Different USB types

A USB port is a standard cable connection interface for personal computers and consumer electronics devices. USB stands for Universal Serial Bus, an industry standard for short-distance digital data communications. USB ports allow USB devices to be connected to each other with and transfer digital data over USB cables. They can also supply electric power across the cable to devices that need it.

Both wired and wireless versions of the USB standard exist, although only the wired version involves USB ports and cables.

USB-A, USB-B, and USB-C Port Types

Several major types of physical layouts exist for USB ports:

USB-A (Type A)

The rectangular USB Type-A connector approximately 1.4 cm (9/16 in) length by 0.65 cm (1/4 in) height is typically used for wired mice and keyboards. USB sticks normally feature USB-A connectors also.

USB-B (Type B)

Less common than type A, USB B devices are nearly square in shape and are commonly found on routers, computers, printers, and game consoles

Micro and mini USB

So-called Micro USB versions of both USB-A and USB-B also exist - smaller versions than their base counterparts, popular on mobile devices. Older but now obsolete "mini USB" versions can also be found on many old devices.

Mini A

This is not one of the more commonly used styles. This type has five contact points. All positioned in a straight line.

Mini B

This style was previously used in cell phones for charging capabilities. This type has five contact points. All positioned in a straight line.

Micro A

The Micro A is not as common as the Micro B. This type has five contact points. All positioned in a straight line.

Micro B

This style is very common. It is currently used for most major cell phone charging connectors. This type has five contact points. All positioned in a straight line.

USB Type C

With dimensions of 0.84 cm by 0.26cm, this newer standard is designed to replace both A and B with smaller ports to better support the thinner form factors of mobile devices.

Speed standards of USB

There are various USB speed standards. They are categorized depending on their data transfer speeds. To clear the confusion, we have come up with a chart to decode the speed capabilities of each USB version.

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