "TL431ASF",
    "manufacturer": "HTC Korea TAEJIN Tech",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Reference",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586191211447398400",
    "parts": {
      "symbol": "tl431asf.kicad_sym",
      "footprint": "tl431asf.kicad_mod",
      "model_3d": "tl431asf-etched.glb",
      "model_3d_plain": "tl431asf.glb",
      "model_3d_step": "tl431asf-etched.step",
      "model_3d_step_plain": "tl431asf.step",
      "lbr": "tl431asf.lbr"
    },
    "distributor_links": {
      "lcsc": "C262799"
    },
    "pins": [
      {
        "number": "1",
        "name": "REF",
        "type": "input",
        "description": "Reference voltage input; sets the regulated output voltage via external resistor divider; reference input current IREF typ. 1.8 µA, max 4.0 µA (IK = 10 mA, R1 = 10 kΩ, R2 = ∞)."
      },
      {
        "number": "2",
        "name": "A",
        "type": "power_in",
        "description": "Anode terminal; connected to circuit ground; cathode current range (continuous) −100 mA to 150 mA flows from cathode to anode."
      },
      {
        "number": "3",
        "name": "K",
        "type": "passive",
        "description": "Cathode terminal (input supply voltage); regulated cathode-to-anode voltage VKA from VREF (≈ 2.495 V) to 40 V; minimum cathode current for regulation IK(MIN) = 0.5 mA; dynamic impedance ZKA typ. 0.27 Ω (IK = 1 mA-100 mA, f ≤ 1 kHz)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 12,
        "cost_usd": 0.0994,
        "at": "2026-09-21T21:13:58"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586191211447398400",
        "pages": 12,
        "sha256": "66b4ce853f1e463b",
        "source_tier": "lcsc"
      },
      "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"
    },
    "models_3d": [
      {
        "file": "tl431asf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tl431asf-etched.step",
        "role": "eda",
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "15f943c3588b43b4eeee7e76698086f17141aaf3ba41bdab8d3fcef9fc2c4aef",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HTC Korea TAEJIN Tech",
      "Package": "SOT-23",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "66b4ce853f1e463b",
      "rows": [
        {
          "name": "Reference Input Voltage (TL431A, 1%)",
          "symbol": "VREF",
          "kind": "tolerance",
          "unit": "V",
          "min": 2.47,
          "typ": 2.495,
          "max": 2.52,
          "conditions": "VKA = VREF, IK = 10mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Reference Input Current",
          "symbol": "IREF",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 1.8,
          "max": 4,
          "conditions": "IKA=10mA, R1=10kΩ, R2=∞",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Deviation of Reference Input Current over full range",
          "symbol": "ΔIREF/ΔT",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 0.4,
          "max": 1.2,
          "conditions": "IK =10mA, R1=10kΩ, R2=∞, TA =Full Range",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Deviation of Reference Input Voltage over full range",
          "symbol": "ΔVREF/ΔT",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 8,
          "max": 20,
          "conditions": "VKA = VREF, IK =10mA, TA =Full Range",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (ΔVKA=10V)",
          "symbol": "ΔVREF/ΔVKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1.4,
          "max": -2.7,
          "conditions": "IK =10mA, ΔVKA=10V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (ΔVKA=36V-10V)",
          "symbol": "ΔVREF/ΔVKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1,
          "max": -2,
          "conditions": "IK =10mA, ΔVKA=36V-10V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Minimum Cathode Current for Regulation",
          "symbol": "IK(MIN)",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.5,
          "max": null,
          "conditions": "VKA= VREF",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Off-State Cathode Current",
          "symbol": "IK(OFF)",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 0.17,
          "max": 0.9,
          "conditions": "VKA=36V, VREF=0",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Dynamic Impedance",
          "symbol": "ZKA",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 0.27,
          "max": 0.5,
          "conditions": "VKA= VREF, IK =1mA~100mA, f ≤ 1kHz",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Cathode Voltage (recommended)",
          "symbol": "VKA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Cathode Current (recommended)",
          "symbol": "IK",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": 0.5,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Cathode Voltage (absolute maximum)",
          "symbol": "VKA",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 42,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Cathode Current Range (Continuous)",
          "symbol": "IK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -100,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Reference Input Current Range",
          "symbol": "IREF",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -0.05,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature Range",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature Range",
          "symbol": "TOPR",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_triggers": [
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  "discovery_pitch": "TL431ASF (HTC Korea TAEJIN Tech) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "tl431asf.lbr",
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  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T09:55:55.382Z"
}