main
Ray Set visibility: public 6f151eb 10d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "mm1z5254b",
  "title": "MM1Z5254B",
  "brief": "ST Semtech Zener Diodes, SOD-123. 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",
    "diodes",
    "mm1z5254b",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "MM1Z5254B",
    "manufacturer": "ST Semtech",
    "package": "SOD-123",
    "pin_count": 2,
    "category": "Diodes",
    "subcategory": "Zener Diodes",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603065797304729600",
    "parts": {
      "symbol": "mm1z5254b.kicad_sym",
      "footprint": "mm1z5254b.kicad_mod",
      "model_3d": "mm1z5254b-hero.glb",
      "model_3d_plain": "mm1z5254b-etched.glb",
      "model_3d_step": "mm1z5254b-etched.step",
      "model_3d_step_plain": "mm1z5254b.step",
      "lbr": "mm1z5254b.lbr"
    },
    "distributor_links": {
      "lcsc": "C7464221"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T22:50:58Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Cathode",
        "type": "passive",
        "description": "Cathode terminal of the Zener diode, identified on the package by the cathode line in the marking (\"III\" = Cathode line)."
      },
      {
        "number": "2",
        "name": "Anode",
        "type": "passive",
        "description": "Anode terminal of the Zener diode, opposite the cathode."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The PINNING table in the extracted text is garbled: the label 'Anode' appears above the Top View and; The datasheet gives no per-pin electrical limits. Pin types are set to passive for a two-terminal Ze; The only package given for this family is SOD-123, so it was used directly. MM1Z5254B is listed in t"
        ],
        "pages_sent": 4,
        "cost_usd": 0.0212,
        "at": "2026-10-17T22:49:24"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603065797304729600",
        "pages": 4,
        "sha256": "34ce15c3c8c6df9b",
        "source_tier": "lcsc"
      },
      "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": "mm1z5254b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.5,
          1.6,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "132323445e3d1f9231e81c083cd88a33cd204dd8b96063bb2ed1f3ab4470c7e7",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mm1z5254b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.5,
          1.6,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "ae47a2f5148cd054f37d86856385b7a61bef81a880f72666d1dc6d7156fb78eb",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ST Semtech",
      "Package": "SOD-123",
      "Category": "Diodes",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "34ce15c3c8c6df9b8bec4f8008cdba77fa02730fe97d8d774e4ff671fbc5880b",
      "rows": [
        {
          "name": "Zener voltage (VZT)",
          "symbol": "VZT",
          "kind": "electrical",
          "unit": "V",
          "min": 25.65,
          "typ": null,
          "max": 28.35,
          "conditions": "IZT = 4.6 mA; pulsed 20 ms (note 1)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Zener voltage tolerance",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "Printed as approximately ±5% (suffix B)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Dynamic impedance (ZZT)",
          "symbol": "ZZT",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 41,
          "conditions": "IZT = 4.6 mA; AC 1 kHz, IZ(AC) = 0.1 IZ(DC) (note 2)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dynamic impedance at knee (ZZK)",
          "symbol": "ZZK",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 600,
          "conditions": "IZK = 0.25 mA; AC 1 kHz, IZ(AC) = 0.1 IZ(DC) (note 2)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Reverse current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VR = 21 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "TL = 75℃ (note 1)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature range",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction to ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": null,
          "max": 340,
          "conditions": "Mounted on FR-4 PCB 38×38×1.6 mm, single-sided Cu pad 25 mm² (note 2)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction to lead",
          "symbol": "RθJL",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "FR-4 PCB 89×38 mm (note 1)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Nominal Zener voltage",
          "symbol": "Vznom",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 27,
          "max": null,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "mm1z5254b"
  ],
  "discovery_pitch": "MM1Z5254B (ST Semtech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "mm1z5254b.kicad_sym",
    "mm1z5254b.kicad_mod",
    "mm1z5254b.glb",
    "mm1z5254b.step",
    "mm1z5254b.lbr",
    "docs/hero.png",
    "docs/mm1z5254b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mm1z5254b-hero.glb",
    "mm1z5254b-hero.overlay.json",
    "mm1z5254b-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}