π121E31

{
  "slug": "121e31",
  "version": "0.1.0",
  "type": "component",
  "description": "2Pai Semi Digital Isolators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "communication interface chip-uart-485-232",
    "π121e31",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "121e31.kicad_sym",
    "121e31.kicad_mod",
    "121e31.glb",
    "121e31.step",
    "121e31.lbr",
    "docs/hero.png",
    "docs/121e31-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "121e31-hero.glb",
    "121e31-hero.overlay.json",
    "121e31-etched.glb"
  ],
  "component": {
    "mpn": "π121E31",
    "manufacturer": "2Pai Semi",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "Digital Isolators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/0ce5fc54bef52c7f88419fe1dc577c35.pdf",
    "parts": {
      "symbol": "121e31.kicad_sym",
      "footprint": "121e31.kicad_mod",
      "model_3d": "121e31-hero.glb",
      "model_3d_plain": "121e31-etched.glb",
      "model_3d_step": "121e31-etched.step",
      "model_3d_step_plain": "121e31.step",
      "lbr": "121e31.lbr"
    },
    "distributor_links": {
      "lcsc": "C3034750"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T22:53:59Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 870 calls left today"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD1",
        "type": "power_in",
        "description": "Supply voltage for isolator side 1, 3.0 V to 5.5 V operating range, bypass with 0.1 µF to 10 µF to GND1."
      },
      {
        "number": "2",
        "name": "VIA",
        "type": "input",
        "description": "Logic input A on side 1; input must be low when VDD1 is unpowered, and open input gives default output."
      },
      {
        "number": "3",
        "name": "VOB",
        "type": "output",
        "description": "Logic output B on side 2 (VDD2 domain), rated for ±6 mA recommended output current."
      },
      {
        "number": "4",
        "name": "GND1",
        "type": "power_in",
        "description": "Ground 1, the ground reference for isolator side 1."
      },
      {
        "number": "5",
        "name": "GND2",
        "type": "power_in",
        "description": "Ground 2, the ground reference for isolator side 2."
      },
      {
        "number": "6",
        "name": "VIB",
        "type": "input",
        "description": "Logic input B on side 2 (VDD2 domain); input must be low when VDD2 is unpowered."
      },
      {
        "number": "7",
        "name": "VOA",
        "type": "output",
        "description": "Logic output A on side 1 (VDD1 domain), rated for ±6 mA recommended output current."
      },
      {
        "number": "8",
        "name": "VDD2",
        "type": "power_in",
        "description": "Supply voltage for isolator side 2, 3.0 V to 5.5 V operating range, bypass with 0.1 µF to 10 µF 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: Datasheet tables list side-assignment only by names; pin 3 (VOB) and pin 7 (VOA) sides are inferred "
        ],
        "pages_sent": 18,
        "cost_usd": 0.1829,
        "at": "2026-10-22T22:53:44"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/0ce5fc54bef52c7f88419fe1dc577c35.pdf",
        "pages": 18,
        "sha256": "46f1f75769a4de29",
        "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": "121e31.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": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "121e31-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": "659018177c4fd7eb115c0388c7defcbee6e0ed457e2afe3d74cbe550e92195a4",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}