SZ1SMB48AT3G

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  "type": "component",
  "slug": "sz1smb48at3g",
  "title": "SZ1SMB48AT3G",
  "brief": "Littelfuse TVS, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "circuit protection",
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  "component": {
    "mpn": "SZ1SMB48AT3G",
    "manufacturer": "Littelfuse",
    "package": "SMB",
    "pin_count": 2,
    "category": "Circuit Protection",
    "subcategory": "TVS",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/2069ce28d7555e2c42a81caea99fe082.pdf",
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    "distributor_links": {
      "lcsc": "C1975907",
      "digikey": "F11566TR-ND",
      "mouser": "863-SZ1SMB48AT3G"
    },
    "distributor_check": {
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      "source": "Component Ocean /api/assign-pns",
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        "pn": "F11566TR-ND",
        "status": "found",
        "lifecycle": "Active"
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    "pins": [
      {
        "number": "1",
        "name": "Cathode",
        "type": "passive",
        "description": "Cathode of the uni-directional TVS, marked by the color band on the package; the device is rated for a 48 V working peak reverse voltage (VRWM) for the SZ1SMB48AT3G, with a 1.0 mA breakdown test current."
      },
      {
        "number": "2",
        "name": "Anode",
        "type": "passive",
        "description": "Anode of the uni-directional TVS; forward voltage is 3.5 V max at 30 A forward current (Note 5, 1/2 sine wave, 8.3 ms non-repetitive)."
      }
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        "primary_model": "claude-haiku-5-5",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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        ],
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        "cost_usd": 0.0427,
        "at": "2026-10-28T16:41:30"
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      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/2069ce28d7555e2c42a81caea99fe082.pdf",
        "pages": 7,
        "sha256": "b867ff8d1ae59140",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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        "seat": "z = 0",
        "extents_mm": [
          5.3,
          3.55,
          2.15
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "029466277d91e9f5492556be93e46611049e07115c7913880c547afa96058ed4",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Littelfuse",
      "Package": "SMB",
      "Category": "Circuit Protection",
      "Pins": "2"
    },
    "appearance": {
      "contacts": {
        "quote": "and the terminal finish material is tin(Sn) (IPC/",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "b867ff8d1ae591400988029f73b95aec7985d977d15327bd2e7713994199ee73"
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    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
        {
          "name": "Breakdown Voltage (VBR) min",
          "symbol": "VBR",
          "kind": "electrical",
          "unit": "V",
          "min": 53.3,
          "typ": null,
          "max": null,
          "conditions": "IT = 1.0 mA, TA = 25°C (Note 7), uni-directional SZ1SMB48AT3G",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Breakdown Voltage (VBR) max",
          "symbol": "VBR",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 58.9,
          "conditions": "IT = 1.0 mA, TA = 25°C (Note 7), uni-directional SZ1SMB48AT3G",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Breakdown Voltage (VBR) nominal",
          "symbol": "VBR",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 56.1,
          "max": null,
          "conditions": "IT = 1.0 mA, TA = 25°C (Note 7), uni-directional SZ1SMB48AT3G",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Reverse Leakage Current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "@ VRWM = 48 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Clamping Voltage",
          "symbol": "VC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 77.4,
          "max": null,
          "conditions": "@ IPP = 7.7 A (Note 8)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Reverse Peak Pulse Current",
          "symbol": "IPP",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 7.7,
          "max": null,
          "conditions": "Listed with VC for SZ1SMB48AT3G (Note 8)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Working Peak Reverse Voltage",
          "symbol": "VRWM",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 48,
          "max": null,
          "conditions": "Note 6: selected to be equal to or greater than the DC operating voltage",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Breakdown Test Current",
          "symbol": "IT",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "Test current for VBR",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Typical Junction Capacitance",
          "symbol": "C",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 365,
          "max": null,
          "conditions": "Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C (Note 9)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Forward Voltage",
          "symbol": "VF",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 3.5,
          "conditions": "IF = 30 A (Note 5: 1/2 sine wave, PW = 8.3 ms, non-repetitive); uni-directional",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Peak Power Dissipation",
          "symbol": "PPK",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 600,
          "conditions": "TL = 25°C, Pulse Width = 1 ms, 10/1000 µs non-repetitive (Note 1)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC Power Dissipation @ TL = 75°C",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "Measured zero lead length, 1 in² copper pad FR-4 (Note 2)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Derate Above 75°C (lead)",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW/°C",
          "min": null,
          "typ": 40,
          "max": null,
          "conditions": "Derate above TL = 75°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Lead",
          "symbol": "RθJL",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 25,
          "max": null,
          "conditions": "Junction-to-lead",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "DC Power Dissipation @ TA = 25°C",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.55,
          "conditions": "TA = 25°C, FR-4 minimum recommended footprint (Note 3)",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Derate Above 25°C (ambient)",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "mW/°C",
          "min": null,
          "typ": 4.4,
          "max": null,
          "conditions": "Derate above TA = 25°C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 226,
          "max": null,
          "conditions": "Junction-to-ambient, FR-4 minimum recommended footprint",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Forward Surge Current",
          "symbol": "IFSM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "TA = 25°C, 1/2 sine wave, PW = 8.3 ms, 4 pulses per minute max (Note 4), uni-directional only",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating Junction Temperature Range",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "Operating junction temperature",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "Storage temperature",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
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