MMBZ5257BQ-7-F

{
  "schema_version": 1,
  "type": "component",
  "slug": "mmbz5257bq-7-f",
  "title": "MMBZ5257BQ-7-F",
  "brief": "Diodes Incorporated Zener Diodes, SOT-23. 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",
    "mmbz5257bq-7-f",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "MMBZ5257BQ-7-F",
    "manufacturer": "Diodes Incorporated",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Diodes",
    "subcategory": "Zener Diodes",
    "datasheet": "https://www.diodes.com/assets/Datasheets/MMBZ5257BQ-7-F.pdf",
    "parts": {
      "symbol": "mmbz5257bq-7-f.kicad_sym",
      "footprint": "mmbz5257bq-7-f.kicad_mod",
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      "model_3d_step": "mmbz5257bq-7-f-etched.step",
      "model_3d_step_plain": "mmbz5257bq-7-f.step",
      "lbr": "mmbz5257bq-7-f.lbr"
    },
    "distributor_links": {
      "lcsc": "C5244941",
      "digikey": "31-MMBZ5257BQ-7-FTR-ND",
      "mouser": "621-MMBZ5257BQ-7-F"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T03:27:41Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "31-MMBZ5257BQ-7-FTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "621-MMBZ5257BQ-7-F",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A",
        "type": "passive",
        "description": "Anode of the Zener diode, the bottom-left terminal in the top-view device schematic."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "Bottom-right terminal; the device schematic shows no internal connection to the diode."
      },
      {
        "number": "3",
        "name": "K",
        "type": "passive",
        "description": "Cathode of the Zener diode, the single top terminal in the device schematic; for MMBZ5257B the Zener voltage is 33V nominal (31.35V to 34.65V) at IZT = 3.8mA."
      }
    ],
    "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 pin numbers are not printed in the schematic. I assigned them from the standard SOT23 convention; The datasheet covers MMBZ5221B to MMBZ5259B. The MPN has a Q suffix (MMBZ5257BQ-7-F), which the orde",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 7,
        "cost_usd": 0.2868,
        "at": "2026-10-23T03:27:15"
      },
      "datasheet": {
        "url": "https://www.diodes.com/assets/Datasheets/MMBZ5257BQ-7-F.pdf",
        "pages": 7,
        "sha256": "be3510eb4019f5d5",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "mmbz5257bq-7-f.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mmbz5257bq-7-f-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          3,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "57761bac0b21254262086cc7109de0c0d2caf5739cadbf63bb72b9fb2fca6562",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Diodes Incorporated",
      "Package": "SOT-23",
      "Category": "Diodes",
      "Pins": "3"
    },
    "appearance": {
      "contacts": {
        "quote": " Terminal Connections: See Diagram  Terminals: Matte Tin Finish Annealed over Alloy 42 Leadframe",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "be3510eb4019f5d57e86f7f989336ec91d06cb760df8273104fa561df7c3abd5"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "be3510eb4019f5d57e86f7f989336ec91d06cb760df8273104fa561df7c3abd5",
      "rows": [
        {
          "name": "Zener Voltage",
          "symbol": "VZ",
          "kind": "electrical",
          "unit": "V",
          "min": 31.35,
          "typ": 33,
          "max": 34.65,
          "conditions": "IZT = 3.8mA, short duration pulse test",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Test Current",
          "symbol": "IZT",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3.8,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Zener Impedance",
          "symbol": "ZZT",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 58,
          "conditions": "@ IZT, f = 1kHz",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Zener Impedance (knee)",
          "symbol": "ZZK",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 700,
          "conditions": "@ IZK = 0.25mA, f = 1kHz",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Reverse Leakage Current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VR = 25V, short duration pulse test",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Forward Voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.9,
          "conditions": "IF = 10mA, TA = +25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power Dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 350,
          "conditions": "Mounted on FR4 PC board with recommended pad layout",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance, Junction to Ambient Air",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 357,
          "max": null,
          "conditions": "Mounted on FR4 PC board with recommended pad layout",
          "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"
        }
      ]
    }
  },
  "variants": [],
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  "discovery_triggers": [
    "mmbz5257bq-7-f"
  ],
  "discovery_pitch": "MMBZ5257BQ-7-F (Diodes Incorporated) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}