SI8621AB-B-IS

{
  "schema_version": 1,
  "type": "component",
  "slug": "si8621ab-b-is",
  "title": "SI8621AB-B-IS",
  "brief": "SILICON LABS 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",
    "si8621ab-b-is",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "SI8621AB-B-IS",
    "manufacturer": "SILICON LABS",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface ICs",
    "subcategory": "Digital Isolators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/41a3dc512ea99abd1d109f4b6d0b45cc.pdf",
    "parts": {
      "symbol": "si8621ab-b-is.kicad_sym",
      "footprint": "si8621ab-b-is.kicad_mod",
      "model_3d": "si8621ab-b-is-hero.glb",
      "model_3d_plain": "si8621ab-b-is-etched.glb",
      "model_3d_step": "si8621ab-b-is-etched.step",
      "model_3d_step_plain": "si8621ab-b-is.step",
      "lbr": "si8621ab-b-is.lbr"
    },
    "distributor_links": {
      "lcsc": "C430265",
      "digikey": "SI8621AB-B-IS-ND",
      "mouser": "634-SI8621AB-B-IS"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T00:39:02Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "SI8621AB-B-IS-ND",
        "status": "found",
        "lifecycle": "Active"
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      "mouser": {
        "pn": "634-SI8621AB-B-IS",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD1",
        "type": "power_in",
        "description": "Side 1 power supply, operating range 2.5 to 5.5 V (absolute maximum 7.0 V)."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "bidirectional",
        "description": "Side 1 digital input or output."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "bidirectional",
        "description": "Side 1 digital input or output."
      },
      {
        "number": "4",
        "name": "GND1",
        "type": "power_in",
        "description": "Side 1 ground."
      },
      {
        "number": "5",
        "name": "GND2",
        "type": "power_in",
        "description": "Side 2 ground."
      },
      {
        "number": "6",
        "name": "B2",
        "type": "bidirectional",
        "description": "Side 2 digital input or output."
      },
      {
        "number": "7",
        "name": "B1",
        "type": "bidirectional",
        "description": "Side 2 digital input or output."
      },
      {
        "number": "8",
        "name": "VDD2",
        "type": "power_in",
        "description": "Side 2 power supply, operating range 2.5 to 5.5 V (absolute maximum 7.0 V)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Table 5.1 labels A1, A2, B1 and B2 only as 'Digital I/O' (side 1/side 2 input or output). It does no; The Si8621 has no EN pins in Table 5.1, even though the datasheet says the family has Enable inputs."
        ],
        "pages_sent": 21,
        "cost_usd": 0.1523,
        "at": "2026-10-27T00:38:31"
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        "pages": 47,
        "sha256": "918e2e1a50310d63",
        "source_tier": "lcsc"
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        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "checked": "2026-10-27",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "SILICON LABS",
      "Package": "SOIC-8",
      "Category": "Interface ICs",
      "Pins": "8"
    },
    "appearance": {
      "housing": {
        "quote": "4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components.",
        "page": 38,
        "doc": "ds.pdf",
        "material": "PC"
      },
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        },
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          "symbol": "VDD1",
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          "name": "Supply Voltage VDD2",
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        {
          "name": "Storage Temperature",
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          "min": -65,
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          "name": "Ambient Temperature Under Bias",
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        {
          "name": "Junction Temperature",
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        {
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          "unit": "V",
          "min": -0.5,
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        {
          "name": "Input Voltage",
          "symbol": "VI",
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          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": null,
          "conditions": "max printed as VDD + 0.5 V",
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        },
        {
          "name": "Output Voltage",
          "symbol": "VO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": null,
          "conditions": "max printed as VDD + 0.5 V",
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        },
        {
          "name": "Output Current Drive Channel (all devices unless otherwise stated)",
          "symbol": "IO",
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          "unit": "mA",
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          "conditions": "All devices unless otherwise stated",
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        {
          "name": "Output Current Drive Channel (Si86xxxA-x-xx devices)",
          "symbol": "IO",
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          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 22,
          "conditions": "All Si86xxxA-x-xx devices",
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        {
          "name": "Maximum Isolation (Input to Output)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "VRMS",
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          "max": 4500,
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        {
          "name": "Lead Solder Temperature",
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          "kind": "absolute_maximum",
          "unit": "ºC",
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          "conditions": "10 s",
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        },
        {
          "name": "Junction-to-Air Thermal Resistance",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "ºC/W",
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        {
          "name": "VDD Undervoltage Threshold (rising)",
          "symbol": "VDDUV+",
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          "unit": "V",
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        {
          "name": "VDD Undervoltage Threshold (falling)",
          "symbol": "VDDUV–",
          "kind": "electrical",
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          "min": 1.88,
          "typ": 2.16,
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          "conditions": "VDD1, VDD2 falling",
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        {
          "name": "VDD Undervoltage Hysteresis",
          "symbol": "VDDHYS",
          "kind": "electrical",
          "unit": "mV",
          "min": 50,
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        {
          "name": "Positive-Going Input Threshold",
          "symbol": "VT+",
          "kind": "electrical",
          "unit": "V",
          "min": 1.4,
          "typ": 1.67,
          "max": 1.9,
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        {
          "name": "Negative-Going Input Threshold",
          "symbol": "VT–",
          "kind": "electrical",
          "unit": "V",
          "min": 1,
          "typ": 1.23,
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        {
          "name": "Input Hysteresis",
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          "unit": "V",
          "min": 0.38,
          "typ": 0.44,
          "max": 0.5,
          "conditions": "",
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        {
          "name": "High Level Input Voltage",
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          "kind": "electrical",
          "unit": "V",
          "min": 2,
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          "max": null,
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        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
