π122U31

{
  "schema_version": 1,
  "type": "component",
  "slug": "122u31",
  "title": "π122U31",
  "brief": "2Pai Semi Digital Isolators, SOIC-8. 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",
    "interface ics",
    "π122u31",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "π122U31",
    "manufacturer": "2Pai Semi",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface ICs",
    "subcategory": "Digital Isolators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/860564073644f05b18d12ab56d5e37d7.pdf",
    "parts": {
      "symbol": "122u31.kicad_sym",
      "footprint": "122u31.kicad_mod",
      "model_3d": "122u31-hero.glb",
      "model_3d_plain": "122u31-etched.glb",
      "model_3d_step": "122u31-etched.step",
      "model_3d_step_plain": "122u31.step",
      "lbr": "122u31.lbr"
    },
    "distributor_links": {
      "lcsc": "C471590"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T04:42:52Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "error"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD1",
        "type": "power_in",
        "description": "Supply voltage for isolator side 1, which the datasheet specifies as 3 V to 5.5 V (VDDx)."
      },
      {
        "number": "2",
        "name": "VOA",
        "type": "output",
        "description": "Logic output A, with the output high level bounded by VDDx and the default output state set by the part's fail-safe option (High for π122U31)."
      },
      {
        "number": "3",
        "name": "VIB",
        "type": "input",
        "description": "Logic input B, with high-level input thresholds of 0.7*VDDx to VDDx and low-level input thresholds of 0 to 0.3*VDDx."
      },
      {
        "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": "VOB",
        "type": "output",
        "description": "Logic output B, with the output high level bounded by VDDx and the default output state set by the part's fail-safe option."
      },
      {
        "number": "7",
        "name": "VIA",
        "type": "input",
        "description": "Logic input A, with high-level input thresholds of 0.7*VDDx to VDDx and low-level input thresholds of 0 to 0.3*VDDx."
      },
      {
        "number": "8",
        "name": "VDD2",
        "type": "power_in",
        "description": "Supply voltage for isolator side 2, which the datasheet specifies as 3 V to 5.5 V (VDDx)."
      }
    ],
    "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: The ordering guide lists π122U31 as a 1-input VDD1 side / 1-input VDD2 side part with 3 kV rms isola; Pin descriptions for VOA, VOB, VIA and VIB are taken from the Table 2 and the pin function table. Th"
        ],
        "pages_sent": 15,
        "cost_usd": 0.0788,
        "at": "2026-10-21T04:37:13"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/860564073644f05b18d12ab56d5e37d7.pdf",
        "pages": 15,
        "sha256": "9446a9f1f049ff4b",
        "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": "122u31.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": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "122u31-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": "2d4edeea1c4bc63d312cfe6068a7312d293f4d0cb432fb666741b2ff21007528",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "2Pai Semi",
      "Package": "SOIC-8",
      "Category": "Interface ICs",
      "Pins": "8"
    },
    "appearance": {
      "housing": {
        "quote": "In accordance with DIN V VDE V 0884-10, each π120U3x/π121U3x/π122U3x is proof tested by applying an insulation test voltage ≥ 1326 V peak for 1 sec (partial discharge detection limit = 5 pC); each π12",
        "page": 8,
        "doc": "ds.pdf",
        "material": "pC"
      },
      "version": 1,
      "datasheet_sha256": "9446a9f1f049ff4b8848bbaa1e07eafa49f4281d90e1acbb24e0843f8528c6f0"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "9446a9f1f049ff4b8848bbaa1e07eafa49f4281d90e1acbb24e0843f8528c6f0",
      "rows": [
        {
          "name": "Supply Voltages (VDD1-GND1, VDD2-GND2)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Average Output Current per Pin, Side 1",
          "symbol": "IO1",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -10,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Average Output Current per Pin, Side 2",
          "symbol": "IO2",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -10,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Common-Mode Transients Immunity",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "kV/µs",
          "min": -150,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "TST",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Ambient Operating Temperature Range",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage",
          "symbol": "VDDx",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Signal Voltage",
          "symbol": "VIL",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Current",
          "symbol": "IOH",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": -6,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Current",
          "symbol": "IOL",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum Data Rate",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "Kbps",
          "min": 0,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Ambient Operating Temperature",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Minimum Pulse Width",
          "symbol": "PW",
          "kind": "timing",
          "unit": "us",
          "min": 6.5,
          "typ": null,
          "max": null,
          "conditions": "Within pulse width distortion (PWD) limit",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Maximum Data Rate",
          "symbol": "",
          "kind": "timing",
          "unit": "Kbps",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "Within PWD limit",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay Time",
          "symbol": "tpHL, tpLH",
          "kind": "timing",
          "unit": "us",
          "min": 3,
          "typ": null,
          "max": 4.5,
          "conditions": "50% input to 50% output, 50% @ 5VDC supply",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay Time",
          "symbol": "tpHL, tpLH",
          "kind": "timing",
          "unit": "us",
          "min": 3.2,
          "typ": null,
          "max": 4.8,
          "conditions": "50% input to 50% output, @ 3.3VDC supply",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Pulse Width Distortion",
          "symbol": "PWD",
          "kind": "timing",
          "unit": "us",
          "min": 0,
          "typ": 0.02,
          "max": 0.2,
          "conditions": "|tpHL - tpLH|, @ 5VDC supply",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Part to Part Propagation Delay Skew",
          "symbol": "tPSK",
          "kind": "timing",
          "unit": "us",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "Max difference between any two devices, @ 5VDC supply",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Channel to Channel Propagation Delay Skew",
          "symbol": "tCSK",
          "kind": "timing",
          "unit": "us",
          "min": 0,
          "typ": null,
          "max": 0.2,
          "conditions": "@ 5VDC supply",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Signal Rise/Fall Time",
          "symbol": "tr/tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 1.5,
          "conditions": "10% to 90% signal, terminated 50 Ω",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Common-Mode Transient Immunity",
