π131U31

{
  "schema_version": 1,
  "type": "component",
  "slug": "131u31",
  "title": "π131U31",
  "brief": "2Pai Semi Digital Isolators, SOIC-16. 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",
    "π131u31",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "π131U31",
    "manufacturer": "2Pai Semi",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Interface ICs",
    "subcategory": "Digital Isolators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/eb1321e11132529e370a13f5e6a877f3.pdf",
    "parts": {
      "symbol": "131u31.kicad_sym",
      "footprint": "131u31.kicad_mod",
      "model_3d": "131u31-hero.glb",
      "model_3d_plain": "131u31-etched.glb",
      "model_3d_step": "131u31-etched.step",
      "model_3d_step_plain": "131u31.step",
      "lbr": "131u31.lbr"
    },
    "distributor_links": {
      "lcsc": "C471596"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T19:48:07Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD1",
        "type": "power_in",
        "description": "Primary-side (VDD1) supply of the isolator, 3 V to 5.5 V recommended operating range, bypassed to GND1 with a 0.1 uF to 10 uF low-ESR ceramic capacitor."
      },
      {
        "number": "2",
        "name": "GND1",
        "type": "power_in",
        "description": "Ground reference for the primary-side VDD1 supply."
      },
      {
        "number": "3",
        "name": "VIA",
        "type": "input",
        "description": "Channel A input on the VDD1 side, with logic thresholds of 0.7*VDD1 (high) and 0.3*VDD1 (low) at the recommended levels."
      },
      {
        "number": "4",
        "name": "VIB",
        "type": "input",
        "description": "Channel B input on the VDD1 side, with logic thresholds of 0.7*VDD1 (high) and 0.3*VDD1 (low) at the recommended levels."
      },
      {
        "number": "5",
        "name": "VOC",
        "type": "output",
        "description": "Channel C output on the VDD1 side (reverse channel from VIC), with 6 mA maximum recommended output current."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect pin (datasheet: empty pin)."
      },
      {
        "number": "7",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect pin; on the π131U3X device this pin is empty (it is the EN1 output enable only on π131U6X)."
      },
      {
        "number": "8",
        "name": "GND1",
        "type": "power_in",
        "description": "Ground reference for the primary-side VDD1 supply."
      },
      {
        "number": "9",
        "name": "GND2",
        "type": "power_in",
        "description": "Ground reference for the secondary-side VDD2 supply."
      },
      {
        "number": "10",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect pin; on the π131U3X device this pin is empty (it is the EN2 output enable only on π131U6X)."
      },
      {
        "number": "11",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect pin (datasheet: empty pin)."
      },
      {
        "number": "12",
        "name": "VIC",
        "type": "input",
        "description": "Channel C input on the VDD2 side, with logic thresholds of 0.7*VDD2 (high) and 0.3*VDD2 (low) at the recommended levels."
      },
      {
        "number": "13",
        "name": "VOB",
        "type": "output",
        "description": "Channel B output on the VDD2 side, with 6 mA maximum recommended output current."
      },
      {
        "number": "14",
        "name": "VOA",
        "type": "output",
        "description": "Channel A output on the VDD2 side, with 6 mA maximum recommended output current."
      },
      {
        "number": "15",
        "name": "GND2",
        "type": "power_in",
        "description": "Ground reference for the secondary-side VDD2 supply."
      },
      {
        "number": "16",
        "name": "VDD2",
        "type": "power_in",
        "description": "Secondary-side (VDD2) supply of the isolator, 3 V to 5.5 V recommended operating range, bypassed to GND2 with a 0.1 uF to 10 uF low-ESR ceramic capacitor."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin-type and direction assignments for VOC (pin 5, output on VDD1 side) and VIC (pin 12, input on VD; Pins 7 and 10 are NC/EN1 and NC/EN2 on the family; for π131U31 (3X variant) the datasheet says they "
        ],
        "pages_sent": 18,
        "cost_usd": 0.1715,
        "at": "2026-10-22T19:47:09"
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      "datasheet": {
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        "pages": 18,
        "sha256": "d3202c14b062facd",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
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        "refuses_to_fabricate": true
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  "metadata": {
    "specs": {
      "Manufacturer": "2Pai Semi",
      "Package": "SOIC-16",
      "Category": "Interface ICs",
      "Pins": "16"
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    "characteristics": {
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        {
          "name": "Output voltage (VOA, VOB)",
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          "name": "Secondary side average output current per channel",
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        {
          "name": "Common-mode transient immunity",
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        {
          "name": "Storage temperature",
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        {
          "name": "Operating ambient temperature",
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        {
          "name": "Communication rate",
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        {
          "name": "Junction temperature",
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          "max": 0.1,
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          "name": "Output low voltage",
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          "name": "Input current per channel",
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          "conditions": "0 V ≤ signal voltage ≤ VDDx",
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        {
          "name": "VDDx undervoltage threshold, rising",
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          "name": "VDDx undervoltage threshold, falling",
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        {
          "name": "VDDx undervoltage hysteresis",
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          "min": null,
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          "name": "Quiescent supply current IDD1",
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          "unit": "mA",
          "min": 0.56,
          "typ": 0.7,
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          "name": "Quiescent supply current IDD1",
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        {
          "name": "Quiescent supply current IDD2",
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          "min": 0.85,
          "typ": 1.07,
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          "conditions": "5VDC, input high 5V, CL = 0pF",
          "source_page": 6,
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        {
          "name": "Quiescent supply current IDD1",
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          "unit": "mA",
          "min": 0.51,
          "typ": 0.63,
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          "conditions": "3.3VDC, input low 0V, CL = 0pF",
          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "Quiescent supply current IDD2",
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          "unit": "mA",
          "min": 0.81,
          "typ": 1.01,
          "max": 1.32,
          "conditions": "3.3VDC, input low 0V, CL = 0pF",
          "source_page": 6,
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        {
          "name": "Quiescent supply current IDD1",
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          "conditions": "3.3VDC, input high 3.3V, CL = 0pF",
          "source_page": 6,
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          "name": "Quiescent supply current IDD2",
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          "min": 0.84,
          "typ": 1.05,
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          "conditions": "3.3VDC, input high 3.3V, CL = 0pF",
          "source_page": 6,
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          "name": "Supply current IDD1 at 150kbps",
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        {
          "name": "Supply current IDD2 at 150kbps",
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          "name": "Supply current IDD1 at 150kbps",
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          "name": "Rated isolation voltage",
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          "name": "IC junction-to-air thermal resistance",
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