CA-IS3721HW

{
  "schema_version": 1,
  "type": "component",
  "slug": "ca-is3721hw",
  "title": "CA-IS3721HW",
  "brief": "Chipanalog Digital Isolators, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "signal isolation devices",
    "ca-is3721hw",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CA-IS3721HW",
    "manufacturer": "Chipanalog",
    "package": "SOIC-16-300mil",
    "pin_count": 16,
    "category": "Signal Isolation Devices",
    "subcategory": "Digital Isolators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603114279264935936",
    "parts": {
      "symbol": "ca-is3721hw.kicad_sym",
      "footprint": "ca-is3721hw.kicad_mod",
      "model_3d": "ca-is3721hw-hero.glb",
      "model_3d_plain": "ca-is3721hw-etched.glb",
      "model_3d_step": "ca-is3721hw-etched.step",
      "model_3d_step_plain": "ca-is3721hw.step",
      "lbr": "ca-is3721hw.lbr"
    },
    "distributor_links": {
      "lcsc": "C5337993"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T01:49:58Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GNDA",
        "type": "power_in",
        "description": "A-side ground reference point for the isolator's input side; GNDA is tied internally to pin 7."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; the pin may be left floating or connected to VDD or GND."
      },
      {
        "number": "3",
        "name": "VDDA",
        "type": "power_in",
        "description": "A-side supply voltage; recommended operating range is 2.375 V to 5.5 V (typical 3.3 V), with 0.1 µF to 1 µF bypass capacitance required."
      },
      {
        "number": "4",
        "name": "VI1",
        "type": "input",
        "description": "A-side logic input for channel 1 of CA-IS3721, TTL-compatible with Schmitt-trigger input (VIH 2.0 V min, VIL 0.8 V max)."
      },
      {
        "number": "5",
        "name": "VO2",
        "type": "output",
        "description": "A-side logic output for channel 2 of CA-IS3721 (reverse channel); it drives the output as the RX side and defaults high on loss of input power or signal for the H-suffix device."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; the pin may be left floating or connected to VDD or GND."
      },
      {
        "number": "7",
        "name": "GNDA",
        "type": "power_in",
        "description": "A-side ground reference point for the isolator's input side; GNDA is tied internally to pin 1."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; the pin may be left floating or connected to VDD or GND."
      },
      {
        "number": "9",
        "name": "GNDB",
        "type": "power_in",
        "description": "B-side ground reference point for the isolated output side; GNDB is tied internally to pin 16."
      },
      {
        "number": "10",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; the pin may be left floating or connected to VDD or GND."
      },
      {
        "number": "11",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; the pin may be left floating or connected to VDD or GND."
      },
      {
        "number": "12",
        "name": "VI2",
        "type": "input",
        "description": "B-side logic input for channel 2 of CA-IS3721, TTL-compatible with Schmitt-trigger input (VIH 2.0 V min, VIL 0.8 V max)."
      },
      {
        "number": "13",
        "name": "VO1",
        "type": "output",
        "description": "B-side logic output for channel 1 of CA-IS3721; it follows the A-side input and defaults high on loss of input power or signal for the H-suffix device."
      },
      {
        "number": "14",
        "name": "VDDB",
        "type": "power_in",
        "description": "B-side supply voltage; recommended operating range is 2.375 V to 5.5 V (typical 3.3 V), with 0.1 µF to 1 µF bypass capacitance required."
      },
      {
        "number": "15",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; the pin may be left floating or connected to VDD or GND."
      },
      {
        "number": "16",
        "name": "GNDB",
        "type": "power_in",
        "description": "B-side ground reference point for the isolated output side; GNDB is tied internally to pin 9."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Table 6-1 gives a combined pinout for all CA-IS371x/2x SOIC16-WB variants. Pin functions were mapped; Pin 5 is labelled 'VI2/VO2/NC1' in the datasheet, and the NC note applies only to CA-IS3710. For CA-; The datasheet is in Chinese. Pin descriptions are translated into English; the logic thresholds (VIH"
        ],
        "pages_sent": 25,
        "cost_usd": 0.1236,
        "at": "2026-10-19T01:47:23"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603114279264935936",
        "pages": 25,
        "sha256": "e0570f476c6a89dd",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ca-is3721hw.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ca-is3721hw-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": "457fdc821c4780f736cb34753cf981e84805801e3d5342f8f5f6c3f0e27cd716",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Chipanalog",
      "Package": "SOIC-16-300mil",
      "Category": "Signal Isolation Devices",
      "Pins": "16"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "e0570f476c6a89dd066427feaa2feb157c942b1a73c2f74405c89c366f0f8d16",
      "rows": [
        {
          "name": "Supply voltage (absolute maximum)",
          "symbol": "VDDA, VDDB",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input voltage (absolute maximum)",
          "symbol": "Vin",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": null,
          "conditions": "Ax, Bx, ENx; max = VDDA+0.5 (footnote 3: not to exceed 6 V)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Output current (absolute maximum)",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -20,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature (absolute maximum)",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage (recommended)",
          "symbol": "VDDA, VDDB",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.375,
          "typ": 3.3,
          "max": 5.5,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "UVLO threshold, supply rising",
          "symbol": "VDD(UVLO+)",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.95,
          "typ": 2.24,
          "max": 2.375,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "UVLO threshold, supply falling",
          "symbol": "VDD(UVLO-)",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.88,
          "typ": 2.1,
          "max": 2.325,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "UVLO hysteresis",
          "symbol": "VHYS(UVLO)",
          "kind": "recommended_operating",
          "unit": "mV",
          "min": 70,
          "typ": 140,
          "max": 250,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "High-level output current",
          "symbol": "IOH",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": -4,
          "typ": null,
          "max": null,
          "conditions": "VDDO = 5V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "High-level output current",
          "symbol": "IOH",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": -2,
          "typ": null,
          "max": null,
          "conditions": "VDDO = 3.3V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "High-level output current",
          "symbol": "IOH",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": -1,
          "typ": null,
          "max": null,
          "conditions": "VDDO = 2.5V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Low-level output current",
