USB & OTG giá cực tốt


Short for universal serial bus, USB (pronounced yoo-es-bee) is a plug and play interface that allows a computer lớn communicate with peripheral and other devices. USB-connected devices cover a broad range; anything from keyboards và mice lớn music players & flash drives. For more information on these devices, see our USB devices section.

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USB may also send power to lớn certain devices, such as powering smartphones and tablets và charging their batteries. The first commercial release of the Universal Serial Bus (version 1.0) was in January 1996. This industry-standard was then quickly adopted by Intel, Compaq, Microsoft, and other companies.

Where are the USB ports?

All modern computers have at least one USB port. Below is a list of the typical locations where you can find them.

Tablet computer - The USB connection on a tablet is located in the charging port và is usually Micro-USB và sometimes USB-C. Some tablets have additional ports USB ports.

USB devices

Today, many different USB devices connect lớn your computer. The danh sách below contains a few of the most common.

USB connector types

USB connectors come in different shapes and sizes. Most of the USB connectors, including the standard USB, Mini-USB, & Micro-USB, have two or more variations of connectors. Further information on each type is provided below.



Mini-USB, also known as mini-B, is used with digital cameras & computer peripherals. Mini-USB has largely been replaced by Micro-USB & USB-C cables on newer devices.


Micro-USB, announced in 2007, was designed lớn replace Mini-USB. The two varieties of Micro-USB are Micro-AMicro-B, both featuring a connector kích thước of 6.85 x 1.8 mm, although Micro-A connectors feature a larger maximum overmold size. Micro-USB cables are often used to connect computer peripherals, clip game controllers, and for charging smartphones. While many companies are upgrading to lớn USB type-C connectors (next section), Micro-USB is still commonly used with electronic devices.

USB Type-C

The USB Type-C cable is featured on most modern-day android smartphones, flagship laptops, and other USB-connected devices. Unlike other forms of USB connections, USB-C cables are reversible, meaning they plug in correctly regardless of whether or not they are "upside down."

In addition to lớn charging batteries & transferring data, USB-C cables can display video. For this reason, some manufacturers have remove both standard USB và HDMI ports in favor of USB-C ports, as seen on the laptop macbook series of laptops.

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USB transfer speeds

USB 1.x is an external bus standard that supports data transfer rates of 12 Mbps and can support up khổng lồ 127 peripheral devices. The picture shows an example of a USB cable connected khổng lồ the USB port.

USB 2.0, also known as hi-speed USB, was developed by Compaq, Hewlett Packard, Intel, Lucent, Microsoft, NEC, & Phillips & was introduced in 2001. Hi-Speed USB can tư vấn a transfer rate of up lớn 480 megabits per second (Mbps) or 60 megabytes per second (MBps).

USB 3.0, also known as SuperSpeed USB, was first made available in November 2009 by Buffalo Technology, but the first certified devices weren't available until January 2010. USB 3.0 improved the USB 2.0 giải pháp công nghệ with speed and performance increases, improved power nguồn management, và increased bandwidth capability. It provides two unidirectional data paths for receiving and sending data at the same time. USB 3.0 supports transfer rates up to 5.0 gigabits per second (Gbps) or 640 megabytes per second (MBps). Following the release of USB 3.1, it's officially renamed "USB 3.1 Gen1" for sale purposes. The first certified devices included motherboards from hãng asus and Gigabyte Technology. Dell began including USB 3.0 ports in their Inspiron & Dell XPS series of computers in April 2011.

USB 3.1, also known as SuperSpeed+, was made available as of July 31, 2013, và is the latest version of the USB protocol. USB 3.1 can transfer rates of up to lớn 10 Gbps, putting it in line with the first generation of Apple's Thunderbolt channel. Today, many devices use USB 3.0 & 3.1 revisions for improved performance và speed.

USB version compatibility

Each USB port version is backward compatible and forward compatible, meaning it can support any version below or above its current number. For example, devices designed with USB 1.1 & 2.0 giải pháp công nghệ work in a 3.0 port. However, it should be noted that devices with lower versions run at their native transfer speeds even though USB 3.0 is capable of higher. Similarly, if you connect a USB 3.1 device into a USB 2.0 port, the 3.1 device's max transfer rate is limited khổng lồ that of the 2.0 port.

USB cables - length & type

USB cables are available in multiple lengths, from a few inches to over 16 feet. The maximum length of a USB cable is 16 feet 5 inches (5 meters) for high-speed devices and 9 feet 10 inches (3 meters) for low-speed devices. These maximum lengths are due to data transfer timing and the risk of data loss if using longer cable lengths. However, using USB hubs, you can connect two USB cables to lớn extend the distance between the two devices effectively.

There are different types of USB cables as well. As we mentioned above, there are different transfer speeds (2.0 and 3.0) for USB. Similarly, there are different types of USB cables to match those speeds. You can get a USB 2.0 cable for use with a device using USB 2.0 or a USB 3.0 cable for use with a device using USB 3.0.

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USB extension cables can connect lớn one kết thúc of a USB cable, extending the length of the connection. However, avoid extending the cable beyond the maximum USB data transfer distance of 16 feet 5 inches unless you're using a USB hub khổng lồ boost the signal.