main
Ray Set visibility: public 6c34c0d 1d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "se431d-lf",
  "title": "SE431D-LF",
  "brief": "Seaward Elec Voltage References, 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": [
    "component",
    "power management ics",
    "se431d-lf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "SE431D-LF",
    "manufacturer": "Seaward Elec",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Power Management ICs",
    "subcategory": "Voltage References",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/5ee2ad9ec10f4a15b39d6a6a8cd45815.pdf",
    "parts": {
      "symbol": "se431d-lf.kicad_sym",
      "footprint": "se431d-lf.kicad_mod",
      "model_3d": "se431d-lf-hero.glb",
      "model_3d_plain": "se431d-lf-etched.glb",
      "model_3d_step": "se431d-lf-etched.step",
      "model_3d_step_plain": "se431d-lf.step",
      "lbr": "se431d-lf.lbr"
    },
    "distributor_links": {
      "lcsc": "C115759"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T17:05:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Ref",
        "type": "input",
        "description": "Reference input that sets the output voltage through an external resistor divider, with VREF typically 2495 mV and reference current limited to 10 mA absolute maximum."
      },
      {
        "number": "2",
        "name": "Cathode",
        "type": "passive",
        "description": "Shunt regulator cathode (output) that can be set from VREF to 36 V recommended (40 V absolute maximum) and regulates with 0.3 to 100 mA cathode current (150 mA absolute maximum)."
      },
      {
        "number": "3",
        "name": "Anode",
        "type": "power_in",
        "description": "Anode terminal, the reference point (normally ground) for all cathode voltage values in the datasheet."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The MPN SE431D-LF does not name a specific package, and the datasheet offers three SOT-23-family dra; The datasheet does not state pin electrical types. Ref is mapped to input, Cathode to passive, and A",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 8,
        "cost_usd": 0.1574,
        "at": "2026-11-05T17:05:46"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/5ee2ad9ec10f4a15b39d6a6a8cd45815.pdf",
        "pages": 8,
        "sha256": "0b369c4317eb861a",
        "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": "se431d-lf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "se431d-lf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d396ceb3a1def46420bfc53cfe626029cbb4717614f4f5c08a1ff7517349b3ab",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Seaward Elec",
      "Package": "SOT-23",
      "Category": "Power Management ICs",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "0b369c4317eb861a3a04ee9fdbb5edb394105c3b67a8db5bcc5a694c8067ae1a",
      "rows": [
        {
          "name": "Reference voltage (0.5% grade)",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "mV",
          "min": 2483,
          "typ": 2495,
          "max": 2507,
          "conditions": "VKA = VREF, IKA = 10mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference voltage (1% grade)",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "mV",
          "min": 2470,
          "typ": 2495,
          "max": 2520,
          "conditions": "VKA = VREF, IKA = 10mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference voltage (2% grade)",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "mV",
          "min": 2445,
          "typ": 2495,
          "max": 2545,
          "conditions": "VKA = VREF, IKA = 10mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Deviation of reference voltage over full temperature range",
          "symbol": "VI(dev)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 8,
          "max": 17,
          "conditions": "VKA = VREF, IKA = 10mA, TA = 0°C to 125°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Ratio of change in reference voltage to change in cathode voltage",
          "symbol": "ΔVREF/ΔVKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": 0.2,
          "max": 2.7,
          "conditions": "IKA = 3mA, ΔVKA = 10 V - VREF",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference current",
          "symbol": "IREF",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.3,
          "max": 4,
          "conditions": "IKA = 10mA, R1=10kΩ, R2 = ∞",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Deviation of reference current over full temperature range",
          "symbol": "II(dev)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.13,
          "max": 4,
          "conditions": "IKA = 10mA, R1=10kΩ, R2 = ∞, TA = 0°C to 125°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Minimum cathode current for regulation",
          "symbol": "IMIN",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.15,
          "max": 0.3,
          "conditions": "VKA = VREF",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Off-state cathode current",
          "symbol": "IOFF",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.4,
          "max": 1,
          "conditions": "VKA = 36 V, VREF = 0",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Dynamic impedance",
          "symbol": "ZKA",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 0.08,
          "max": 0.7,
          "conditions": "IKA = 1mA to 100mA, VKA = VREF, f ≤ 1kHZ",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Cathode voltage (recommended)",
          "symbol": "VKA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 36,
          "conditions": "Minimum printed as VREF",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Cathode current for regulation (recommended)",
          "symbol": "IK",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": 0.3,
          "typ": null,
          "max": 100,
          "conditions": "for regulation",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Cathode voltage (absolute maximum)",
          "symbol": "VKA",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "Voltage with respect to anode terminal",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Continuous cathode current",
          "symbol": "IKA",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference current (absolute maximum)",
          "symbol": "IREF",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature range",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Lead temperature (soldering)",
          "symbol": "TLEAD",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "10 seconds",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-to-ambient (SOT-23-3)",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 230,
          "conditions": "SOT-23-3; mounted onboard, still air, 1 W applied",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Package power rating at TA=25°C (SOT-23-3)",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 435,
          "conditions": "SOT-23-3, TA=25°C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Package power rating at TA=50°C (SOT-23-3)",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 326,
          "conditions": "SOT-23-3, TA=50°C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Package power rating at TA=70°C (SOT-23-3)",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 239,
          "conditions": "SOT-23-3, TA=70°C",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "se431d-lf"
  ],
  "discovery_pitch": "SE431D-LF (Seaward Elec) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
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    "path": "docs/hero.png"
  },
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    "se431d-lf.kicad_mod",
    "se431d-lf.glb",
    "se431d-lf.step",
    "se431d-lf.lbr",
    "docs/hero.png",
    "docs/se431d-lf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "se431d-lf-hero.glb",
    "se431d-lf-hero.overlay.json",
    "se431d-lf-etched.glb"
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  "visibility": {
    "public": true
  }
}