main
Ray Set visibility: public 6604bee 11d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "zm4731a",
  "title": "ZM4731A",
  "brief": "YFW Zener Diodes, LL-41. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "manufacturer": "YFW",
    "package": "LL-41",
    "pin_count": 2,
    "category": "Diodes",
    "subcategory": "Zener Diodes",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603346236112191488",
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    "distributor_links": {
      "lcsc": "C22391979",
      "digikey": "5399-ZM4731ATR-ND",
      "mouser": "821-ZM4731A"
    },
    "distributor_check": {
      "checked_at": "2026-10-15T07:31:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "5399-ZM4731ATR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "821-ZM4731A",
        "status": "found",
        "lifecycle": "Part Number Change"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "K",
        "type": "passive",
        "description": "Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint."
      },
      {
        "number": "2",
        "name": "A",
        "type": "passive",
        "description": "Anode."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "extractor": "extract_pins",
        "primary_model": "cathode-band convention",
        "primary_mode": "convention",
        "consensus_model": null,
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 3,
        "cost_usd": 0.0009,
        "at": "2026-10-15T07:31:29"
      },
      "datasheet": {
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        "pages": 3,
        "sha256": "ce3cb652985a1703",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "zm4731a.step",
        "role": "plain",
        "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": "3b1fa81e2e3ea0ef2e0ddbeb3f62b354a14174610250e6069a5076959a63f835",
        "checked": "2026-10-15",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "YFW",
      "Package": "LL-41",
      "Category": "Diodes",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "ce3cb652985a1703fe5db8a507f210fc451c2fda8cbbc35d1b32d254bd696a87",
      "rows": [
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "Valid provided electrodes kept at ambient temperature",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 175,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 175,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction to ambient air",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 170,
          "conditions": "Electrodes kept at ambient temperature",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Forward voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.2,
          "conditions": "IF = 200 mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Zener voltage tolerance (suffix A)",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Suffix A; datasheet prints +5% only",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance",
          "symbol": "ZZT",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 9,
          "conditions": "At IZT = 58 mA; 60 Hz AC at 10% of IZT",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance (knee)",
          "symbol": "ZZK",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "At IZK = 1 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Reverse current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "At VR = 1 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum surge current",
          "symbol": "IZSM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 1070,
          "conditions": "Non-repetitive 1/120 s surge pulse superimposed on IZT (footnote 4)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum regulator current",
          "symbol": "IZM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 217,
          "conditions": "Ta = 25 °C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Zener voltage (nominal)",
          "symbol": "VZnom",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 4.3,
          "max": null,
          "conditions": "At IZT = 58 mA",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
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  "variants": [],
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  "discovery_triggers": [
    "zm4731a"
  ],
  "discovery_pitch": "ZM4731A (YFW) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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}