USB 3.0 connector is designed to support 5Gbps bandwidth 'SuperSpeed' data transfer, whereas, lower data rate can be transmitted with backward compatibility to USB 2.0 ports. However, USB 3.0 Type A processes additional pins that are not in the USB 2.0 A Type. Inheriting the same design to the A-Type connector used in USB 2.0 & USB 1.1 application, USB 3.0 A is also provides a 'downstream' connection that is designed for use only on host controllers and hubs. USB 2.0 A Female to Crimp Housing Cables.Be aware that typical A-A cables are not intended for connection between two host computers or computer to hub. Though not that common, USB A male to A male cables are used by some implementers to make connections between two USB A style female port. As such, it is important to remember while purchasing USB cables it is safest to make sure at least one of the plugs is a USB A. This is because USB host will supply a 5V DC power on the VBUS pin.

USB-A socket is designed to provide a 'downstream' connection intended for host controllers and hubs, rarely implemented as an 'upstream' connector on a peripheral device. There is also 900mA power support in order to change devices with USB cable.Also known as USB standard A connector, the USB A connector is primarily be used on host controllers in computers and hubs. USB 3.0 provides 3.2 Gbit/s data transmission speed. In this version some electronic devices like phone, Bluetooth ears can be charged through USB connection. This version also bring different type of connectors like Mini-A and Mini-B . Version 2.0 released at 2000 and provides 280 Mbit/s speed. 2.0 is the most popular version currently. Version is 2.0 is major version and bring a lot of new features and performance options. This version brought big performance with 12 Mbit/s support. This version is mainly used for keyboards, mouse and joystick.

The first reliable and globally accepted version is 1.0. In each new version the comp-ability and speed is improved. Here list of devices those can use USB for connections

USB is designed as universal protocol which can be used by most of the computer peripherals and companies. At the time there are problems with other protocols like speed, plugin and play, comp-ability. USB is a protocol emerged mid-1900s for connecting computer peripherals to the computer easily.

Serial connector types