MMBT5551W

{
  "schema_version": 1,
  "type": "component",
  "slug": "mmbt5551w",
  "title": "MMBT5551W",
  "brief": "CBI Bipolar (BJT), SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "transistors-thyristors",
    "mmbt5551w",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "MMBT5551W",
    "manufacturer": "CBI",
    "package": "SOT-323",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Bipolar (BJT)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590903237350944768",
    "parts": {
      "symbol": "mmbt5551w.kicad_sym",
      "footprint": "mmbt5551w.kicad_mod",
      "model_3d": "mmbt5551w-hero.glb",
      "model_3d_plain": "mmbt5551w.glb",
      "model_3d_step": "mmbt5551w-etched.step",
      "model_3d_step_plain": "mmbt5551w.step",
      "lbr": "mmbt5551w.lbr"
    },
    "distributor_links": {
      "lcsc": "C5362106"
    },
    "distributor_check": {
      "checked_at": "2026-10-09T16:42:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BASE",
        "type": "passive",
        "description": "Base terminal of the NPN transistor; the datasheet lists it as pin 1 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VEBO 6 V, IC 600 mA maximum)."
      },
      {
        "number": "2",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the NPN transistor; the datasheet lists it as pin 2 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VEBO 6 V, IC 600 mA maximum)."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal of the NPN transistor; the datasheet lists it as pin 3 of the SOT-323 package and gives no pin-specific limit, so the device ratings apply (VCBO 180 V, VCEO 160 V, IC 600 mA maximum)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin list is the only pinout source. Page 2 (SOT-323 Package Outline Dimensions) contains no pad ; The datasheet text never prints the MPN MMBT5551W. It is an NPN transistor in SOT-323 with marking G; Pin types are KiCad-style assignments chosen by me for a bipolar transistor, since the datasheet doe"
        ],
        "pages_sent": 2,
        "cost_usd": 0.0192,
        "at": "2026-10-09T16:41:34"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590903237350944768",
        "pages": 2,
        "sha256": "ebc846392ebbd555",
        "source_tier": "lcsc"
      },
      "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": "mmbt5551w.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.1,
          2,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "acbf75a28fe41aa90efb38cd2b78220968d6eb6ebae1625dfd532dbeb268fece",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mmbt5551w-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.1,
          2,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "1841fa14a3d88ec69494443535087dfde1edebfbff8e173752840a8465f6083b",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "CBI",
      "Package": "SOT-323",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "mmbt5551w"
  ],
  "discovery_pitch": "MMBT5551W (CBI) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mmbt5551w.kicad_sym",
    "mmbt5551w.kicad_mod",
    "mmbt5551w.glb",
    "mmbt5551w.step",
    "mmbt5551w.lbr",
    "docs/hero.png",
    "docs/mmbt5551w-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mmbt5551w-hero.glb",
    "mmbt5551w-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}