ISO7221

{
  "schema_version": 1,
  "type": "component",
  "slug": "iso7221",
  "title": "ISO7221",
  "brief": "TI dual-channel digital isolator, SOIC-8. Galvanic isolation, one channel each direction, up to 150 Mbps. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "digital-isolator",
    "galvanic-isolation",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "ISO7221",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface IC",
    "subcategory": "2-channel digital isolator",
    "datasheet": "https://www.ti.com/lit/ds/symlink/iso7221c.pdf",
    "parts": {
      "symbol": "iso7221.kicad_sym",
      "footprint": "iso7221.kicad_mod",
      "model_3d": "iso7221-etched.glb",
      "model_3d_plain": "iso7221.glb",
      "lbr": "iso7221.lbr",
      "model_3d_step": "iso7221-etched.step",
      "model_3d_step_plain": "iso7221.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VCC1",
        "type": "power_in",
        "description": "Power supply for side 1 (input for channel A, output for channel B). 2.8 V / 3.3 V / 5 V; independently referenced to GND1. Decouple locally with a 0.1 µF ceramic near the pin."
      },
      {
        "number": "2",
        "name": "OUTA",
        "type": "output",
        "description": "Buffered CMOS output of channel A on side 1 of the isolation barrier (isolated copy of INA on side 2). 4 mA drive; output high/low tracks VCC1."
      },
      {
        "number": "3",
        "name": "INB",
        "type": "input",
        "description": "Digital input of channel B on side 1. A-, B-, and C-option devices apply a TTL input threshold (VIH ≥ 2 V, VIL ≤ 0.8 V) with input noise filtering; M-option uses a CMOS threshold (0.7·VCC / 0.3·VCC). If undriven for >4 µs the failsafe drives the isolated output high."
      },
      {
        "number": "4",
        "name": "GND1",
        "type": "power_in",
        "description": "Ground reference for side 1 (VCC1 domain). Galvanically isolated from GND2 by the SiO₂ barrier."
      },
      {
        "number": "5",
        "name": "GND2",
        "type": "power_in",
        "description": "Ground reference for side 2 (VCC2 domain). Galvanically isolated from GND1 by the SiO₂ barrier."
      },
      {
        "number": "6",
        "name": "OUTB",
        "type": "output",
        "description": "Buffered CMOS output of channel B on side 2 (isolated copy of INB on side 1). 4 mA drive; output high/low tracks VCC2."
      },
      {
        "number": "7",
        "name": "INA",
        "type": "input",
        "description": "Digital input of channel A on side 2. A-, B-, and C-option devices use TTL thresholds with input noise filtering; M-option uses CMOS thresholds. Failsafe forces the isolated output high when INA is undriven for >4 µs."
      },
      {
        "number": "8",
        "name": "VCC2",
        "type": "power_in",
        "description": "Power supply for side 2 (input for channel A, output for channel B). 2.8 V / 3.3 V / 5 V; independently referenced to GND2. Decouple locally with a 0.1 µF ceramic near the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/iso7221c.pdf",
        "pages": 39,
        "sha256": "b74a541cca2d68e0",
        "source_tier": "mfr"
      },
      "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": "iso7221.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "iso7221-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d7225d86ee584af9032fa615840d1df3edf3fea9b63fe3a2cd84dad52cc95931",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "2-channel digital isolator",
      "Channels": "2 (one each direction)",
      "Isolation": "~2.5 kVrms barrier (capacitive)",
      "Data rate": "up to 150 Mbps (by grade)",
      "Supplies": "VCC1 + VCC2 (independent)",
      "Advantage": "faster + longer-life than optocoupler",
      "Supply voltage": "3.3-5 V each side",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "iso7221",
    "digital isolator",
    "galvanic isolation",
    "signal isolator",
    "opto replacement"
  ],
  "discovery_pitch": "ISO7221 2-channel digital isolator (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "iso7221.kicad_sym",
    "iso7221.kicad_mod",
    "iso7221.glb",
    "iso7221.lbr",
    "docs/hero.png",
    "docs/iso7221-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "iso7221-etched.step"
  ],
  "variants": [
    {
      "mpn": "ISO7221CD (SOIC-8)",
      "kind": "packaging"
    },
    {
      "mpn": "ISO7221AD (SOIC-8)",
      "kind": "packaging"
    }
  ]
}