USB & OTG giá cực tốt


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

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USB may also send power khổng lồ certain devices, such as powering smartphones & tablets & 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, và other companies.

Where are the USB ports?

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

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

USB devices

Today, many different USB devices connect to your computer. The list 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, and 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 and computer peripherals. Mini-USB has largely been replaced by Micro-USB và USB-C cables on newer devices.


Micro-USB, announced in 2007, was designed khổng lồ replace Mini-USB. The two varieties of Micro-USB are Micro-A & Micro-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 lớn connect computer peripherals, đoạn phim game controllers, và 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 game android smartphones, flagship laptops, & 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 lớn charging batteries and transferring data, USB-C cables can display video. For this reason, some manufacturers have remove both standard USB and HDMI ports in favor of USB-C ports, as seen on the laptop apple 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 & can tư vấn up to lớn 127 peripheral devices. The picture shows an example of a USB cable connected lớn the USB port.

USB 2.0, also known as hi-speed USB, was developed by Compaq, Hewlett Packard, Intel, Lucent, Microsoft, NEC, and Phillips & was introduced in 2001. Hi-Speed USB can tư vấn a transfer rate of up to 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 technology with speed và performance increases, improved power nguồn management, and increased bandwidth capability. It provides two unidirectional data paths for receiving & sending data at the same time. USB 3.0 supports transfer rates up to lớn 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 marketing purposes. The first certified devices included motherboards from hãng asus and Gigabyte Technology. Dell began including USB 3.0 ports in their Inspiron và Dell XPS series of computers in April 2011.

USB 3.1, also known as SuperSpeed+, was made available as of July 31, 2013, and 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 và 3.1 revisions for improved performance & speed.

USB version compatibility

Each USB port version is backward compatible và forward compatible, meaning it can tư vấn any version below or above its current number. For example, devices designed with USB 1.1 and 2.0 technology 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 lớn 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 & 9 feet 10 inches (3 meters) for low-speed devices. These maximum lengths are due lớn data transfer timing và 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 khổng lồ 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.

USB extension cables can connect to one over 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.