BAS21A

{
  "slug": "bas21a",
  "version": "0.1.0",
  "type": "component",
  "description": "Changjing Switching Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "diodes",
    "bas21a",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bas21a.kicad_sym",
    "bas21a.kicad_mod",
    "bas21a.glb",
    "bas21a.step",
    "bas21a.lbr",
    "docs/hero.png",
    "docs/bas21a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bas21a-hero.glb",
    "bas21a-hero.overlay.json",
    "bas21a-etched.glb"
  ],
  "component": {
    "mpn": "BAS21A",
    "manufacturer": "Changjing",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Diodes",
    "subcategory": "Switching Diodes",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586179733029859328",
    "parts": {
      "symbol": "bas21a.kicad_sym",
      "footprint": "bas21a.kicad_mod",
      "model_3d": "bas21a-hero.glb",
      "model_3d_plain": "bas21a-etched.glb",
      "model_3d_step": "bas21a-etched.step",
      "model_3d_step_plain": "bas21a.step",
      "lbr": "bas21a.lbr"
    },
    "distributor_links": {
      "lcsc": "C68964"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T14:31:43Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "K1",
        "type": "passive",
        "description": "Cathode of the first diode of the BAS21A dual common-anode switching diode (VRRM 250 V, IFM 400 mA per the datasheet ratings)."
      },
      {
        "number": "2",
        "name": "K2",
        "type": "passive",
        "description": "Cathode of the second diode of the BAS21A dual common-anode switching diode (VRRM 250 V, IFM 400 mA per the datasheet ratings)."
      },
      {
        "number": "3",
        "name": "A",
        "type": "passive",
        "description": "Common anode of both diodes in the BAS21A (marking JS2), shared connection of the two diodes."
      }
    ],
    "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": [
          "extractor flagged: Pin numbers 1, 2, 3 and the BAS21A two-diode, common-node-at-pin-3 topology are read from the page 1",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 4,
        "cost_usd": 0.1745,
        "at": "2026-10-17T14:29:42"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586179733029859328",
        "pages": 4,
        "sha256": "15a308ba5c95c43a",
        "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": "bas21a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bas21a-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "513a7f074566ed9405bb1080ebf10114b51c968a7114b589ea518d451180e284",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}