          "symbol": "IOL",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "VDDO = 5V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Low-level output current",
          "symbol": "IOL",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "VDDO = 3.3V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Low-level output current",
          "symbol": "IOL",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "VDDO = 2.5V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input threshold logic high",
          "symbol": "VIH",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input threshold logic low",
          "symbol": "VIL",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Signal data rate",
          "symbol": "DR",
          "kind": "recommended_operating",
          "unit": "Mbps",
          "min": 0,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Ambient temperature",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": 27,
          "max": 125,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Positive input threshold",
          "symbol": "VIT+(IN)",
          "kind": "electrical",
          "unit": "V",
          "min": 1.4,
          "typ": 1.67,
          "max": 1.9,
          "conditions": "VDDA = VDDB = 5 V ± 10%",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Negative input threshold",
          "symbol": "VIT-(IN)",
          "kind": "electrical",
          "unit": "V",
          "min": 1,
          "typ": 1.23,
          "max": 1.4,
          "conditions": "VDDA = VDDB = 5 V ± 10%",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Input threshold hysteresis",
          "symbol": "VI(HYS)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.3,
          "typ": 0.44,
          "max": 0.5,
          "conditions": "VDDA = VDDB = 5 V ± 10%",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Logic low output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": 0.4,
          "conditions": "IOL = 4mA; 图 8-1",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Input high leakage current",
          "symbol": "IIH",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "VIH = VDDA at Ax or Bx or ENx",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Input low leakage current",
          "symbol": "IIL",
          "kind": "electrical",
          "unit": "µA",
          "min": -4,
          "typ": null,
          "max": null,
          "conditions": "VIL = 0 V at Ax or Bx",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Output impedance tolerance",
          "symbol": "ZO",
          "kind": "tolerance",
          "unit": "%",
          "min": -40,
          "typ": null,
          "max": 40,
          "conditions": "Note 2: normal isolator channel, approx. 50Ω ±40%",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Common-mode transient immunity",
          "symbol": "CMTI",
          "kind": "electrical",
          "unit": "kV/µS",
          "min": 75,
          "typ": 100,
          "max": null,
          "conditions": "VI = VDDI1 or 0 V, VCM = 1200 V; 图 8-3",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Minimum pulse width",
          "symbol": "PWmin",
          "kind": "timing",
          "unit": "ns",
          "min": 5,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Propagation delay",
          "symbol": "tPLH, tPHL",
          "kind": "timing",
          "unit": "ns",
          "min": 5,
          "typ": 8,
          "max": 13,
          "conditions": "图 8-1",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Pulse width distortion",
          "symbol": "PWD",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 0.2,
          "max": 4.5,
          "conditions": "|tPLH - tPHL|",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Channel-to-channel output skew",
          "symbol": "tsk(o)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 0.4,
          "max": 2.5,
          "conditions": "same-direction channels (note 1)",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Part-to-part skew",
          "symbol": "tsk(pp)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 2,
          "max": 4.5,
          "conditions": "",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Output rise time",
          "symbol": "tr",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 2.5,
          "max": 4,
          "conditions": "图 8-1",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Output fall time",
          "symbol": "tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 2.5,
          "max": 4,
          "conditions": "图 8-1",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Default output delay from input power loss",
          "symbol": "tDO",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 8,
          "max": 12,
          "conditions": "图 8-2",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Start-up time",
          "symbol": "tSU",
          "kind": "timing",
          "unit": "µs",
          "min": null,
          "typ": 15,
          "max": 40,
          "conditions": "",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Supply current side A, DC",
          "symbol": "IDDA",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.3,
          "max": 2,
          "conditions": "DC signal; VIN = VDDI (CA-IS3721H)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side B, DC",
          "symbol": "IDDB",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.3,
          "max": 2,
          "conditions": "DC signal; VIN = VDDI (CA-IS3721H)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side A, 1Mbps",
          "symbol": "IDDA",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.8,
          "max": 2.6,
          "conditions": "All channel inputs 50% duty 5V square wave; CL = 15 pF; 1Mbps (500kHz)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side B, 1Mbps",
          "symbol": "IDDB",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.8,
          "max": 2.6,
          "conditions": "All channel inputs 50% duty 5V square wave; CL = 15 pF; 1Mbps (500kHz)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side A, 10Mbps",
          "symbol": "IDDA",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 2.2,
          "max": 3.3,
          "conditions": "All channel inputs 50% duty 5V square wave; CL = 15 pF; 10Mbps (5MHz)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side B, 10Mbps",
          "symbol": "IDDB",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 2.2,
          "max": 3.3,
          "conditions": "All channel inputs 50% duty 5V square wave; CL = 15 pF; 10Mbps (5MHz)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side A, 100Mbps",
          "symbol": "IDDA",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 7,
          "max": 10.5,
          "conditions": "All channel inputs 50% duty 5V square wave; CL = 15 pF; 100Mbps (50MHz)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Supply current side B, 100Mbps",
          "symbol": "IDDB",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 7,
          "max": 10.5,
          "conditions": "All channel inputs 50% duty 5V square wave; CL = 15 pF; 100Mbps (50MHz)",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Logic high output voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 4.8,
          "max": null,
          "conditions": "IOH = -4mA; 图 8-1",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Output impedance",
          "symbol": "ZO",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 50,
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