SI8421AB-D-ISR

{
  "slug": "si8421ab-d-isr",
  "version": "0.1.0",
  "type": "component",
  "description": "SILICON LABS Digital Isolators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface ics",
    "si8421ab-d-isr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "si8421ab-d-isr.kicad_sym",
    "si8421ab-d-isr.kicad_mod",
    "si8421ab-d-isr.glb",
    "si8421ab-d-isr.step",
    "si8421ab-d-isr.lbr",
    "docs/hero.png",
    "docs/si8421ab-d-isr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "si8421ab-d-isr-hero.glb",
    "si8421ab-d-isr-hero.overlay.json",
    "si8421ab-d-isr-etched.glb"
  ],
  "component": {
    "mpn": "SI8421AB-D-ISR",
    "manufacturer": "SILICON LABS",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface ICs",
    "subcategory": "Digital Isolators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b3c1a6170848170f31fe817f3fcda1de.pdf",
    "parts": {
      "symbol": "si8421ab-d-isr.kicad_sym",
      "footprint": "si8421ab-d-isr.kicad_mod",
      "model_3d": "si8421ab-d-isr-hero.glb",
      "model_3d_plain": "si8421ab-d-isr-etched.glb",
      "model_3d_step": "si8421ab-d-isr-etched.step",
      "model_3d_step_plain": "si8421ab-d-isr.step",
      "lbr": "si8421ab-d-isr.lbr"
    },
    "distributor_links": {
      "lcsc": "C779275",
      "digikey": "SI8421AB-D-ISR-ND",
      "mouser": "634-SI8421AB-D-ISR"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T01:00:04Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "SI8421AB-D-ISR-ND",
        "status": "found",
        "lifecycle": "Not For New Designs"
      },
      "mouser": {
        "pn": "634-SI8421AB-D-ISR",
        "status": "found",
        "lifecycle": "Not Recommended for New Designs"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD1",
        "type": "power_in",
        "description": "Side 1 power supply, operating range 2.70 V to 5.5 V, with a bypass capacitor of 1 µF or more recommended to GND1."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "bidirectional",
        "description": "Side 1 digital input or output (channel A1)."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "bidirectional",
        "description": "Side 1 digital input or output (channel A2)."
      },
      {
        "number": "4",
        "name": "GND1",
        "type": "power_in",
        "description": "Side 1 ground."
      },
      {
        "number": "5",
        "name": "GND2",
        "type": "power_in",
        "description": "Side 2 ground."
      },
      {
        "number": "6",
        "name": "B2",
        "type": "bidirectional",
        "description": "Side 2 digital input or output (channel B2)."
      },
      {
        "number": "7",
        "name": "B1",
        "type": "bidirectional",
        "description": "Side 2 digital input or output (channel B1)."
      },
      {
        "number": "8",
        "name": "VDD2",
        "type": "power_in",
        "description": "Side 2 power supply, operating range 2.70 V to 5.5 V, with a bypass capacitor of 1 µF or more recommended to GND2."
      }
    ],
    "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",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin table lists A1, A2, B1 and B2 only as 'Digital I/O' and does not state which pins are inputs; The part is marked 'Not Recommended for New Designs'. The ordering table lists Si8421AB-D-IS. The MP"
        ],
        "pages_sent": 15,
        "cost_usd": 0.1208,
        "at": "2026-10-27T00:59:35"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/b3c1a6170848170f31fe817f3fcda1de.pdf",
        "pages": 30,
        "sha256": "630ea949473edada",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "si8421ab-d-isr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "si8421ab-d-isr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3b4cf9bbd31306a0ff857eeee4a88534a705a95fa625de29f53c46478beb39cf",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}