MCP23S08T-E

{
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  "slug": "mcp23s08t-e",
  "title": "MCP23S08T-E",
  "brief": "Microchip Tech I/O Expanders, SSOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "interface",
    "mcp23s08t-e",
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  "component": {
    "mpn": "MCP23S08T-E",
    "manufacturer": "Microchip Tech",
    "package": "SSOP-20-208mil",
    "pin_count": 20,
    "category": "Interface",
    "subcategory": "I/O Expanders",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586203729258795008",
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    "distributor_links": {
      "lcsc": "C145600"
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    "distributor_check": {
      "checked_at": "2026-10-18T09:35:24Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
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      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SCL/SCK",
        "type": "input",
        "description": "Serial clock input; on the MCP23S08 SPI variant this pin is SCK."
      },
      {
        "number": "2",
        "name": "SDA/SI",
        "type": "input",
        "description": "Serial data input on the MCP23S08 (the MCP23008 uses this pin as bidirectional serial data I/O)."
      },
      {
        "number": "3",
        "name": "A2/SO",
        "type": "output",
        "description": "Serial data output on the MCP23S08; the datasheet lists this shared pin as I/O because it serves as hardware address A2 on the MCP23008."
      },
      {
        "number": "4",
        "name": "A1",
        "type": "input",
        "description": "Hardware address input that must be biased externally."
      },
      {
        "number": "5",
        "name": "A0",
        "type": "input",
        "description": "Hardware address input that must be biased externally."
      },
      {
        "number": "6",
        "name": "RESET",
        "type": "input",
        "description": "External reset input that must be biased externally."
      },
      {
        "number": "7",
        "name": "NC/CS",
        "type": "input",
        "description": "External chip select input on the MCP23S08; SPI write and read operations are started by lowering CS."
      },
      {
        "number": "8",
        "name": "INT",
        "type": "output",
        "description": "Interrupt output that can be configured as active-high, active-low or open-drain."
      },
      {
        "number": "9",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "10",
        "name": "N/C",
        "type": "unconnected",
        "description": "No connect pin in the SSOP package."
      },
      {
        "number": "11",
        "name": "N/C",
        "type": "unconnected",
        "description": "No connect pin in the SSOP package."
      },
      {
        "number": "12",
        "name": "GP0",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "13",
        "name": "GP1",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "14",
        "name": "GP2",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "15",
        "name": "GP3",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "16",
        "name": "GP4",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "17",
        "name": "GP5",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "18",
        "name": "GP6",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "19",
        "name": "GP7",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin that can be enabled for interrupt-on-change and/or an internal weak pull-up resistor."
      },
      {
        "number": "20",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply; the datasheet gives 1.8 V to 5.5 V at -40°C to +85°C, and 4.5 V to 5.5 V at -40°C to +125°C."
      }
    ],
    "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 package hint says SSOP-20-208mil, but the extracted text only gives a 20-Lead Plastic Shrink Sma; The MCP23S08 has two hardware address pins (A1, A0), so A2 is not a separate function on this varian; Table 1-1 lists pin 3 as I/O because it is shared with the MCP23008 A2 function. The type is set to "
        ],
        "pages_sent": 11,
        "cost_usd": 0.0544,
        "at": "2026-10-18T09:33:19"
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        "pages": 44,
        "sha256": "573ae3991f57d129",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "SSOP-20-208mil",
      "Category": "Interface",
      "Pins": "20"
    },
    "characteristics": {
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          "name": "Voltage on all other pins with respect to VSS (except VDD), minimum",
          "symbol": "",
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        {
          "name": "Voltage on VDD with respect to VSS",
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        {
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          "conditions": "VI < 0 or VI > VDD",
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          "conditions": "VO < 0 or VO > VDD",
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        {
          "name": "Supply Voltage",
          "symbol": "VDD",
          "kind": "electrical",
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          "min": 1.8,
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        },
        {
          "name": "VDD Rise Rate to Ensure Power-on Reset",
          "symbol": "SVDD",
          "kind": "electrical",
          "unit": "V/ms",
          "min": 0.05,
          "typ": null,
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          "conditions": "Design guidance only. Not tested.",
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        {
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          "conditions": "SCL/SCK = 1 MHz",
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        {
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          "name": "Output Leakage Current, I/O port pins",
          "symbol": "ILO",
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        {
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          "symbol": "IPU",
          "kind": "electrical",
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          "min": 40,
          "typ": 75,
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          "conditions": "VDD = 5V, GP Pins = VSS; –40°C ≤ TA ≤ +85°C",
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        {
          "name": "Output Low-Voltage, GPIO",
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        {
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        {
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        {
          "name": "CS Setup Time",
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          "name": "CS Hold Time",
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          "min": 100,
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          "name": "CS Disable Time",
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