TCA9548A

{
  "schema_version": 1,
  "type": "component",
  "slug": "tca9548a",
  "title": "TCA9548A",
  "brief": "TI 8-channel bidirectional I2C switch, TSSOP-24. Fans one bus to 8, 3 address pins, reset. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "i2c-mux",
    "i2c-switch",
    "tssop-24",
    "texas-instruments"
  ],
  "component": {
    "mpn": "TCA9548A",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-24",
    "pin_count": 24,
    "category": "Interface IC",
    "subcategory": "8-channel I2C switch / multiplexer",
    "datasheet": "https://www.ti.com/lit/ds/symlink/tca9548a.pdf",
    "parts": {
      "symbol": "tca9548a.kicad_sym",
      "footprint": "tca9548a.kicad_mod",
      "model_3d": "tca9548a-etched.glb",
      "model_3d_plain": "tca9548a.glb",
      "lbr": "tca9548a.lbr",
      "model_3d_step": "tca9548a-etched.step",
      "model_3d_step_plain": "tca9548a.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "I2C target address input bit 0. Hard-wire directly to VCC (logic 1) or GND (logic 0) to set the lower address bit of the TCA9548A's 7-bit I2C address, allowing up to eight devices on the same bus."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "I2C target address input bit 1. Hard-wire directly to VCC or GND to set the second address bit of the TCA9548A's 7-bit I2C address."
      },
      {
        "number": "3",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input. Asserting low resets the I2C/SMBus state machine, deselects all channels, and initializes the device without cycling power (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC; min pulse width 6 ns). Tie to VCC or VDPUM through a pull-up resistor if unused."
      },
      {
        "number": "4",
        "name": "SD0",
        "type": "bidirectional",
        "description": "Downstream channel 0 serial data line. Connect to VDPU0 (channel-0 pull-up reference voltage) through an external pull-up resistor. When channel 0 is selected in the control register, SD0 is bidirectionally coupled to SDA via a low-RON pass gate (RON ≈ 4Ω at 5V)."
      },
      {
        "number": "5",
        "name": "SC0",
        "type": "bidirectional",
        "description": "Downstream channel 0 serial clock line. Connect to VDPU0 through an external pull-up. Coupled to SCL through a pass gate when channel 0 is enabled."
      },
      {
        "number": "6",
        "name": "SD1",
        "type": "bidirectional",
        "description": "Downstream channel 1 serial data line. Connect to VDPU1 through a pull-up resistor; coupled to SDA when channel 1 is selected."
      },
      {
        "number": "7",
        "name": "SC1",
        "type": "bidirectional",
        "description": "Downstream channel 1 serial clock line. Connect to VDPU1 through a pull-up resistor; coupled to SCL when channel 1 is selected."
      },
      {
        "number": "8",
        "name": "SD2",
        "type": "bidirectional",
        "description": "Downstream channel 2 serial data line. Connect to VDPU2 through a pull-up resistor; coupled to SDA when channel 2 is selected."
      },
      {
        "number": "9",
        "name": "SC2",
        "type": "bidirectional",
        "description": "Downstream channel 2 serial clock line. Connect to VDPU2 through a pull-up resistor; coupled to SCL when channel 2 is selected."
      },
      {
        "number": "10",
        "name": "SD3",
        "type": "bidirectional",
        "description": "Downstream channel 3 serial data line. Connect to VDPU3 through a pull-up resistor; coupled to SDA when channel 3 is selected."
      },
      {
        "number": "11",
        "name": "SC3",
        "type": "bidirectional",
        "description": "Downstream channel 3 serial clock line. Connect to VDPU3 through a pull-up resistor; coupled to SCL when channel 3 is selected."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Ground return for the supply and all I/O reference levels."
      },
      {
        "number": "13",
        "name": "SD4",
        "type": "bidirectional",
        "description": "Downstream channel 4 serial data line. Connect to VDPU4 through a pull-up resistor; coupled to SDA when channel 4 is selected."
