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USB 2.0 vs USB 3.0-Difference between USB 2.0 and USB 3.0

This page compares USB 2.0 vs USB 3.0 versions and mentions difference between USB 2.0 and USB 3.0.

The USB stands for Universal Serial Bus. It is interface similar to RS232 and RS485 but supports higher data rates at various distances. USB supports peer to peer communication. In this type of interface, communication takes place between host and peripheral and not between two hosts (or peripherals). The USB standard defines specifications for cables, connectors and protocols. It mentions requirements for connection, communication and PS (power supply) between PCs and peripheral devices. There are various versions of USB which include v1.x, v2.x and V3.x. Each of these versions support different data rates.

USB 2.0

It is successor to USB 1.0
Release data: 2000
Transfer rate/speed: 480 Mbps
Power consumption: 100 mA
Backward compatibility: USB 1.x
Smart charging not available
Bidirectional data transfer not supported

USB 2.0 vs USB 3.0

USB 3.0

It is successor to USB 2.0
Release data: 2008
Transfer rate/speed: About 5 Gbps
Power consumption: 900 mA
Backward compatibility: USB 2.0, USB 1.x
Bidirectional data transfer is supported
Smart charging available

Tabular difference between USB 2.0 and USB 3.0

Following table summarizes difference between USB 2.0 and USB 3.0 versions.

Features USB 2.0 USB 3.0
Transfer Rate 480 Mbps 4800 Mbps
Data Transfer 1 Way Bi-directional
Also known as High Speed USB Super Speed USB
Power Output 2.5W 4.5W (Known as USB 3.1 Gen1), 100W(USB 3.1 Gen2)

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