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How come most portable phone chargers use USBA rather than Micro USB for the output port? Is USBA supposed to be more tolerant? If they use Micro USB for the output (as well), the user could just use a Micro USB-to-Micro USB cable instead, which should be able to handle even 2A, right?

Thanks

Kar
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    My guess is that MicroUSB-B -> USB-A cables are _much_ more common. I've never even seen a dual-ended MicroUSB-B cable. – Shamtam Jul 14 '15 at 15:11
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    Grab one of your double ended micro usb cables and have a look at it... oh wait, you dont have one, well... – PlasmaHH Jul 14 '15 at 15:11
  • How come they're so rare? A chicken-egg problem? – Kar Jul 14 '15 at 15:13
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    USB A & B cables are not supposed to have the same connector on both ends. – pjc50 Jul 14 '15 at 15:27
  • @pjc50 The USB spec does define a Micro-A to Micro-B cable, but I have never seen one "in the wild". –  Jul 18 '15 at 05:35

1 Answers1

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The standard specifies USBA as the primary charging connector.

USBA makes much sense here as it is widely used on laptops and notebooks.

USBA is mechanically more rugged and reliable than Mini connectors.

There is a somewhat related discussion on this stack exchange question.

Community
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Russell McMahon
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