main
Ray Set visibility: public 2c35a39 11h ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "a4481kljtr-t",
  "title": "A4481KLJTR-T",
  "brief": "Allegro MicroSystems, LLC Linear Voltage Regulators (LDO), SOIC-8-EP. 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",
    "a4481kljtr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "A4481KLJTR-T",
    "manufacturer": "Allegro MicroSystems, LLC",
    "package": "SOIC-8-EP",
    "pin_count": 9,
    "category": "Power Management",
    "subcategory": "Linear Voltage Regulators (LDO)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/5790f17024fb650ee6a2985a3df302e3.pdf",
    "parts": {
      "symbol": "a4481kljtr-t.kicad_sym",
      "footprint": "a4481kljtr-t.kicad_mod",
      "model_3d": "a4481kljtr-t-hero.glb",
      "model_3d_plain": "a4481kljtr-t-etched.glb",
      "model_3d_step": "a4481kljtr-t-etched.step",
      "model_3d_step_plain": "a4481kljtr-t.step",
      "lbr": "a4481kljtr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C6486473",
      "digikey": "620-A4481KLJTR-TTR-ND",
      "mouser": "250-A4481KLJTR-T"
    },
    "distributor_check": {
      "checked_at": "2026-11-02T19:37:07Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "620-A4481KLJTR-TTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "250-A4481KLJTR-T",
        "status": "found"
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    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Input voltage pin for the regulator, operating from 5.25 V to 40 V with a 50 V load dump rating."
      },
      {
        "number": "2",
        "name": "VIN",
        "type": "power_in",
        "description": "Input voltage pin for the regulator, operating from 5.25 V to 40 V with a 50 V load dump rating."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect pin."
      },
      {
        "number": "4",
        "name": "ENB",
        "type": "input",
        "description": "Logic enable input from a microcontroller or DSP that must be above 2 V to operate, and is rated to 50 V so it can be connected directly to VIN."
      },
      {
        "number": "5",
        "name": "POK",
        "type": "output",
        "description": "Open-drain regulator fault detection output that requires an external pull-up resistor and is pulled low when ENB goes low, UVLO occurs, TSD occurs, or UV/OVP occurs."
      },
      {
        "number": "6",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "8",
        "name": "VOUT",
        "type": "power_out",
        "description": "5 V ±1% regulator output capable of supplying up to 50 mA of load current."
      },
      {
        "number": "9",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "exposed pad 9 added from the footprint"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0846,
        "at": "2026-11-02T19:36:30"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/5790f17024fb650ee6a2985a3df302e3.pdf",
        "pages": 10,
        "sha256": "5264745c8eb6db5f",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "footprint_binding": "identity",
        "sha256": "2d6f7e774e8143e3320cbd59eb5be9f3b7864614644e3b072006e1eb05fb7fa6",
        "checked": "2026-11-02",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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        "checked": "2026-11-02",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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    "package_dims": {
      "package_code": "LJ",
      "source_page": 9,
      "D": {
        "nom_mm": 4.9,
        "range_mm": [
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      "E1": {
        "nom_mm": 3.9,
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      "A": {
        "nom_mm": 1.73,
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      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
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        "verdict": "PASS",
        "reasons": [
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems, LLC",
      "Package": "SOIC-8-EP",
      "Category": "Power Management",
      "Pins": "9"
    },
    "appearance": {
      "contacts": {
        "quote": "exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte-tin leadframe plating.",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
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      "version": 1,
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        {
          "name": "VOUT pin voltage",
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          "kind": "absolute_maximum",
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          "min": -0.3,
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          "max": 32,
          "conditions": "Independent of VIN",
          "source_page": 2,
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          "name": "All other pins voltage",
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        {
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          "min": -40,
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          "max": 165,
          "conditions": "",
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          "source": "datasheet"
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        {
          "name": "Storage Temperature Range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
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          "conditions": "",
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        {
          "name": "Operating Temperature Range",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "Selection guide, K temperature range",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance (Junction to Ambient)",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 35,
          "max": null,
          "conditions": "eSOIC-8 (LJ) package",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating Input Voltage",
          "symbol": "VIN",
          "kind": "electrical",
          "unit": "V",
          "min": 5.25,
          "typ": 5.35,
          "max": 40,
          "conditions": "ENB high",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VIN UVLO Start Voltage",
          "symbol": "VIN(START)",
          "kind": "electrical",
          "unit": "V",
          "min": 4.75,
