BUL128D-B

{
  "slug": "bul128d-b",
  "version": "0.1.0",
  "type": "component",
  "description": "STMicroelectronics Bipolar (BJT), TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "transistors-thyristors",
    "bul128d-b",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bul128d-b.kicad_sym",
    "bul128d-b.kicad_mod",
    "bul128d-b.glb",
    "bul128d-b.step",
    "bul128d-b.lbr",
    "docs/hero.png",
    "docs/bul128d-b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bul128d-b-hero.glb",
    "bul128d-b-hero.overlay.json"
  ],
  "component": {
    "mpn": "BUL128D-B",
    "manufacturer": "STMicroelectronics",
    "package": "TO-220",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://www.st.com/resource/en/datasheet/bul128d-b.pdf",
    "parts": {
      "symbol": "bul128d-b.kicad_sym",
      "footprint": "bul128d-b.kicad_mod",
      "model_3d": "bul128d-b-hero.glb",
      "model_3d_plain": "bul128d-b.glb",
      "model_3d_step": "bul128d-b-etched.step",
      "model_3d_step_plain": "bul128d-b.step",
      "lbr": "bul128d-b.lbr"
    },
    "distributor_links": {
      "lcsc": 2971460,
      "digikey": "497-12755-5-ND",
      "mouser": "511-BUL128D-B"
    },
    "distributor_check": {
      "checked_at": "2026-10-05T20:30:17Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-12755-5-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "511-BUL128D-B",
        "status": "found",
        "lifecycle": "End of Life"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "B",
        "type": "input",
        "description": "Base of the NPN transistor; absolute maximum base current is 2 A (4 A peak, tp < 5 ms)."
      },
      {
        "number": "2",
        "name": "C",
        "type": "passive",
        "description": "Collector with integrated antiparallel collector-emitter diode; VCES 700 V, VCEO 400 V, IC 4 A (8 A peak, tp < 5 ms)."
      },
      {
        "number": "3",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the NPN transistor; the antiparallel diode is connected between emitter and collector, and V(BR)EBO is 9 V min to 18 V max at IE = 10 mA."
      }
    ],
    "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": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 8,
        "cost_usd": 0.2041,
        "at": "2026-10-05T20:30:04"
      },
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/bul128d-b.pdf",
        "pages": 8,
        "sha256": "0f91b4f2f3241156",
        "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"
    }
  }
}