BST52

{
  "schema_version": 1,
  "type": "component",
  "slug": "bst52",
  "title": "BST52",
  "brief": "Nexperia Darlington Transistors, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "transistors-thyristors",
    "bst52"
  ],
  "component": {
    "mpn": "BST52",
    "manufacturer": "Nexperia",
    "package": "SOT-89-3",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Darlington Transistors",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/BST52.pdf",
    "parts": {
      "symbol": "bst52.kicad_sym",
      "footprint": "bst52.kicad_mod",
      "model_3d": "bst52-etched.glb",
      "model_3d_plain": "bst52.glb",
      "model_3d_step": "bst52-etched.step",
      "model_3d_step_plain": "bst52.step",
      "lbr": "bst52.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "E",
        "type": "passive",
        "description": "Emitter of the NPN Darlington pair. Common return path for collector current; VEBO limited to 5 V (open collector)."
      },
      {
        "number": "2",
        "name": "C",
        "type": "passive",
        "description": "Collector of the NPN Darlington pair. Main current-handling terminal; VCEO up to 80 V, IC up to 1 A (peak 2 A). Also connected to the SOT89 heat-spreading tab for improved thermal dissipation."
      },
      {
        "number": "3",
        "name": "B",
        "type": "passive",
        "description": "Base control input of the NPN Darlington pair. Drives the compound transistor through an integrated base-emitter resistor with an anti-parallel diode; IB limited to 100 mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/BST52.pdf",
        "pages": 8,
        "sha256": "8ca616767aa12634",
        "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"
    },
    "models_3d": [
      {
        "file": "bst52.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.5,
          1.52
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "844c0bb504d0c383535d9845c6376fe7a4053241a2ede8d8ef694df3fcfc37c8",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bst52-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.5,
          1.52
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "44a6d9785da646bb620866c12c34eb351a3bf15d21ac9a815c8bf45f2a3f78e7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "SOT-89-3",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bst52"
  ],
  "discovery_pitch": "BST52 (Nexperia) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bst52.kicad_sym",
    "bst52.kicad_mod",
    "bst52.glb",
    "bst52.step",
    "bst52.lbr",
    "docs/hero.png",
    "docs/bst52-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T18:12:49.113Z"
}