main
Ray Set visibility: public 1bcf536 17d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "mmbt431lt1",
  "title": "MMBT431LT1",
  "brief": "ALJ Voltage Reference, SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
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  "component": {
    "mpn": "MMBT431LT1",
    "manufacturer": "ALJ",
    "package": "SOT-89",
    "pin_count": 3,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Reference",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603369170746548224",
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      "lbr": "mmbt431lt1.lbr"
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    "distributor_links": {
      "lcsc": "C22400467"
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    "distributor_check": {
      "checked_at": "2026-10-18T01:51:04Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "REFERENCE",
        "type": "input",
        "description": "Reference input of the adjustable shunt regulator, where Vref is 2.445 to 2.545 V (typ. 2.495 V) at IKA = 10 mA, and Iref is rated 0.05 to 10 mA."
      },
      {
        "number": "2",
        "name": "ANODE",
        "type": "passive",
        "description": "Common anode terminal of the shunt regulator, which must carry at least IKA(min) = 0.3 mA for regulation, with the absolute cathode-to-anode limits given in the ratings table."
      },
      {
        "number": "3",
        "name": "CATHODE",
        "type": "passive",
        "description": "Cathode terminal whose voltage can be adjusted up to 36 V, with absolute maximum VKA of 37 V and continuous cathode current range of -100 to +150 mA."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet gives only a numbered text list (1. REFERENCE, 2. ANODE, 3. CATHODE) and no pin-out fi; The ANODE description is partly inferred: the datasheet states IKA(min) and the absolute cathode lim; Part-number inconsistency: the header and title say MMBT431LT1, while the description says MMT431LT1"
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        "at": "2026-10-18T01:49:20"
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        "pages": 4,
        "sha256": "2ebed224d662b431",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
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        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
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      "footprint": "viewers/footprint.html"
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        "seat": "z = 0",
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        "sha256": "844c0bb504d0c383535d9845c6376fe7a4053241a2ede8d8ef694df3fcfc37c8",
        "checked": "2026-10-18",
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  "metadata": {
    "specs": {
      "Manufacturer": "ALJ",
      "Package": "SOT-89",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "2ebed224d662b431965ce703c4382c79e82ad04fd624bd79cf64f1e02b65a05b",
      "rows": [
        {
          "name": "Cathode Voltage",
          "symbol": "VKA",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 37,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Cathode Current Range (Continuous)",
          "symbol": "IKA",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -100,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Reference Input Current Range",
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          "kind": "absolute_maximum",
          "unit": "mA",
          "min": 0.05,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Power Dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance from Junction to Ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 250,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating Junction Temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
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        },
        {
          "name": "Operating Ambient Temperature Range",
          "symbol": "Topr",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature Range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Reference input voltage",
          "symbol": "Vref",
          "kind": "electrical",
          "unit": "V",
          "min": 2.445,
          "typ": 2.495,
          "max": 2.545,
          "conditions": "VKA=VREF, IKA=10mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Deviation of reference input voltage over temperature",
          "symbol": "△Vref /△T",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 4.5,
          "max": 17,
          "conditions": "VKA=VREF, IKA=10mA, Tmin≤Ta≤Tmax",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Ratio of change in reference input voltage to change in cathode voltage",
          "symbol": "△Vref /△VKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -1,
          "max": -2.7,
          "conditions": "IKA=10mA, △VKA=10V~VREF",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Ratio of change in reference input voltage to change in cathode voltage",
          "symbol": "△Vref /△VKA",
          "kind": "electrical",
          "unit": "mV/V",
          "min": null,
          "typ": -0.5,
          "max": -2,
          "conditions": "IKA=10mA, △VKA=36V~10V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Reference input current",
          "symbol": "lref",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 1.5,
          "max": 4,
          "conditions": "IKA=10mA, R1=10kΩ, R2=∞",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Deviation of reference input current over full temperature range",
          "symbol": "△lref /△T",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.4,
          "max": 1.2,
          "conditions": "lKA=10mA, R1=10kΩ, R2=∞, Ta=full Temperature",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Minimum cathode current for regulation",
          "symbol": "IKA(min)",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "VKA=VREF",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Off-state cathode Current",
          "symbol": "IKA(OFF)",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.05,
          "max": 0.2,
          "conditions": "VKA=36V, VREF=0",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dynamic impedance",
          "symbol": "ZKA",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 0.15,
          "max": 0.5,
          "conditions": "VKA=VREF, f≤1.0kHz, IKA=1 to 100mA",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_pitch": "MMBT431LT1 (ALJ) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}