3 ms·

Yes. Since USB-C devices can draw significantly more power than USB-A can supply, any USB-C device into USB-A port adapters are disallowed.

• akavel 8y ago
  Uh? Then how do I plug my USB-C Samsung phone into an USB 2.0 A port on my laptop with an official Samsung cable found in the phone's box? Do I misunderstand something? Is the cable "illegal"?
  • anilakar 8y ago
    The real reason is to prevent hooking up two dumb Type-A host side power supplies, as I pointed out in another post. A properly implemented Type-C device will not draw high currents without power negotiation. (I'm looking at you, Nintendo)
  • mbreese 8y ago
    Cable not adapter. IIRC a cable is okay but the adapter version is not. Like mentioned above/below, this is to prevent other USB-A things from causing problems. When you have a fixed cable, you remove a lot of the potential issues for misuse.
    • deleted 8y ago
      [deleted]