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TCA9548ARGERQ1

TITCA9548ARGERQ1

Texas Instruments
Switch ICs - Various Automotive 8-channel 1.65- to 5.25v I2C/
138,535 in stock
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Overview

The TCA9548ARGERQ1 is an automotive-grade I2C switch (multiplexer) with eight selectable downstream channels. It supports operation across a wide supply range (described as 1.65 V to 5.25 V) and is intended for systems that need to route or isolate multiple I2C devices from a single master in automotive environments.

Why Choose This Part

This part provides eight independently switchable I2C channels, reducing bus contention and allowing multiple identical-address devices to be used on one master. Its wide supply range makes it compatible with 1.8 V, 3.3 V, and 5 V domains, and the automotive qualification increases confidence for use in vehicle systems. Using a protocol-level switch is simpler and lower-overhead than gateway or MCU-based multiplexing for many applications.

Applications

Multi-sensor multiplexing
Connect and switch between multiple I2C sensors that share addresses or need isolated buses (common in automotive sensor clusters).
ECU subsystem isolation
Isolate noisy or power-cycled peripherals from the main I2C bus during diagnostics, firmware updates, or fault conditions.
Board-level bring-up and test
Enable selective connection of I2C peripherals for manufacturing test, calibration, or in-field diagnostics without changing wiring.
Mixed-voltage system integration
Interface master and peripherals that operate at different logic voltages by placing appropriate pull-ups on the selected channel(s).

Getting Started

Start by reading TI's datasheet and application notes for recommended pull-up resistor values and bus capacitance limits. Use any microcontroller or development board with an I2C master to control the device; ensure correct device address configuration and appropriate pull-ups on the selected channel. Pay attention to bus isolation behavior when switching channels and verify voltage domains and level shifting where needed.

Also Consider

TCA9548APWR TITexas Instruments - Same 8-channel I2C switch from TI in a common TSSOP package (non-automotive grade) for general-purpose applications.
TCA9546APWR TITexas Instruments - A 4-channel alternative if fewer downstream busses are required, simplifying routing and possibly lowering cost.