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          "min": null,
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        {
          "name": "High Level Output Voltage (5 V)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 4.8,
          "max": null,
          "conditions": "Ioh = –4 mA; min printed as VDD1,VDD2 – 0.4; VDD = 5 V±10%",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage (3.3 V)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 3.1,
          "max": null,
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          "source_page": 15,
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        },
        {
          "name": "High Level Output Voltage (2.5 V)",
          "symbol": "VOH",
          "kind": "electrical",
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          "min": null,
          "typ": 2.3,
          "max": null,
          "conditions": "Ioh = –4 mA; min printed as VDD1,VDD2 – 0.4; VDD = 2.5 V±5%",
          "source_page": 20,
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        },
        {
          "name": "Low Level Output Voltage",
          "symbol": "VOL",
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          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": 0.4,
          "conditions": "Iol = 4 mA",
          "source_page": 9,
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        },
        {
          "name": "Input Leakage Current",
          "symbol": "IL",
          "kind": "electrical",
          "unit": "µA",
          "min": -10,
          "typ": null,
          "max": 10,
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        },
        {
          "name": "Output Impedance",
          "symbol": "ZO",
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          "unit": "Ω",
          "min": null,
          "typ": 50,
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        {
          "name": "Enable Input High Current",
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          "unit": "µA",
          "min": null,
          "typ": 2,
          "max": null,
          "conditions": "VENx = VIH",
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        {
          "name": "Enable Input Low Current",
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          "max": null,
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          "name": "DC Supply Current VDD1, input 0",
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          "kind": "electrical",
          "unit": "mA",
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          "typ": 1.2,
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          "conditions": "Si8621Ax, VI = 0",
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        {
          "name": "DC Supply Current VDD2, input 0",
          "symbol": "IDD2",
          "kind": "electrical",
          "unit": "mA",
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          "typ": 1.2,
          "max": 1.9,
          "conditions": "Si8621Ax, VI = 0",
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        {
          "name": "DC Supply Current VDD1, input 1",
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          "unit": "mA",
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          "conditions": "Si8621Ax, VI = 1",
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        {
          "name": "DC Supply Current VDD2, input 1",
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          "conditions": "Si8621Ax, VI = 1",
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          "name": "1 Mbps Supply Current VDD1",
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          "conditions": "Si8621Ax, All inputs = 500 kHz square wave, CI = 15 pF on all outputs",
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        {
          "name": "1 Mbps Supply Current VDD2",
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          "typ": 1.9,
          "max": 2.9,
          "conditions": "Si8621Ax, All inputs = 500 kHz square wave, CI = 15 pF on all outputs",
          "source_page": 12,
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          "name": "Maximum Data Rate",
          "symbol": "",
          "kind": "timing",
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          "name": "Minimum Pulse Width",
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          "max": 250,
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        {
          "name": "Propagation Delay",
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          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 35,
          "conditions": "See Figure 4.2 Propagation Delay Timing",
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          "name": "Pulse Width Distortion |tPLH – tPHL|",
          "symbol": "PWD",
          "kind": "timing",
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          "typ": null,
          "max": 25,
          "conditions": "See Figure 4.2 Propagation Delay Timing",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay Skew",
          "symbol": "tPSK(P-P)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 13,
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        {
          "name": "Channel-Channel Skew",
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          "unit": "ns",
          "min": null,
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          "name": "Output Rise Time",
          "symbol": "tr",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 2.5,
          "max": 4,
          "conditions": "CL = 15 pF, See Figure 4.2",
          "source_page": 13,
          "source": "datasheet"
        },
        {
          "name": "Output Fall Time",
          "symbol": "tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 2.5,
          "max": 4,
          "conditions": "CL = 15 pF, See Figure 4.2",
          "source_page": 13,
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        {
          "name": "Common Mode Transient Immunity",
          "symbol": "CMTI",
          "kind": "electrical",
          "unit": "kV/µs",
          "min": 35,
          "typ": 50,
          "max": null,
          "conditions": "VI = VDD or 0 V, VCM = 1500 V",
          "source_page": 13,
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        {
          "name": "Enable to Data Valid",
          "symbol": "ten1",
          "kind": "timing",
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          "min": null,
          "typ": 6,
          "max": 11,
          "conditions": "See Figure 4.1 ENABLE Timing Diagram",
          "source_page": 13,
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        {
          "name": "Enable to Data Tri-State",
          "symbol": "ten2",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 8,
          "max": 12,
          "conditions": "See Figure 4.1 ENABLE Timing Diagram",
          "source_page": 13,
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        {
          "name": "Start-up Time",
          "symbol": "tSU",
          "kind": "timing",
          "unit": "µs",
          "min": null,
          "typ": 15,
          "max": 40,
          "conditions": "",
          "source_page": 14,
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        },
        {
          "name": "Peak eye diagram jitter",
          "symbol": "tJIT(PK)",
          "kind": "timing",
          "unit": "ps",
          "min": null,
          "typ": 350,
          "max": null,
          "conditions": "See Figure 2.2 Modulation Scheme",
          "source_page": 13,
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          "name": "Capacitance (Input-Output)",
          "symbol": "ΧIO",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 2,
          "max": null,
          "conditions": "f = 1 ΜΗz, NB SOIC-8",
          "source_page": 26,
          "source": "datasheet"
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        {
          "name": "Input Capacitance",
          "symbol": "CI",
          "kind": "electrical",
          "unit": "pF",
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