MCP23009T-E

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  "slug": "mcp23009t-e",
  "title": "MCP23009T-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",
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  "component": {
    "mpn": "MCP23009T-E",
    "manufacturer": "Microchip Tech",
    "package": "SSOP-20-208mil",
    "pin_count": 20,
    "category": "Interface",
    "subcategory": "I/O Expanders",
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      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
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      "mouser": {
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    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply pin; the device operates from 1.8V to 5.5V per the datasheet features list."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "3",
        "name": "SCL",
        "type": "input",
        "description": "Serial clock input for the I2C interface (MCP23009)."
      },
      {
        "number": "4",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Serial data I/O for the I2C interface (MCP23009)."
      },
      {
        "number": "5",
        "name": "ADDR",
        "type": "input",
        "description": "Hardware address pin that allows up to eight slave devices on the bus."
      },
      {
        "number": "6",
        "name": "RESET",
        "type": "input",
        "description": "Hardware reset input."
      },
      {
        "number": "7",
        "name": "INT",
        "type": "output",
        "description": "Interrupt output for the port; can be configured as active-high, active-low or open-drain."
      },
      {
        "number": "8",
        "name": "GP0",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "9",
        "name": "GP1",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "10",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "11",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "12",
        "name": "GP2",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "13",
        "name": "GP3",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "14",
        "name": "GP4",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "15",
        "name": "GP5",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "16",
        "name": "GP6",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "17",
        "name": "GP7",
        "type": "bidirectional",
        "description": "Bidirectional I/O pin with 5.5V tolerant inputs and open-drain outputs; can be enabled for interrupt-on-change and/or internal pull-up resistor."
      },
      {
        "number": "18",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "19",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "20",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference pin."
      }
    ],
    "provenance": {
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        "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 20-lead SSOP pinout is taken from the 20-lead SSOP column of Table 1-1 (I2C pinout, MCP23009) on; Pages 2 and 3 of the datasheet are partly missing from the supplied excerpt, and no SSOP top-view pi; The table lists NC on SSOP pins 2, 10, 11, 18 and 19. Pins 10 and 11 are NC here while GP2 is pin 12"
        ],
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        "cost_usd": 0.0522,
        "at": "2026-10-18T10:04:42"
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        "pages": 52,
        "sha256": "70744ea2313e65a6",
        "source_tier": "lcsc"
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      "pins": {
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        "described": 20,
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        "refuses_to_fabricate": true
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      "Manufacturer": "Microchip Tech",
      "Package": "SSOP-20-208mil",
      "Category": "Interface",
      "Pins": "20"
    },
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