MMSTA42

{
  "slug": "mmsta42",
  "version": "0.1.0",
  "type": "component",
  "description": "Changjing Bipolar Transistors - BJT, SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "triode-mos tube-transistor",
    "mmsta42",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mmsta42.kicad_sym",
    "mmsta42.kicad_mod",
    "mmsta42.glb",
    "mmsta42.step",
    "mmsta42.lbr",
    "docs/hero.png",
    "docs/mmsta42-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mmsta42-hero.glb",
    "mmsta42-hero.overlay.json",
    "mmsta42-etched.glb"
  ],
  "component": {
    "mpn": "MMSTA42",
    "manufacturer": "Changjing",
    "package": "SOT-323",
    "pin_count": 3,
    "category": "Triode/MOS Tube/Transistor",
    "subcategory": "Bipolar Transistors - BJT",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/9345bbc0718907ce5f31c2bbce1ae50c.pdf",
    "parts": {
      "symbol": "mmsta42.kicad_sym",
      "footprint": "mmsta42.kicad_mod",
      "model_3d": "mmsta42-hero.glb",
      "model_3d_plain": "mmsta42-etched.glb",
      "model_3d_step": "mmsta42-etched.step",
      "model_3d_step_plain": "mmsta42.step",
      "lbr": "mmsta42.lbr"
    },
    "distributor_links": {
      "lcsc": "C968405"
    },
    "distributor_check": {
      "checked_at": "2026-11-04T18:18:57Z",
      "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 limits the emitter-base voltage to VEBO 5 V and the emitter-base breakdown to V(BR)EBO 5 V."
      },
      {
        "number": "2",
        "name": "EMITTER",
        "type": "passive",
        "description": "Emitter terminal of the NPN transistor; the datasheet limits the emitter-base voltage to VEBO 5 V maximum."
      },
      {
        "number": "3",
        "name": "COLLECTOR",
        "type": "passive",
        "description": "Collector terminal of the NPN transistor; the datasheet rates VCBO 300 V, VCEO 300 V, IC 0.2 A continuous and ICM 0.5 A pulsed."
      }
    ],
    "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": [],
        "pages_sent": 4,
        "cost_usd": 0.0156,
        "at": "2026-11-04T18:18:50"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/9345bbc0718907ce5f31c2bbce1ae50c.pdf",
        "pages": 4,
        "sha256": "001b875a333175a5",
        "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": "mmsta42.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.1,
          2.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "acbf75a28fe41aa90efb38cd2b78220968d6eb6ebae1625dfd532dbeb268fece",
        "checked": "2026-11-04",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mmsta42-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.1,
          2.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "99e55fbe4eccc1a11d92639eaaac6770442876dd8ddc0699742851a8967fb911",
        "checked": "2026-11-04",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "SOT-323",
      "source_page": 3,
      "D": {
        "nom_mm": 2.1,
        "range_mm": [
          2.0,
          2.2
        ]
      },
      "E1": {
        "nom_mm": 1.25,
        "range_mm": [
          1.15,
          1.35
        ]
      },
      "E": {
        "nom_mm": 2.3,
        "range_mm": [
          2.15,
          2.45
        ]
      },
      "e": {
        "nom_mm": 0.65,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.0,
        "range_mm": [
          0.9,
          1.1
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "mmsta42.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}