main
Ray Set visibility: public 54cb739 7d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "szmmbz20valt1g",
  "title": "SZMMBZ20VALT1G",
  "brief": "onsemi ESD And Surge Protection (TVS/ESD), 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": [
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    "szmmbz20valt1g",
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    "extractor-text"
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  "component": {
    "mpn": "SZMMBZ20VALT1G",
    "manufacturer": "onsemi",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Circuit Protection",
    "subcategory": "ESD And Surge Protection (TVS/ESD)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603034568358715392",
    "parts": {
      "symbol": "szmmbz20valt1g.kicad_sym",
      "footprint": "szmmbz20valt1g.kicad_mod",
      "model_3d": "szmmbz20valt1g-hero.glb",
      "model_3d_plain": "szmmbz20valt1g-etched.glb",
      "model_3d_step": "szmmbz20valt1g-etched.step",
      "model_3d_step_plain": "szmmbz20valt1g.step",
      "lbr": "szmmbz20valt1g.lbr"
    },
    "distributor_links": {
      "lcsc": "C463902"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T16:16:40Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CATHODE 1",
        "type": "passive",
        "description": "Cathode of the first of the two monolithic Zener junctions; it is used with pin 3 for one unidirectional protected line (circuit tied to pins 1 and 3)."
      },
      {
        "number": "2",
        "name": "CATHODE 2",
        "type": "passive",
        "description": "Cathode of the second Zener junction; it is used with pin 3 for the second unidirectional protected line (circuit tied to pins 2 and 3)."
      },
      {
        "number": "3",
        "name": "ANODE",
        "type": "passive",
        "description": "Common anode shared by both Zener junctions, serving as the return for the two protected lines in the unidirectional configuration."
      }
    ],
    "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 pinout is the generic SOT-23 Style 12 assignment (1 Cathode, 2 Cathode, 3 Anode) from the case o; The 20 V part is listed as MMBZ20VALT1G in the 40 W electrical table (page 3). The SZ-prefixed varia; The datasheet does not state which pin pair is used for the single bidirectional configuration, so n"
        ],
        "pages_sent": 8,
        "cost_usd": 0.0474,
        "at": "2026-10-18T16:16:26"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603034568358715392",
        "pages": 8,
        "sha256": "5cb1c4fad5e02c73",
        "source_tier": "lcsc"
      },
      "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": [
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        "file": "szmmbz20valt1g.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": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "szmmbz20valt1g-etched.step",
        "role": "eda",
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        "sha256": "588fa0dcdf4b7816643746e6e881f289b216c248dba836885e4ea76de1e94418",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "SOT-23",
      "Category": "Circuit Protection",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "5cb1c4fad5e02c7390d0bb3707d45384860cffc72e6e60ce3f30406b57e18ff8",
      "rows": [
        {
          "name": "Peak Power Dissipation @ 1.0 ms",
          "symbol": "Ppk",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "@ TL ≤ 25°C, 1.0 ms (Note 1); 40 W group MMBZ12VALT1G thru MMBZ47VALT1G",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Total Power Dissipation on FR-5 Board",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 225,
          "conditions": "@ TA = 25°C (Note 2)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Total Power Dissipation on Alumina Substrate",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "@ TA = 25°C (Note 3)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Junction and Storage Temperature Range",
          "symbol": "TJ, Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Lead Solder Temperature - Maximum",
          "symbol": "TL",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "10 second duration",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Ambient (FR-5 Board)",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 556,
          "max": null,
          "conditions": "FR-5 board (Note 2)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Ambient (Alumina Substrate)",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 417,
          "max": null,
          "conditions": "Alumina substrate (Note 3)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power Derating above 25°C (FR-5 Board)",
          "symbol": "",
          "kind": "thermal",
          "unit": "mW/°C",
          "min": null,
          "typ": 1.8,
          "max": null,
          "conditions": "derate above TA = 25°C, FR-5 board",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power Derating above 25°C (Alumina Substrate)",
          "symbol": "",
          "kind": "thermal",
          "unit": "mW/°C",
          "min": null,
          "typ": 2.4,
          "max": null,
          "conditions": "derate above TA = 25°C, alumina substrate",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Breakdown Voltage (5% tolerance, 40 W group)",
          "symbol": "VBR",
          "kind": "electrical",
          "unit": "V",
          "min": 19,
          "typ": 20,
          "max": 21,
          "conditions": "@ IT = 1.0 mA, TA = 25°C (Note 4)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Reverse Leakage Current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "@ VRWM = 17 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Clamping Voltage @ IPP",
          "symbol": "VC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 28,
          "conditions": "@ IPP = 1.4 A; surge per Figure 6, derate per Figure 7 (Note 6)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Reverse Peak Pulse Current",
          "symbol": "IPP",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 1.4,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Temperature Coefficient of VBR",
          "symbol": "VBR",
          "kind": "temperature_coefficient",
          "unit": "mV/°C",
          "min": null,
          "typ": null,
          "max": 17.2,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Forward Voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.9,
          "conditions": "@ IF = 10 mA",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "readme",
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  "discovery_triggers": [
    "szmmbz20valt1g"
  ],
  "discovery_pitch": "SZMMBZ20VALT1G (onsemi) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "visibility": {
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}