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Ray Set visibility: public 97b7889 9h ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "sml4738a-e3",
  "title": "SML4738A-E3",
  "brief": "Vishay Intertech Zener Diodes, DO-214AC(SMA). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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    "category": "Diodes",
    "subcategory": "Zener Diodes",
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      "lbr": "sml4738a-e3.lbr"
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    "distributor_links": {
      "lcsc": "C3732033"
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    "distributor_check": {
      "checked_at": "2026-10-22T21:14:29Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
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        "status": "quota"
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      "mouser": {
        "pn": null,
        "status": "quota"
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    "pins": [
      {
        "number": "1",
        "name": "K",
        "type": "passive",
        "description": "Cathode (marked with the cathode band) of the Zener diode; SML4738A has a nominal VZ of 8.2 V at IZT 31 mA with ±5 % tolerance."
      },
      {
        "number": "2",
        "name": "A",
        "type": "passive",
        "description": "Anode of the Zener diode, the terminal opposite the cathode band on the DO-214AC (SMA) package."
      }
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
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        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet shows only a cathode band on the package drawing and does not print pin numbers or nam; The ordering table lists only SML4728-E3/5A and /61 style codes. The MPN SML4738A-E3 follows the bas"
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        "cost_usd": 0.0582,
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        "pages": 5,
        "sha256": "15b3fea9a6e65941",
        "source_tier": "mfr"
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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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        "role": "plain",
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "1cfddd4e3b1bf22b8fc6ee3258c2aade882ed7b85b528e23b9db42437775a1db",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sml4738a-e3-etched.step",
        "role": "eda",
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        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  "metadata": {
    "specs": {
      "Manufacturer": "Vishay Intertech",
      "Package": "DO-214AC(SMA)",
      "Category": "Diodes",
      "Pins": "2"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "15b3fea9a6e65941a5eaba6afa3a1ff837b4828e8605af1d6cd45a82711a4b53",
      "rows": [
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          "name": "Zener voltage tolerance (suffix A)",
          "symbol": "VZ",
          "kind": "tolerance",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "suffix A",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Reverse current",
          "symbol": "IR",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "at VR = 6 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance",
          "symbol": "ZZ",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 4.5,
          "conditions": "at IZT1",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance (knee)",
          "symbol": "ZZK",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 700,
          "conditions": "at IZT2",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Surge current",
          "symbol": "IRM",
          "kind": "electrical",
          "unit": "mApk",
          "min": null,
          "typ": null,
          "max": 550,
          "conditions": "8.3 ms pulse width square wave or equivalent sine-wave superimposed on IZT",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "Ptot",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 1000,
          "conditions": "TL = 75 °C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
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          "conditions": "",
          "source_page": 1,
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        },
        {
          "name": "Storage temperature range",
          "symbol": "Tstg",
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          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 1,
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        },
        {
          "name": "Nominal Zener voltage",
          "symbol": "VZ",
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          "unit": "V",
          "min": null,
          "typ": 8.2,
          "max": null,
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        {
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        {
          "name": "Test current 2",
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          "kind": "electrical",
          "unit": "mA",
          "min": null,
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          "max": null,
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          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_triggers": [
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  "discovery_pitch": "SML4738A-E3 (Vishay Intertech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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