EmbeddedRelated.com
    Parts    TI TCA9548 I2C Multiplexer Family    TCA9548APWR    TCA9548APWR
TCA9548APWR

TITCA9548APWR

Texas Instruments
Same 8-channel I2C switch from TI in a common TSSOP package (non-automotive grade) for general-purpose applications.
18,570 in stock
Mouser Compare Prices

Overview

The TCA9548APWR is an 8-channel I2C switch from Texas Instruments packaged in a TSSOP body for general-purpose applications. It lets a single I2C master select and communicate with one or more downstream I2C buses independently, avoiding address conflicts and isolating bus segments. This variant is the non-automotive (general-purpose) TSSOP version.

Why Choose This Part

Using an 8-channel I2C switch like the TCA9548APWR simplifies wiring when you need many I2C devices or identical addresses by providing independent downstream buses controlled over I2C. It reduces software complexity compared with bit-banged address-swapping and helps isolate bus noise and faults to a single channel. The small TSSOP package makes it easy to fit on compact PCBs.

Applications

Address conflict resolution
Connect multiple identical I2C sensors or devices with the same 7-bit address by switching them onto separate downstream buses.
Sensor multiplexing in robots and drones
Manage many sensors from one microcontroller while isolating noise and preventing bus contention on each sensor group.
Test fixtures and production racks
Select among multiple DUTs or instrumented boards on the same master I2C host for automated testing.
Expandable sensor hubs
Build modular sensor hubs that can add or remove downstream I2C segments without changing the master wiring.

Getting Started

You can use this part with any microcontroller or single-board computer that supports I2C (Arduino, Raspberry Pi, STM32, etc.). Read the TI datasheet for the command register format and example transactions; start by using an I2C scanner to confirm the switch address, then write the channel-control byte to enable downstream buses. Remember to provide appropriate pull-up resistors on the I2C lines and consider separate pull-ups per downstream segment if you need isolation.

Also Consider

TCA9546APWR TITexas Instruments - A 4-channel I2C switch from TI when you need fewer channels in the same family and package style.
PCA9548APW NXP Semiconductors - An alternative vendor implementation of an 8-channel I2C switch with similar functionality.
PCA9546APW NXP Semiconductors - A 4-channel I2C switch alternative if you prefer NXP parts or need fewer downstream channels.