I've been searching around the web and am not able to find any female connector for the micro-A USB other than the micro-AB. On Wikipedia the receptacle list doesn't show a micro-A female.

Was the male micro-A plug only able to fit into the AB port?

  • If there is a male Micro-A USB connector then there has to be a female plug, thats just how it works, cables might just not exist though. But they do – Ramhound Jun 15 '15 at 11:05
  • The female version that I usually see with the micro-A USB male is the micro-AB receptacle. I can't find just the micro-A female though. – QMord Jun 15 '15 at 17:34
  • What difference does it make if the AB receptacle works? – Ramhound Jun 15 '15 at 18:24
  • I'd like to know if the USB-IF ever included a micro-A receptacle in their specifications, and if not, why? – QMord Jun 15 '15 at 18:50

No, there is no such thing as a micro-A receptacle. There is only a micro-AB receptacle. The Micro-USB Cables and Connectors Specification is available in the USB 2.0 specification zip file, and says:

The Micro-USB specification defines the following additional connectors:

  • Micro-B plug and receptacle
  • Micro-AB receptacle
  • Micro-A plug.

No micro-A receptacle.

Was the male micro-A plug only able to fit into the AB port?

Yes. This is shown in Table 4-1. "Plugs Accepted By Receptacles":

Table 4-1. Plugs Accepted By Receptacles Receptacle Plugs Accepted Standard-A Standard-A Standard-B Standard-B Mini-B Mini-B Micro-B Micro-B Micro-AB Micro-A or Micro-B

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    Thanks, I appreciate the answer. I know it's been a while since I asked lol – QMord Oct 19 '16 at 15:38

It looks to me like micro A is necessarily included in micro AB, but nothing else, as, correct me if I'm wrong but the following quote seems to suggest A is responsible for power and not much else.

"The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device. If an application on the B-device requires the role of host, then the Host Negotiation Protocol (HNP) is used to temporarily transfer the host role to the B-device."

  • 1
    Indeed, it’s all related to USB OTG. Though almost no device manufacturer actually cares and most OTG-capable devices have Micro-B jacks. A Micro-A jack will always be compatible with Micro-B plugs, hence the name AB. – Daniel B Jun 16 '15 at 7:00

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