TCA9535

{
  "schema_version": 1,
  "type": "component",
  "slug": "tca9535",
  "title": "TCA9535",
  "brief": "TI 16-bit I2C I/O expander with interrupt, SSOP-24. Sixteen I/O in two banks, INT output, 8 addresses. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "io-expander",
    "gpio-expander",
    "i2c",
    "ssop-24",
    "texas-instruments"
  ],
  "component": {
    "mpn": "TCA9535",
    "manufacturer": "Texas Instruments",
    "package": "SSOP-24",
    "pin_count": 24,
    "category": "Interface",
    "subcategory": "I2C I/O expander",
    "datasheet": "https://www.ti.com/lit/ds/symlink/tca9535.pdf",
    "parts": {
      "symbol": "tca9535.kicad_sym",
      "footprint": "tca9535.kicad_mod",
      "model_3d": "tca9535-etched.glb",
      "model_3d_plain": "tca9535.glb",
      "model_3d_step": "tca9535-etched.step",
      "model_3d_step_plain": "tca9535.step",
      "lbr": "tca9535.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "INT",
        "type": "output",
        "description": "Active-low, open-drain interrupt output. Asserts when any P-port input changes state; connect to VCC through an external pull-up resistor. IOL up to 3 mA (VOL = 0.4 V)."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "I2C slave address input bit 1. Tie directly to VCC or GND to set the device address; combined with A0/A2 selects one of eight bus addresses."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "I2C slave address input bit 2. Tie directly to VCC or GND to set the device address."
      },
      {
        "number": "4",
        "name": "P00",
        "type": "bidirectional",
        "description": "Port 0 bit 0. Push-pull I/O; configured as input at power-on. If left unused when configured as input, tie to VCC or GND through ~10 kΩ."
      },
      {
        "number": "5",
        "name": "P01",
        "type": "bidirectional",
        "description": "Port 0 bit 1. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "6",
        "name": "P02",
        "type": "bidirectional",
        "description": "Port 0 bit 2. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "7",
        "name": "P03",
        "type": "bidirectional",
        "description": "Port 0 bit 3. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "8",
        "name": "P04",
        "type": "bidirectional",
        "description": "Port 0 bit 4. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "9",
        "name": "P05",
        "type": "bidirectional",
        "description": "Port 0 bit 5. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "10",
        "name": "P06",
        "type": "bidirectional",
        "description": "Port 0 bit 6. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "11",
        "name": "P07",
        "type": "bidirectional",
        "description": "Port 0 bit 7. Push-pull I/O; configured as input at power-on. Octal P07-P00 total drive limited to 80 mA."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground. Continuous current through GND limited to 250 mA."
      },
      {
        "number": "13",
        "name": "P10",
        "type": "bidirectional",
        "description": "Port 1 bit 0. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "14",
        "name": "P11",
        "type": "bidirectional",
        "description": "Port 1 bit 1. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "15",
        "name": "P12",
        "type": "bidirectional",
        "description": "Port 1 bit 2. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "16",
        "name": "P13",
        "type": "bidirectional",
        "description": "Port 1 bit 3. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "17",
        "name": "P14",
        "type": "bidirectional",
        "description": "Port 1 bit 4. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "18",
        "name": "P15",
        "type": "bidirectional",
        "description": "Port 1 bit 5. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "19",
        "name": "P16",
        "type": "bidirectional",
        "description": "Port 1 bit 6. Push-pull I/O; configured as input at power-on."
      },
      {
        "number": "20",
        "name": "P17",
        "type": "bidirectional",
        "description": "Port 1 bit 7. Push-pull I/O; configured as input at power-on. Octal P17-P10 total drive limited to 80 mA."
      },
      {
        "number": "21",
        "name": "A0",
        "type": "input",
        "description": "I2C slave address input bit 0. Tie directly to VCC or GND to set the device address."
      },
      {
        "number": "22",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input. Connect to VCC through a pull-up resistor. Supports Standard (100 kHz) and Fast (400 kHz) modes."
      },
      {
        "number": "23",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data bus. Open-drain; connect to VCC through a pull-up resistor. IOL up to 3 mA (VOL = 0.4 V)."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 1.65 V to 5.5 V. Continuous current through VCC limited to 160 mA. Recommended decoupling with a bypass capacitor near the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/tca9535.pdf",
        "pages": 47,
        "sha256": "413a6d0c3d8f1a2e",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 24,
        "described": 24,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "tca9535.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          8.2,
          2.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "77dd0a1fc7e70e9eda1bfde9dde937dc6e391803cff9978790523c850c85a21d",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tca9535-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          8.2,
          2.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "e2b2644122be7d46e99f843b254f7fa8bada4341d54d2d323c33cd7ebb19a356",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "16-bit I2C I/O expander",
      "Interface": "I2C (up to 400 kHz)",
      "I/O": "16 pins (two 8-bit ports)",
      "Interrupt": "INT output (interrupt-on-change)",
      "Addresses": "8 (A0-A2)",
      "Supply": "1.65-5.5 V",
      "Package": "SSOP-24"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "tca9535",
    "16-bit io expander",
    "i2c gpio 16 channel",
    "add 16 gpio over i2c"
  ],
  "discovery_pitch": "TI TCA9535 16-bit I2C I/O expander with interrupt (SSOP-24) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tca9535.kicad_sym",
    "tca9535.kicad_mod",
    "tca9535.glb",
    "tca9535.step",
    "tca9535.lbr",
    "docs/hero.png",
    "docs/tca9535-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tca9535-etched.step"
  ],
  "variants": [
    {
      "mpn": "TCA9535DBR (SSOP-24)",
      "kind": "packaging"
    },
    {
      "mpn": "TCA9535PWR (TSSOP-24)",
      "kind": "packaging"
    },
    {
      "mpn": "TCA9535RTWR (VQFN-24)",
      "kind": "packaging"
    }
  ]
}