          "typ": null,
          "max": 5.2,
          "conditions": "VIN rising, ENB high",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VIN UVLO Stop Voltage",
          "symbol": "VIN(STOP)",
          "kind": "electrical",
          "unit": "V",
          "min": 4.55,
          "typ": null,
          "max": 5,
          "conditions": "VIN falling, ENB high",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "VIN UVLO Hysteresis",
          "symbol": "VIN(HYS)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": null,
          "conditions": "VIN(START) – VIN(STOP)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Quiescent Current",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3.4,
          "max": null,
          "conditions": "VIN = 5.25 V, ENB high",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Sleep Supply Current",
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          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 1,
          "max": 10,
          "conditions": "VIN = 5.25 V, ENB low",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Output Voltage Accuracy",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": 4.95,
          "typ": 5,
          "max": 5.05,
          "conditions": "IOUT = 25 mA, VIN = 5.25 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "5 mA < IOUT < 50 mA, VIN = 5.25 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Capacitance Range",
          "symbol": "COUT",
          "kind": "electrical",
          "unit": "µF",
          "min": 3,
          "typ": 4.7,
          "max": 10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Startup Time",
          "symbol": "tSTART",
          "kind": "timing",
          "unit": "ms",
          "min": 0.7,
          "typ": 1.5,
          "max": 2.3,
          "conditions": "COUT ≤ 4.7 µF, Load = 100 Ω ±5% (50 mA)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ENB Threshold rising",
          "symbol": "VENB(H)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "VENB rising",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ENB Threshold falling",
          "symbol": "VENB(L)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.8,
          "typ": null,
          "max": null,
          "conditions": "VENB falling",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ENB Resistance",
          "symbol": "RENB",
          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ENB Filter/Deglitch Time",
          "symbol": "td(EN,FILT)",
          "kind": "timing",
          "unit": "µs",
          "min": 10,
          "typ": 15,
          "max": 25,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current Limit",
          "symbol": "ILIM",
          "kind": "electrical",
          "unit": "mA",
          "min": -55,
          "typ": -80,
          "max": -140,
          "conditions": "VOUT = 5 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Foldback Current",
          "symbol": "IFBK",
          "kind": "electrical",
          "unit": "mA",
          "min": -13,
          "typ": -23,
          "max": -35,
          "conditions": "VOUT = 0 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal Shutdown Threshold",
          "symbol": "TTSD",
          "kind": "electrical",
          "unit": "°C",
          "min": 165,
          "typ": null,
          "max": null,
          "conditions": "TJ rising",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Thermal Shutdown Hysteresis",
          "symbol": "THYS",
          "kind": "electrical",
          "unit": "°C",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VOUT OV Threshold rising",
          "symbol": "VOV(H)",
          "kind": "electrical",
          "unit": "V",
          "min": 5.15,
          "typ": 5.33,
          "max": 5.5,
          "conditions": "VOUT rising",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VOUT OV Threshold falling",
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          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 5.3,
          "max": null,
          "conditions": "VOUT falling",
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        },
        {
          "name": "VOUT OV Hysteresis",
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          "kind": "electrical",
          "unit": "mV",
          "min": 15,
          "typ": 30,
          "max": 50,
          "conditions": "VOV(H) – VOV(L)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VOUT UV Threshold rising",
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          "min": null,
          "typ": 4.71,
          "max": null,
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          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VOUT UV Threshold falling",
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          "kind": "electrical",
          "unit": "V",
          "min": 4.5,
          "typ": 4.68,
          "max": 4.85,
          "conditions": "VOUT falling",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "VOUT UV Hysteresis",
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          "kind": "electrical",
          "unit": "mV",
          "min": 15,
          "typ": 30,
          "max": 50,
          "conditions": "VUV(H) – VUV(L)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VOUT Output Disconnect Threshold",
          "symbol": "VDISC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 7.2,
          "max": null,
          "conditions": "VOUT rising",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "POK Output Low Voltage",
          "symbol": "VPOK(L)",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 150,
          "max": 400,
          "conditions": "ENB high, VIN ≥ 5.25 V, IPOK = 4 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "POK Leakage Current",
          "symbol": "IPOK(LKG)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "VPOK = 3.3 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "OV and UV Filter/Deglitch Times",
          "symbol": "td(FILT)",
          "kind": "timing",
          "unit": "µs",
          "min": 10,
          "typ": 15,
          "max": 20,
          "conditions": "Applies to undervoltage of the VOUT voltages",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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