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This article mainly introduces the differences between USB3.0 and 2.0. it is very detailed and has a certain reference value. Friends who are interested must finish it!

1. USB3.0 and 2.0 concepts

Compared with 2.0, usb3.0 introduces full-duplex data transmission. Of the five new lines, two are used to send data, the other two to receive data, and one is a ground wire. In other words, usb 3.0 can read and write at full speed synchronously. Previous versions of usb did not support full-duplex data transfer. In human words, USB3.0 is the "9" root line, and 2. 0 is the "4" root line.

2. Advantages and disadvantages of USB3.0 and 2. 0

At present, the maximum transmission bandwidth of usb2.0 is 480Mbps (that is, 60MB/s), while the maximum transmission bandwidth of usb3.0 is as high as 5.0Gbps (500MB/s). The usb3.0 standard requires that the power supply capacity of usb3.0 interface is 1A and usb2.0 is 0.5A; however, Xiaomi (red) and Huawei 5A (purple) are USB2.0, but their phones all support USB3.0. In practical application, the transmission rate in the application will be slowed down because of some objective reasons (such as the main control chip used in the storage device, whether the manufacturing quality of the circuit board is good or not).

Generally speaking, usb3.0 has the advantages of fast transmission speed, easy to use, support hot plug, flexible connection, independent power supply and so on. However, usb2.0 is currently better for device compatibility and does not support upward compatibility.

3. Distinguish (it is recommended to use contacts to distinguish)

(1) Color distinction: the middle plastic sheet color: usb3.0- blue; usb2.0- black. However, some devices do not have a standard color distinction. For example, some usb2.0 devices, such as mice, MP3, data lines, etc., may be black or white plastic sheets, while some non-native usb3.0 supported by the master chip may not be blue. In addition, the usb 3.0 cable will be "thicker" because usb 3.0 has four more internal cables than the 2.0 cable. And some unscrupulous merchants produce interfaces that are 2.0 but deliberately use blue, disguised as 3.0, and the color distinction is not accurate.

(2) contact distinction: USB3.0 is "9" root line (contact), 2.0 is "4" root line (contact). If there are no 5 metal contacts on the vertical section (note that it is not 4 holes,), it can be determined that it is not USB3.0.

Reminder: look directly, can not see clearly, turn on the cell phone flashlight, it is easy to see, the vertical section of USB3.0 is 5 holes, each hole has a metal contact; USB2.0 is 4 holes, there are no metal nodes on the hole. In the plane, USB3.0 and 2. 0 are both four lines.

Below, the black USB at the top is 2.0 and the blue USB at the bottom is 3.0

These are all the contents of this article entitled "what are the differences between USB3.0 and 2.0". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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