main
Ray Set visibility: public 6ad2c6e 8d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "tl431af",
  "title": "TL431AF",
  "brief": "HTC Korea TAEJIN Tech Voltage Reference, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "tl431af",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "TL431AF",
    "manufacturer": "HTC Korea TAEJIN Tech",
    "package": "SOT-89-3",
    "pin_count": 3,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Reference",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586183374972706816",
    "parts": {
      "symbol": "tl431af.kicad_sym",
      "footprint": "tl431af.kicad_mod",
      "model_3d": "tl431af-hero.glb",
      "model_3d_plain": "tl431af-etched.glb",
      "model_3d_step": "tl431af-etched.step",
      "model_3d_step_plain": "tl431af.step",
      "lbr": "tl431af.lbr"
    },
    "distributor_links": {
      "lcsc": "C126094"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T18:11:42Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Reference",
        "type": "input",
        "description": "Reference voltage input of the shunt regulator, nominally 2.495 V (TL431A tolerance 2.470 to 2.520 V at VKA = VREF, IK = 10 mA), with reference input current IREF of 1.8 uA typical and 4.0 uA maximum."
      },
      {
        "number": "2",
        "name": "Anode",
        "type": "power_in",
        "description": "Ground connection of the device, which must carry the cathode current back to the circuit ground, with cathode current held at or above the 0.5 mA minimum for regulation (IK(MIN))."
      },
      {
        "number": "3",
        "name": "Cathode",
        "type": "power_in",
        "description": "Cathode is the regulated shunt node, recommended for operation from VREF up to 40 V with cathode current of 0.5 to 100 mA, and the absolute maximum is 42 V and 150 mA continuous."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The SOT-89 pin-configuration drawing on page 4 is image-only and does not appear in the extracted te; The datasheet labels the Cathode as 'Input Supply Voltage' and the Anode as 'Ground'. I used power_i; The datasheet does not state a separate pinout for the TL431AF beyond the shared TO-92/SOT-23/SOT-89"
        ],
        "pages_sent": 12,
        "cost_usd": 0.0396,
        "at": "2026-10-18T18:09:47"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586183374972706816",
        "pages": 12,
        "sha256": "0a0d5fc0a3221190",
        "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": "tl431af.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          4.5,
          1.52
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "844c0bb504d0c383535d9845c6376fe7a4053241a2ede8d8ef694df3fcfc37c8",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tl431af-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          4.5,
          1.52
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "ca2d306827d29621eee817471155e6696b6a5e7fa32c872498f5128d5644a80b",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HTC Korea TAEJIN Tech",
      "Package": "SOT-89-3",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "0a0d5fc0a322119015c6323473cf5ab4838370b4fd2ea536b3056c3983cd0d5d",
      "rows": [
        {
          "name": "Reference Input Voltage (TL431A, 1%)",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 2.47,
          "typ": 2.495,
          "max": 2.52,
          "conditions": "VKA =VREF, IK =10mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Deviation of Reference Input Voltage",
          "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-VREF)",
          "symbol": "ΔVREF/ΔVKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1.4,
          "max": -2.7,
          "conditions": "IK =10mA, ΔVKA=10V -VREF",
          "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": "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",
          "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": "Minimum Cathode Current for Regulation",
          "symbol": "IK(MIN)",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 0.5,
          "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 (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"
        },
        {
          "name": "Cathode Voltage (recommended; minimum is VREF)",
          "symbol": "VKA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Cathode Current",
          "symbol": "IK",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": 0.5,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "tl431af"
  ],
  "discovery_pitch": "TL431AF (HTC Korea TAEJIN Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tl431af.kicad_sym",
    "tl431af.kicad_mod",
    "tl431af.glb",
    "tl431af.step",
    "tl431af.lbr",
    "docs/hero.png",
    "docs/tl431af-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tl431af-hero.glb",
    "tl431af-hero.overlay.json",
    "tl431af-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}