      },
      {
        "number": "14",
        "name": "SC4",
        "type": "bidirectional",
        "description": "Downstream channel 4 serial clock line. Connect to VDPU4 through a pull-up resistor; coupled to SCL when channel 4 is selected."
      },
      {
        "number": "15",
        "name": "SD5",
        "type": "bidirectional",
        "description": "Downstream channel 5 serial data line. Connect to VDPU5 through a pull-up resistor; coupled to SDA when channel 5 is selected."
      },
      {
        "number": "16",
        "name": "SC5",
        "type": "bidirectional",
        "description": "Downstream channel 5 serial clock line. Connect to VDPU5 through a pull-up resistor; coupled to SCL when channel 5 is selected."
      },
      {
        "number": "17",
        "name": "SD6",
        "type": "bidirectional",
        "description": "Downstream channel 6 serial data line. Connect to VDPU6 through a pull-up resistor; coupled to SDA when channel 6 is selected."
      },
      {
        "number": "18",
        "name": "SC6",
        "type": "bidirectional",
        "description": "Downstream channel 6 serial clock line. Connect to VDPU6 through a pull-up resistor; coupled to SCL when channel 6 is selected."
      },
      {
        "number": "19",
        "name": "SD7",
        "type": "bidirectional",
        "description": "Downstream channel 7 serial data line. Connect to VDPU7 through a pull-up resistor; coupled to SDA when channel 7 is selected."
      },
      {
        "number": "20",
        "name": "SC7",
        "type": "bidirectional",
        "description": "Downstream channel 7 serial clock line. Connect to VDPU7 through a pull-up resistor; coupled to SCL when channel 7 is selected."
      },
      {
        "number": "21",
        "name": "A2",
        "type": "input",
        "description": "I2C target address input bit 2. Hard-wire directly to VCC or GND to set the third address bit of the TCA9548A's 7-bit I2C address (base 1110_A2A1A0)."
      },
      {
        "number": "22",
        "name": "SCL",
        "type": "bidirectional",
        "description": "Upstream I2C serial clock bus (controller side). Connect to VDPUM (the controller's I2C reference voltage) through a pull-up resistor. Standard-mode up to 100 kHz, Fast-mode up to 400 kHz."
      },
      {
        "number": "23",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Upstream I2C serial data bus (controller side). Connect to VDPUM through a pull-up resistor. Open-drain output capable of sinking 6 mA at VOL = 0.6 V."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage input, 1.65 V to 5.5 V (absolute max 7 V). Also sets the maximum high-level voltage that the internal pass gates will pass between the upstream and downstream I2C buses."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/tca9548a.pdf",
        "pages": 42,
        "sha256": "2137822fd7128945",
        "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"
    }
  },
  "metadata": {
    "specs": {
      "Type": "8-channel bidirectional I2C switch",
      "Channels": "8 (SC0/SD0 ... SC7/SD7)",
      "Addresses": "3 pins (up to 8 devices / 64 channels)",
      "Reset": "Active-low RESET",
      "Voltage translation": "Channels can bridge different bus voltages",
      "Supply voltage": "1.65-5.5 V",
      "Package": "TSSOP-24",
      "Body (L×W×H)": "7.8 × 4.4 × 1.2 mm"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "tca9548a",
    "i2c multiplexer",
    "i2c switch 8 channel",
    "i2c bus expander"
  ],
  "discovery_pitch": "TI TCA9548A 8-channel bidirectional I2C switch/multiplexer (TSSOP-24) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tca9548a.kicad_sym",
    "tca9548a.kicad_mod",
    "tca9548a.glb",
    "tca9548a.lbr",
    "docs/hero.png",
    "docs/tca9548a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tca9548a-etched.step"
  ],
  "variants": [
    {
      "mpn": "TCA9548APWR (TSSOP-24, tape & reel)",
      "kind": "packaging"
    }
  ]
}