this post was submitted on 03 Apr 2025
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109
Surprisingly enough, shady USB-C multiport adapters can be dangerous (www.youtube.com)
submitted 2 days ago by firstHexodrome@lemmy.blahaj.zone to c/technology@lemmy.world
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cross-posted from: https://lemmy.dbzer0.com/post/41325747

geteilt von: https://lemmy.dbzer0.com/post/41324008

I have one of those shown and never knew that they can make my devices go boom...

Any other things that may cause a surprise bonfire in my cable drawer?

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[–] tal@lemmy.today 15 points 1 day ago

I mean, that splitter device cannot be USB compliant, if it's giving more than 5V to a device that never negotiated more than 5V.

I'd also guess that if it's just silently feeding the second device from what the phone has negotiated, it's probably not compliant in that it's probably drawing more from its power source than the phone has negotiated -- USB devices are responsible for indicating what they'll draw.

You could make that multiport device USB-compliant, but it'd require having the splitter be a DC-DC power source and having it negotiate some PD draw sufficient to power both devices.