1KSMB39A

{
  "slug": "1ksmb39a",
  "version": "0.1.0",
  "type": "component",
  "description": "Littelfuse Electrostatic And Surge Protection (TVS/ESD), DO-214AA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "tvs-fuse-board level protection",
    "1ksmb39a",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "1ksmb39a.kicad_sym",
    "1ksmb39a.kicad_mod",
    "1ksmb39a.glb",
    "1ksmb39a.step",
    "1ksmb39a.lbr",
    "docs/hero.png",
    "docs/1ksmb39a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "1ksmb39a-hero.glb",
    "1ksmb39a-hero.overlay.json",
    "1ksmb39a-etched.glb"
  ],
  "component": {
    "mpn": "1KSMB39A",
    "manufacturer": "Littelfuse",
    "package": "DO-214AA",
    "pin_count": 2,
    "category": "TVS/Fuse/Board Level Protection",
    "subcategory": "Electrostatic And Surge Protection (TVS/ESD)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/7f813d884aa31d48c8787efb2b7a3ec4.pdf",
    "parts": {
      "symbol": "1ksmb39a.kicad_sym",
      "footprint": "1ksmb39a.kicad_mod",
      "model_3d": "1ksmb39a-hero.glb",
      "model_3d_plain": "1ksmb39a-etched.glb",
      "model_3d_step": "1ksmb39a-etched.step",
      "model_3d_step_plain": "1ksmb39a.step",
      "lbr": "1ksmb39a.lbr"
    },
    "distributor_links": {
      "lcsc": "C3718734",
      "digikey": "18-1KSMB39ATR-ND",
      "mouser": "821-1KSMB39A"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T12:12:41Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "18-1KSMB39ATR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "821-1KSMB39A",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Cathode",
        "type": "passive",
        "description": "Cathode terminal of the unidirectional TVS diode, marked by the color band on the DO-214AA (SMB J-Bend) body; 1KSMB39A has VR 33.3V and VBR 37.1-41.0V at 1mA."
      },
      {
        "number": "2",
        "name": "Anode",
        "type": "passive",
        "description": "Anode terminal of the unidirectional TVS diode, opposite the cathode band; 1KSMB39A has maximum clamping voltage 53.9V at 18.6A Ipp."
      }
    ],
    "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",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet has no numbered pin table for DO-214AA. Pin numbers 1 and 2 are assigned by convention"
        ],
        "pages_sent": 6,
        "cost_usd": 0.068,
        "at": "2026-10-23T12:12:29"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/7f813d884aa31d48c8787efb2b7a3ec4.pdf",
        "pages": 6,
        "sha256": "3a84dff49a0cb8e5",
        "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": "1ksmb39a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.3,
          3.55,
          2.15
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "029466277d91e9f5492556be93e46611049e07115c7913880c547afa96058ed4",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "1ksmb39a-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.3,
          3.55,
          2.15
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "1384dd2d6b081e125d23d0d7f6d30f8acc2d1811f25e679ff65693d9d297ae56",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}