Why USB-C Splitters Can Cause Magic Smoke Release – Hackaday

🔍 Summary:

The YouTube channel Quiescent Current recently highlighted the dangers of using USB splitters with USB-C and USB Power Delivery (USB-PD) systems. These splitters can cause severe damage to devices by improperly distributing power. In the video, a simple demonstration with a resistor and LED showed how a device could negotiate a higher voltage for charging, which is then mistakenly applied to all devices connected to the splitter. This can lead to scenarios where devices that cannot handle higher voltages get damaged.

The discussion also touched on the broader implications and technical nuances of USB-PD and how splitters can disrupt the correct functioning of this system. It was emphasized that many commercially available splitters do not adhere to USB standards, making them risky to use. Properly designed hubs, however, should manage power distribution correctly by negotiating the appropriate voltage and current for each connected device independently.

The article also explored user experiences and technical solutions to mitigate risks associated with USB-C’s multifunctionality, which combines data transfer, power delivery, and video output in a single connector. This complexity can lead to confusion and potential misuse, underscoring the need for clearer standards and better consumer awareness to prevent device damage.

📌 Source: https://hackaday.com/2025/04/07/why-usb-c-splitters-can-cause-magic-smoke-release/