Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards
Origin	-
Chip Model	TCA9548A
Interface Type	I2C / IIC
Channel Count	8 Channels
Operating Voltage	3.3V - 5V
Address Selection	Configurable via A0, A1, A2 pins
Bus Speed Support	Up to 400 kHz
Board Dimensions	45mm x 25mm
Mounting Style	Through-hole with header pins
Reset Function	Active Low Reset Pin Included
Application Scope	IoT, Sensor Networks, Embedded Systems

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Great value, minor soldering needed

Works exactly as described for my Raspberry Pi project. The headers were not pre-soldered, so be prepared to do a little work. Once set up, the channel switching is seamless.

Anonymous

Mar 25, 2026

Rating: 5/5

Solved my bus capacitance issues

Not only does it expand channels, but it also isolates capacitance effectively. My long I2C bus lines are now stable. Excellent product for industrial prototyping.

Anonymous

Mar 25, 2026

Rating: 5/5

Reliable multiplexer

I've used this in a robotics arm control system to manage multiple servos and sensors. It handles the traffic well and hasn't dropped a single packet in weeks of testing.

Anonymous

Mar 10, 2026

Rating: 5/5

Essential for university projects

Bought this for my final year embedded systems project. The documentation online is plentiful, and the board itself is very forgiving for beginners. Highly recommended for learning.

Anonymous

Mar 08, 2026

Rating: 4/5

Good performance, compact size

The form factor is great for fitting into tight enclosures. I deducted one star only because the silk screen for the address pins is a bit small, but otherwise, it's a fantastic module.

Anonymous

Mar 05, 2026

Rating: 5/5

Perfect for expanding I2C sensors

This board solved my address conflict issues immediately. I connected eight different temperature sensors without any hassle. The build quality is solid and the labeling on the PCB is very clear.

5 FAQ

Q: Does this support 1.8V logic levels?

A: The board is designed primarily for 3.3V and 5V logic levels. While the chip itself has some tolerance, we recommend using a level shifter if your host controller operates strictly at 1.8V to ensure reliability.

Q: Can I daisy-chain multiple of these modules?

A: Absolutely. By configuring the A0, A1, and A2 address selection pins differently on each board, you can daisy-chain up to 8 modules, giving you access to 64 individual I2C channels.

Q: What happens if power is lost to one of the downstream devices?

A: One of the key features of the TCA9548A is that it isolates the buses. If a downstream device loses power or hangs, it will not affect the main I2C bus or the other channels.

Q: Is this board compatible with Arduino Uno?

A: Yes, the TCA9548A board is fully compatible with Arduino Uno. You just need to connect the VCC, GND, SDA, and SCL pins and use a standard I2C library to control the channels.

Q: Are there example code libraries available for Python?

A: Yes, since this uses standard I2C protocols, it works with generic Python libraries like smbus2 for Raspberry Pi. We also provide specific usage examples in our GitHub repository linked in the product manual.

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