main
Ray Set visibility: public 5db3974 8h ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "zm4744a",
  "title": "ZM4744A",
  "brief": "ST(Semtech) 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.",
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    "subcategory": "Zener Diodes",
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    "distributor_links": {
      "lcsc": "C41253",
      "digikey": "6709-ZM4744A-ND",
      "mouser": "821-ZM4744A"
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    "distributor_check": {
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      "source": "Component Ocean /api/assign-pns",
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        "status": "found",
        "lifecycle": "Active"
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        "pn": "821-ZM4744A",
        "status": "found",
        "lifecycle": "Part Number Change"
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    "pins": [
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        "name": "K",
        "type": "passive",
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    "provenance": {
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        "consensus_model": null,
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
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        "pages_sent": 3,
        "cost_usd": 0.0009,
        "at": "2026-10-21T05:02:12"
      },
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        "pages": 3,
        "sha256": "ff41c4dbf24547f7",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
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        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
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    "viewers": {
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    "models_3d": [
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        "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": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ST(Semtech)",
      "Package": "LL-41",
      "Category": "Diodes",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "ff41c4dbf24547f7b5ef60b5bc8eac3e59d0e37ba49ea7c4bcafe3455301e463",
      "rows": [
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          "name": "Zener voltage ZM4744 (nominal, as printed)",
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          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "at IZT 17 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Zener voltage tolerance (suffix A)",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "suffix A = ±5%; standard ±10%",
          "source_page": 1,
          "source": "datasheet"
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          "max": 14,
          "conditions": "at IZT 17 mA",
          "source_page": 2,
          "source": "datasheet"
        },
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          "name": "Dynamic resistance",
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          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 700,
          "conditions": "at IZK 0.25 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Reverse current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "at VR 11.4 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum surge current",
          "symbol": "IZSM",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 304,
          "conditions": "1/2 square wave or sine pulse, 1/120 s, superimposed on IZT",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum regulator current",
          "symbol": "IZM",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 61,
          "conditions": "Ta = 25℃; valid provided electrodes kept at ambient temperature",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Forward voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.2,
          "conditions": "at IF 200 mA",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "Valid provided that electrodes are kept at ambient temperature",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 175,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
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        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
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          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 175,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction to ambient air",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "K/W",
          "min": null,
          "typ": null,
          "max": 170,
          "conditions": "Valid provided that electrodes are kept at ambient temperature",
          "source_page": 1,
          "source": "datasheet"
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  "variants": [],
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  "discovery_triggers": [
    "zm4744a"
  ],
  "discovery_pitch": "ZM4744A (ST(Semtech)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "visibility": {
    "public": true
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}