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Ray Set visibility: public f846a5d 8h ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "mmsz5257b-7-f",
  "title": "MMSZ5257B-7-F",
  "brief": "Diodes Incorporated 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",
    "mmsz5257b-7-f",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "MMSZ5257B-7-F",
    "manufacturer": "Diodes Incorporated",
    "package": "SOD-123",
    "pin_count": 2,
    "category": "Diodes",
    "subcategory": "Zener Diodes",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586186527038705664",
    "parts": {
      "symbol": "mmsz5257b-7-f.kicad_sym",
      "footprint": "mmsz5257b-7-f.kicad_mod",
      "model_3d": "mmsz5257b-7-f-hero.glb",
      "model_3d_plain": "mmsz5257b-7-f-etched.glb",
      "model_3d_step": "mmsz5257b-7-f-etched.step",
      "model_3d_step_plain": "mmsz5257b-7-f.step",
      "lbr": "mmsz5257b-7-f.lbr"
    },
    "distributor_links": {
      "lcsc": "C151433"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T14:53:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "K",
        "type": "passive",
        "description": "Cathode, the terminal marked by the cathode band; it goes positive in reverse (Zener) breakdown, and the 33V part (MMSZ5257B) has VZ 31.35V to 34.65V at IZT = 3.8mA."
      },
      {
        "number": "2",
        "name": "A",
        "type": "passive",
        "description": "Anode, the terminal opposite the cathode band; forward voltage is 0.9V at IF = 10mA."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet does not print pin numbers. It only gives the polarity as 'Cathode Band' on page 1, an",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 5,
        "cost_usd": 0.1342,
        "at": "2026-10-17T14:51:21"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586186527038705664",
        "pages": 5,
        "sha256": "7c7ac7a58521db27",
        "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": "mmsz5257b-7-f.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": "mmsz5257b-7-f-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": "fe728aead6d45bd41427a6e68ea1171f9d9169a11b8925226c8a6f01a4fb5b11",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Diodes Incorporated",
      "Package": "SOD-123",
      "Category": "Diodes",
      "Pins": "2"
    },
    "appearance": {
      "contacts": {
        "quote": " Terminals: Matte Tin Finish Annealed over Alloy 42 Leadframe (Lead Free Plating). Solderable per MIL-STD-202, Method 208",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "7c7ac7a58521db27991b0d8dbd84d04d00fc84bc85af85bed1c8d31b20ebd200"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "7c7ac7a58521db27991b0d8dbd84d04d00fc84bc85af85bed1c8d31b20ebd200",
      "rows": [
        {
          "name": "Zener voltage (Nom 33 V, Min 31.35 V, Max 34.65 V)",
          "symbol": "VZ",
          "kind": "electrical",
          "unit": "V",
          "min": 31.35,
          "typ": 33,
          "max": 34.65,
          "conditions": "@ IZT = 3.8mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Zener impedance",
          "symbol": "ZZT",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 58,
          "conditions": "@ IZT = 3.8mA, f = 1KHz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Zener impedance",
          "symbol": "ZZK",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 700,
          "conditions": "@ IZK = 0.25mA, f = 1KHz",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum reverse leakage current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "@ VR = 25V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "@ TL = +75°C (Note 4)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 370,
          "conditions": "@ TA = +25°C (Note 5)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating and storage temperature range",
          "symbol": "TJ, TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Forward voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.9,
          "max": null,
          "conditions": "@ IF = 10mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction to ambient air",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 338,
          "max": null,
          "conditions": "(Note 5)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction to lead",
          "symbol": "RΘJL",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 132,
          "max": null,
          "conditions": "(Note 4)",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "mmsz5257b-7-f"
  ],
  "discovery_pitch": "MMSZ5257B-7-F (Diodes Incorporated) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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    "path": "docs/hero.png"
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    "viewers/symbol.html",
    "viewers/footprint.html",
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    "mmsz5257b-7-f-hero.overlay.json",
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  "visibility": {
    "public": true
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}