What is a micro USB cable?

A micro USB cable is a miniaturized USB interface used for connecting compact mobile devices. It consists of a plug, housing, contacts, and a printed circuit board that includes a twisted pair of wires. These wires are utilized for transmitting data and current. The micro USB cable is a smaller version of the standard USB interface that is designed specifically for mobile devices such as smartphones, MP3 players, digital cameras, GPS devices, and printers. It was first introduced in 2007.

This cable is often used as a fast-charging cable to connect smartphones and other small devices to chargers, computer peripherals, and external hard drives. It can also act as an adapter to enable data exchange among different devices.

There are three types of Micro USB connectors

Micro USB Type A: This type of connector is typically used for cell phones, tablets, and other small electronic devices. It has a rectangular connector with a small piece of plastic on top.

Micro USB Type B: This type of connector is typically used for computers, printers, and other larger electronic devices. It has a square connector and has a small hole on its top.

Micro USB 3.0: This type of connector is a newer version of Micro USB 2.0, which supports faster transfer speeds. It has an extra set of pins that can accommodate twice as many wires.

The 3 types of Micro USB
The 3 types of Micro USB

Micro USB Cable Advantages

  1. Users can easily install and remove peripherals thanks to the plug-and-play feature.
  2. Peripherals are hot-swappable and the host computer can automatically configure system resources based on their addition or deletion.
  3. With up to 10,000 times the lifespan and strength of a regular plug, it provides exceptional durability.
  4. The blind plug structure is well-designed.
  5. It supports data transmission and charging simultaneously.
  6. Micro-USB connectors are smaller than standard USB and Mini-USB connectors, saving space and perfect for tiny devices.
  7. Micro-USB also supports USB On-The-Go (USB OTG), allowing the device to act as a host for connecting external devices.

Comparison of Micro USB, Mini-USB and USB-C

Compared to micro USB, mini USB is an older version of compact USB introduced in 2005. Mini USB is less frequently used because it lacks features and convenience compared to micro USB. Micro USB is superior to mini USB in terms of size, durability, and transfer speed.

Although micro USB has become the standard for most non-Apple devices, some new products are now transitioning to the more advanced USB-C interface. USB-C is a reversible connector that supports higher-speed data transfer and power output. It is becoming the new standard for most portable devices, including smartphones, tablets, and laptops.


Micro USB is a miniaturized USB interface developed for compact mobile devices. It is smaller than the standard USB and can be plugged in and out. Micro USB is used for a variety of applications, including powering and charging small devices, transferring data between devices, and more.

Need to know more about Micro USB cables?

At Romtronic, we have MFi, CE, and UL certifications, and a team of highly specialized electrical engineers and manufacturing technicians to produce a wide range of compliant Micro USB cable assemblies. So, if you are not sure which Micro USB cable is right for your application, just ask us.