          "symbol": "CMTI",
          "kind": "electrical",
          "unit": "kV/µs",
          "min": 100,
          "typ": 150,
          "max": null,
          "conditions": "VIN = VDDx2 or 0V, VCM = 1000 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ESD (HBM - Human Body Model)",
          "symbol": "ESD",
          "kind": "electrical",
          "unit": "kV",
          "min": -8,
          "typ": null,
          "max": 8,
          "conditions": "All pins",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 0.1,
          "conditions": "20 µA output current",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": 0.1,
          "typ": null,
          "max": 0.2,
          "conditions": "2 mA output current",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input Current per Signal Channel",
          "symbol": "IIN",
          "kind": "electrical",
          "unit": "µA",
          "min": -10,
          "typ": 0.5,
          "max": 10,
          "conditions": "0 V ≤ Signal voltage ≤ VDDX1",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VDDx1 Undervoltage Rising Threshold",
          "symbol": "VDDxUV+",
          "kind": "electrical",
          "unit": "V",
          "min": 2.45,
          "typ": 2.65,
          "max": 2.9,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VDDx1 Undervoltage Falling Threshold",
          "symbol": "VDDxUV−",
          "kind": "electrical",
          "unit": "V",
          "min": 2.3,
          "typ": 2.5,
          "max": 2.75,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VDDx1 Hysteresis",
          "symbol": "VDDxUVH",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.15,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 1",
          "symbol": "IDD1 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 431,
          "typ": 539,
          "max": 701,
          "conditions": "@ 5VDC supply, 0V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 2",
          "symbol": "IDD2 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 431,
          "typ": 539,
          "max": 701,
          "conditions": "@ 5VDC supply, 0V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 1",
          "symbol": "IDD1 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 414,
          "typ": 518,
          "max": 673,
          "conditions": "@ 5VDC supply, 5V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 2",
          "symbol": "IDD2 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 414,
          "typ": 518,
          "max": 673,
          "conditions": "@ 5VDC supply, 5V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 1",
          "symbol": "IDD1 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 405,
          "typ": 506,
          "max": 658,
          "conditions": "@ 3.3VDC supply, 0V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 2",
          "symbol": "IDD2 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 405,
          "typ": 506,
          "max": 658,
          "conditions": "@ 3.3VDC supply, 0V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 1",
          "symbol": "IDD1 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 410,
          "typ": 512,
          "max": 666,
          "conditions": "@ 3.3VDC supply, 3.3V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Supply Current, side 2",
          "symbol": "IDD2 (Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": 410,
          "typ": 512,
          "max": 666,
          "conditions": "@ 3.3VDC supply, 3.3V input signal, CL = 0 pF",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Rated Dielectric Insulation Voltage (U3x)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V rms",
          "min": null,
          "typ": null,
          "max": 3000,
          "conditions": "1-minute duration",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Minimum External Air Gap (Clearance) (U3x)",
          "symbol": "L (CLR)",
          "kind": "electrical",
          "unit": "mm",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "Input terminals to output terminals, shortest distance through air",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Minimum External Tracking (Creepage) (U3x)",
          "symbol": "L (CRP)",
          "kind": "electrical",
          "unit": "mm",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "Input terminals to output terminals, shortest distance along body",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Minimum Internal Gap (Internal Clearance) (U3x)",
          "symbol": "",
          "kind": "electrical",
          "unit": "µm",
          "min": 11,
          "typ": null,
          "max": null,
          "conditions": "Insulation distance through insulation",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Tracking Resistance (Comparative Tracking Index) (U3x)",
          "symbol": "CTI",
          "kind": "electrical",
          "unit": "V",
          "min": 400,
          "typ": null,
          "max": null,
          "conditions": "DIN IEC 112/VDE 0303 Part 1; printed as >400",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "IC Junction to Ambient Thermal Resistance (U3x)",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "Thermocouple located at center of package underside",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input Capacitance",
          "symbol": "CI",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 3,
          "max": null,
          "conditions": "@1MHz",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Capacitance (Input to Output) (U3x)",
          "symbol": "CI-O",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 0.6,
          "max": null,
          "conditions": "@1MHz",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Maximum Working Insulation Voltage (U3x)",
          "symbol": "VIORM",
          "kind": "electrical",
          "unit": "V peak",
          "min": null,
          "typ": null,
          "max": 707,
          "conditions": "DIN VDE 0884-10",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Highest Allowable Overvoltage (U3x)",
          "symbol": "VIOTM",
          "kind": "absolute_maximum",
          "unit": "V peak",
          "min": null,
          "typ": null,
          "max": 4200,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Surge Isolation Voltage Basic (U3x)",
          "symbol": "VIOSM",
          "kind": "absolute_maximum",
          "unit": "V peak",
          "min": null,
          "typ": null,
          "max": 4615,
          "conditions": "Basic insulation, 1.2 µs rise time, 50 µs, 50% fall time",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature (safety limiting)",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "Maximum value allowed in the event of a failure",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Total Power Dissipation at 25°C (safety limiting)",
          "symbol": "PS",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1.56,
          "conditions": "At 25°C",
          "source_page": 9,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "π122u31"
  ],
  "discovery_pitch": "π122U31 (2Pai Semi) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "122u31.kicad_sym",
    "122u31.kicad_mod",
    "122u31.glb",
    "122u31.step",
    "122u31.lbr",
    "docs/hero.png",
    "docs/122u31-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "122u31-hero.glb",
    "122u31-hero.overlay.json",
    "122u31-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}