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USB 5-Wire Cables Information and Custom Ordering Plans
Standard USB 2.0 cables have 4 wires: two data wires, one power, and one ground wire. USB 5 wire cables have the same 4 wires, with the addition of a fifth wire that can be used for various applications. For standard Mini/Micro-B connectors, Pin 4 is not connected, and can be used for special applications. These cables may not work with all applications.