USB Type A Connector

The different versions of USB cables, like USB 2.0 and USB 3.0, are concerned with the functionality and speed of the USB cable; whereas, the type of USB cable (like USB Type A, USB Type B) essentially refers to the physical design of the plugs and ports.

The USB Type A connectors outlined in all three USB versions share basically the same form factor. This means that the USB Type A plug from any USB version will fit into the USB Type A receptacle from any other USB version and vice versa.

That said, there are some significant differences between USB 3.0 Type A connectors and those from USB 2.0 and USB 1.1.

USB 3.0 Type A connectors have nine pins, considerably more than the four pins that make up USB 2.0 and USB 1.1 Type A connectors. These additional pins are used to enable the faster data transfer rate found in USB 3.0 but they are placed in the connectors in a way that does not prevent them from physically working with Type A connectors from the previous USB standards.

USB A Types
USB A Types