MicroUSB Info

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Mini and Micro connectors

USB Mini A (left) and USB Mini B (right) plugs
Various connectors have been used for smaller devices such as digital cameras, smartphones, and tablet computers. These include the now-deprecated[42] (i.e. de-certified but standardized) Mini-A and Mini-AB connectors (Mini-B connectors are still supported but not OTG (On The Go, i.e. mobile) compliant).[43] The Mini-B USB connector was standard for transferring data to and from the early data phones and PDAs, such as Blackberrys.
The Mini-A and Mini-B plugs are approximately 3 by 7 mm. The micro-USB plugs have a similar width and approximately half the thickness, enabling their integration into thinner portable devices. The micro-A connector is 6.85 by 1.8 mm with a maximum overmold size of 11.7 by 8.5 mm. The micro-B connector is 6.85 by 1.8 mm with a maximum overmold size of 10.6 by 8.5 mm.[44] The Micro-USB connector was announced by the USB-IF on 4 January 2007.

The Mini-A connector and the Mini-AB receptacle connector were deprecated on 23 May 2007.

While many currently available devices and cables still use Mini plugs, the newer Micro connectors are being widely adopted and as of December 2010, they are the most widely used [citation needed]. The thinner micro connectors are intended to replace the Mini plugs in new devices including smartphones, personal digital assistants, and cameras.

The Micro plug design is rated for at least 10,000 connect-disconnect cycles—significantly more than the Mini plug design.[48] It is also designed to reduce the mechanical wear on the device; instead the easier-to-replace cable is designed to bear the mechanical wear of connection and disconnection. The Universal Serial Bus Micro-USB Cables and Connectors Specification details the mechanical characteristics of Micro-A plugs, Micro-AB receptacles (which accept both Micro-A and Micro-B plugs), and Micro-B plugs and receptacles,[48] along with a Standard-A receptacle to Micro-A plug adapter.
The cellular phone carrier group, Open Mobile Terminal Platform (OMTP) in 2007 endorsed Micro-USB as the standard connector for data and power on mobile devices[49] In addition, on 22 October 2009 the International Telecommunication Union (ITU) has also announced that it had embraced micro-USB as the Universal Charging Solution its “energy-efficient one-charger-fits-all new mobile phone solution”, and added: “Based on the Micro-USB interface, UCS chargers also include a 4-star or higher efficiency rating—up to three times more energy-efficient than an unrated charger.”

The European Standardisation Bodies CEN, CENELEC and ETSI (independent of the OMTP/GSMA proposal) defined a common External Power Supply (EPS) for use with smartphones sold in the EU based on micro-USB.

14 of the world’s largest mobile phone manufacturers signed the EU’s common EPS Memorandum of Understanding (MoU).

Apple Inc., one of the original MoU signers, make micro-USB adapters available – as permitted in the Common EPS MoU – for its iPhones equipped with Apple’s proprietary 30 pin dock connector or (later) “Lightning” connector.

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