3 ms·
The thing is, adding an inline fuse doesn't guarantee that the host would be safe: if the fuse doesn't blow quick enough and lets enough current through, that's
by tentacleuno 2y ago
The thing is, adding an inline fuse doesn't guarantee that the host would be safe: if the fuse doesn't blow quick enough and lets enough current through, that's bad (plus, you'd have to add a fuse to P-, D+, D- and P+ just to be sure, not to mention USB3). The best option would probably be a complete isolation of the USB device from the host, with a hub that then transfers D- and D+ to the host without a direct electrical connection (while providing its own P- and P+). Think TOSlink, but for USB.
- utensil4778 2y agoGalvanic USB isolators are a thing. Mostly for medical applications, but it's literally a chip you can buy off the shelf that provides total electrical isolation (with the addition of an isolated 5v supply).
- 6SixTy 2y agoThere are digital isolator ICs, like ADUM3166 from Analog Devices, though like none of them are for USB 3.0+ Awful lot of isolation transformers in the IC diagram, so I'm sure that something like the transformers used for Ethernet could be reused to protect basically any USB ports from a USB killer attack, though they are awfully big for a smartphone
- cartoonfoxes 2y agoThe industrial hubs I'm familar with use optoisolators to separate the host and attached devices, I think. Advantech has a USB-3 version (P/N USB-4630), but I can't speak to these personally.