ISO7721

{
  "schema_version": 1,
  "type": "component",
  "slug": "iso7721",
  "title": "ISO7721",
  "brief": "TI dual-channel digital isolator, SOIC-8. One forward and one reverse channel, 3000 Vrms isolation, up to 100 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": "ISO7721",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "Digital isolator",
    "datasheet": "https://www.ti.com/lit/ds/symlink/iso7721.pdf",
    "parts": {
      "symbol": "iso7721.kicad_sym",
      "footprint": "iso7721.kicad_mod",
      "model_3d": "iso7721-etched.glb",
      "model_3d_plain": "iso7721.glb",
      "model_3d_step": "iso7721-etched.step",
      "model_3d_step_plain": "iso7721.step",
      "lbr": "iso7721.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VCC1",
        "type": "power_in",
        "description": "Side-1 power supply. 2.25 V to 5.5 V. Bypass to GND1 with a low-ESR ceramic capacitor (typ. 100 nF) placed close to the pin."
      },
      {
        "number": "2",
        "name": "OUTA",
        "type": "output",
        "description": "Channel A isolated digital output on side 1 (ISO7721 has channel A flowing from side 2 to side 1). Push-pull CMOS output referenced to VCC1/GND1. Default state is HIGH on power/signal loss (LOW on the F suffix option)."
      },
      {
        "number": "3",
        "name": "INB",
        "type": "input",
        "description": "Channel B digital input on side 1. CMOS/LVCMOS-compatible logic input referenced to VCC1/GND1, driving isolated OUTB on side 2."
      },
      {
        "number": "4",
        "name": "GND1",
        "type": "power_in",
        "description": "Side-1 ground reference for VCC1. Isolated from GND2 by the SiO2 capacitive isolation barrier."
      },
      {
        "number": "5",
        "name": "GND2",
        "type": "power_in",
        "description": "Side-2 ground reference for VCC2. Isolated from GND1 by the SiO2 capacitive isolation barrier."
      },
      {
        "number": "6",
        "name": "OUTB",
        "type": "output",
        "description": "Channel B isolated digital output on side 2. Push-pull CMOS output referenced to VCC2/GND2. Default state is HIGH on power/signal loss (LOW on the F suffix option)."
      },
      {
        "number": "7",
        "name": "INA",
        "type": "input",
        "description": "Channel A digital input on side 2 (ISO7721 has channel A flowing side 2 -> side 1). CMOS/LVCMOS-compatible input referenced to VCC2/GND2, driving isolated OUTA on side 1."
      },
      {
        "number": "8",
        "name": "VCC2",
        "type": "power_in",
        "description": "Side-2 power supply. 2.25 V to 5.5 V, independent of VCC1. Bypass to GND2 with a low-ESR ceramic capacitor (typ. 100 nF) placed close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/iso7721.pdf",
        "pages": 51,
        "sha256": "fb039c00ceb601b9",
        "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": "iso7721.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": "iso7721-etched.step",
        "role": "eda",
        "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": "ce12d2332850393a06e7a43137ad888d64f0bd34c5a6fce4d1490593a9d6791b",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Dual-channel digital isolator (1 forward + 1 reverse)",
      "Isolation": "3000 Vrms (SOIC-8 D)",
      "Data rate": "Up to 100 Mbps",
      "CMTI": "100 kV/us (typ)",
      "Supply (each side)": "2.25-5.5 V",
      "Default output": "High or low (part suffix)",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "iso7721",
    "digital isolator",
    "galvanic isolation ic",
    "signal isolator"
  ],
  "discovery_pitch": "TI ISO7721 dual-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",
    "iso7721.kicad_sym",
    "iso7721.kicad_mod",
    "iso7721.glb",
    "iso7721.step",
    "iso7721.lbr",
    "docs/hero.png",
    "docs/iso7721-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "iso7721-etched.step"
  ],
  "variants": [
    {
      "mpn": "ISO7721DR (SOIC-8, default-high)",
      "kind": "packaging"
    },
    {
      "mpn": "ISO7721QDRQ1 (SOIC-8, automotive)",
      "kind": "packaging"
    },
    {
      "mpn": "ISO7721DWR (SOIC-16W, 5000 Vrms)",
      "kind": "packaging"
    }
  ]
}