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Ray Set visibility: public e103df9 6h ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "zm4728a",
  "title": "ZM4728A",
  "brief": "MSKSEMI 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",
  "tags": [
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    "manufacturer": "MSKSEMI",
    "package": "LL-41",
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    "subcategory": "Zener Diodes",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/7d0a901b121c70408dca0e0a44401b02.pdf",
    "parts": {
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      "footprint": "zm4728a.kicad_mod",
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      "model_3d_step": "zm4728a.step",
      "lbr": "zm4728a.lbr",
      "model_3d_plain": "zm4728a.glb"
    },
    "distributor_links": {
      "lcsc": "C2943021",
      "digikey": "5399-ZM4728ATR-ND",
      "mouser": "821-ZM4728A"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T04:49:56Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "5399-ZM4728ATR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "821-ZM4728A",
        "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": {
      "extractor": "extract_pins",
      "factory_chain": {
        "factory": "2.0.0",
        "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": 5,
        "cost_usd": 0.0011,
        "at": "2026-10-21T04:47:22"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/7d0a901b121c70408dca0e0a44401b02.pdf",
        "pages": 5,
        "sha256": "2fe699a8fd952775",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "zm4728a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          2.2,
          2.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3b1fa81e2e3ea0ef2e0ddbeb3f62b354a14174610250e6069a5076959a63f835",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "MSKSEMI",
      "Package": "LL-41",
      "Category": "Diodes",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "2fe699a8fd952775503fab5704fb1e5d139c95f36b4228755301a50bee511e8d",
      "rows": [
        {
          "name": "Zener tolerance (suffix A, ±5%)",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "Suffix A = ±5% Zener voltage tolerance",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance (Zener current)",
          "symbol": "ZZT",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "at IZT = 76 mA, 60 Hz AC at 10% of IZT",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance (knee current)",
          "symbol": "ZZK",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "at IZK = 1 mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reverse current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "at VR = 1 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum surge current",
          "symbol": "IZSM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 1375,
          "conditions": "Ta = 25℃; 1/120 s surge superimposed on IZT",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum regulator current",
          "symbol": "IZM",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 275,
          "conditions": "Ta = 25℃",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "Valid provided electrodes are kept at ambient temperature",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 175,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 175,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction to ambient air",
          "symbol": "RthA",
          "kind": "thermal",
          "unit": "K/mW",
          "min": null,
          "typ": 0.3,
          "max": null,
          "conditions": "Valid provided electrodes are kept at ambient temperature",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Forward voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "at IF = 100 mA",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
    "zm4728a"
  ],
  "discovery_pitch": "ZM4728A (MSKSEMI) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
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    "zm4728a.kicad_mod",
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    "zm4728a.step",
    "zm4728a.lbr",
    "docs/hero.png",
    "docs/zm4728a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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    "zm4728a-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}