Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Chip Model | TCA9548A |
| Channel Count | 8 Independent I2C Channels |
| Operating Voltage | 3.3V to 5V DC |
| Interface Type | I2C / IIC Bus |
| Address Selection | Configurable via A0, A1, A2 Pins |
| Reset Function | Hardware Reset Pin Included |
| Board Dimensions | 45mm x 35mm |
| Mounting Holes | 4 x M3 Standard Holes |
| Compatibility | Arduino, Raspberry Pi, ESP32, STM32 |
| Package Contents | 1x TCA9548A Board, 1x Pin Header Set |
Anonymous
Mar 23, 2026
Rating: 5/5
Great for learning
Used this for my university embedded systems project. It made expanding the bus incredibly easy. The voltage levels work perfectly with both 3.3V and 5V microcontrollers.
Anonymous
Mar 20, 2026
Rating: 4/5
Solid build quality
Works exactly as described. The soldering on the pins was clean. Only minor issue is that the silk screen for the channel numbers is a bit small, but readable with a magnifier.
Anonymous
Mar 19, 2026
Rating: 5/5
No more address headaches
Finally, a simple solution for connecting multiple OLED displays and RTC modules on the same bus. The code library support for Arduino is excellent.
Anonymous
Mar 14, 2026
Rating: 5/5
Essential for complex projects
If you are building a robot with multiple I2C modules, this is a must-have. It handles the switching very fast and reliably. Documentation online is plentiful too.
Anonymous
Mar 10, 2026
Rating: 5/5
Perfect for sensor arrays
This board solved my address conflict issues immediately. I connected eight identical temperature sensors without any hassle. The reset function is a nice touch for debugging.
Anonymous
Mar 01, 2026
Rating: 4/5
Reliable multiplexer
We bought ten of these for our lab. They have been running continuously for weeks without dropping connections. Would give 5 stars if it came with standoffs included.
Q: Can this board handle 5V logic levels directly?
A: Yes, the TCA9548A supports operating voltages from 3.3V to 5V, making it compatible with most standard microcontrollers without level shifters.
Q: Does this support high-speed I2C modes?
A: The TCA9548A supports standard-mode (100 kHz) and fast-mode (400 kHz) I2C buses. It is not designed for high-speed (3.4 MHz) modes.
Q: Is there a library available for Python on Raspberry Pi?
A: Yes, you can use standard SMBus libraries in Python. There are also specific community-driven examples available on GitHub for controlling the channel selection.
Q: What happens if I pull the reset pin low?
A: Pulling the reset pin low will disable all channels and reset the internal register to its default state, effectively disconnecting all downstream devices until reconfigured.
Q: How do I change the I2C address of the board itself?
A: You can configure the board's address by setting the voltage levels on the A0, A1, and A2 pins. This allows up to 8 different addresses on the same bus.
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