TCA9534

{
  "schema_version": 1,
  "type": "component",
  "slug": "tca9534",
  "title": "TCA9534",
  "brief": "TI 8-bit I2C I/O expander with interrupt, TSSOP-16. Eight I/O, INT output, 8 addresses, 1.65-5.5 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "io-expander",
    "gpio-expander",
    "i2c",
    "tssop-16",
    "texas-instruments"
  ],
  "component": {
    "mpn": "TCA9534",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Interface",
    "subcategory": "I2C I/O expander",
    "datasheet": "https://www.ti.com/lit/ds/symlink/tca9534.pdf",
    "parts": {
      "symbol": "tca9534.kicad_sym",
      "footprint": "tca9534.kicad_mod",
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      "lbr": "tca9534.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "I2C hardware address input bit 0. Tie directly to VCC or GND to set the device slave address. Allows up to eight TCA9534 devices on the same I2C bus."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "I2C hardware address input bit 1. Tie directly to VCC or GND to set the device slave address."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "I2C hardware address input bit 2. Tie directly to VCC or GND to set the device slave address."
      },
      {
        "number": "4",
        "name": "P0",
        "type": "bidirectional",
        "description": "P-port I/O bit 0. Push-pull output structure; configured as an input at power-on. IOH max -10 mA, IOL up to 25 mA (Tj <= 65 C)."
      },
      {
        "number": "5",
        "name": "P1",
        "type": "bidirectional",
        "description": "P-port I/O bit 1. Push-pull; configured as an input at power-on."
      },
      {
        "number": "6",
        "name": "P2",
        "type": "bidirectional",
        "description": "P-port I/O bit 2. Push-pull; configured as an input at power-on."
      },
      {
        "number": "7",
        "name": "P3",
        "type": "bidirectional",
        "description": "P-port I/O bit 3. Push-pull; configured as an input at power-on."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "9",
        "name": "P4",
        "type": "bidirectional",
        "description": "P-port I/O bit 4. Push-pull; configured as an input at power-on."
      },
      {
        "number": "10",
        "name": "P5",
        "type": "bidirectional",
        "description": "P-port I/O bit 5. Push-pull; configured as an input at power-on."
      },
      {
        "number": "11",
        "name": "P6",
        "type": "bidirectional",
        "description": "P-port I/O bit 6. Push-pull; configured as an input at power-on."
      },
      {
        "number": "12",
        "name": "P7",
        "type": "bidirectional",
        "description": "P-port I/O bit 7. Push-pull; configured as an input at power-on."
      },
      {
        "number": "13",
        "name": "INT",
        "type": "output",
        "description": "Active-low open-drain interrupt output. Asserted when an input port changes state; connect to VCC through a pullup resistor. IOL must be externally limited to 7 mA max."
      },
      {
        "number": "14",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input. Connect to VCC through a pullup resistor. Supports 100-kHz and 400-kHz operation."
      },
      {
        "number": "15",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data line, open-drain bidirectional. Connect to VCC through a pullup resistor. IOL up to 8 mA at VOL = 0.5 V."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage input, 1.65 V to 5.5 V. Bypass locally to GND with a decoupling capacitor."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/tca9534.pdf",
        "pages": 42,
        "sha256": "797c1fc96502df7c",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "6ad5e98224d02a427d9a6b929a28dbc158b9925fba5adec12db05079f1016948",
        "checked": "2026-10-07",
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        "checked": "2026-10-26",
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  },
  "metadata": {
    "specs": {
      "Type": "8-bit I2C I/O expander",
      "Interface": "I2C (up to 400 kHz)",
      "I/O": "8 pins (P0-P7)",
      "Interrupt": "INT output (interrupt-on-change)",
      "Addresses": "8 (A0-A2)",
      "Supply": "1.65-5.5 V",
      "Package": "TSSOP-16"
    }
  },
  "sections": [
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  "discovery_triggers": [
    "tca9534",
    "8-bit io expander",
    "i2c gpio with interrupt",
    "add gpio over i2c"
  ],
  "discovery_pitch": "TI TCA9534 8-bit I2C I/O expander with interrupt (TSSOP-16) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "variants": [
    {
      "mpn": "TCA9534PWR (TSSOP-16)",
      "kind": "packaging"
    },
    {
      "mpn": "TCA9534ADWR (SOIC-16, variant address)",
      "kind": "packaging"
    },
    {
      "mpn": "TCA9534RGTR (VQFN-16)",
      "kind": "packaging"
    }
  ]
}