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A USB header is a group of pins, typically on a computer motherboard or expansion card, to which an internal USB cable can be attached to provide extra USB ports. Typically, one header is a group of two USB ports.

The most common USB header layout is:

5v, D-, D+, Gnd, NC

5v, D-, D+, Gnd, Key

Some may be in reverse order, or completely different, so caution is advised.

Manufacturers generally design USB headers on to their motherboards if they have extra USB ports left over from the design of the rear I/O. Instead of terminating these extra USB ports, they can be left as USB headers to be used by some other means.

Many computer cases feature "Front USB Ports". These front USB ports connect to the USB headers on the motherboard. This is the most common use for USB headers.

Words of Cauton: -

There are several varieties of header pin layouts ranging from 4 pin, to 10 pin, The most common ones are 5 pin for single USB header, to 9 pin for dual USB, where pin 9 and 10 are not used. Pin 9 and blank pin 10 are to ensure the plug is inserted correctly.

Some 9 pin header plugs have different places where the blank pin is and also a different wiring order. You must have the right wiring order and plug for your device, and to your motherboard, or you may do some serious damage to your PC and/or USB devices. It is wise to always double check the pins and wiring via a PC Tech before buying and installing any internal after market USB device.

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