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USB-C or USB Type-C : What is USB-C?

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Apple’s new MacBook has a single USB Type-C port, but this is not an Apple-only standard. This is a new USB standard, and  given time  it will spread to everything that currently uses an older, larger USB connector.USB Type-C, commonly known as simply USB-C, is a 24-pin fully reversible-plug USB connector system allowing transport of data and energy.

USB Type-C is closely intertwined with other new standards, like USB 3.1 for faster speeds and USB Power Delivery for improved power-delivery over USB connections.

Type-C is a New Connector Shape

From desktop computers to smartphones, USB memory sticks to laptops, USB is the standard when it comes to connectivity. The last major update to the ever-evolving USB standard came in 2013 with USB 3.1, and that was accompanied by the introduction of the new USB-C connector. If anything, it could become the default connection standard for even more devices. Apple helped kick off the trend with the 12-inch MacBook that used a single USB-C socket to not just connect to all its peripherals, but also to provide power. More recently, the HTC 10 and LG G5 have incorporated USB-C into their designs, as well as the ill-fated Galaxy Note 7 and Google Pixel phones.

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The first thing to realize about USB-C is that it’s not a new USB standard in the same way as USB 1.1, USB 2.0, USB 3.0 or the very latest USB 3.1 are. Those upgrades focus on defining what the connection can do in terms of speed and feature improvements, whereas USB-C is all about the physical connection, like with microUSB and mini USB. The crucial difference here, though, is that unlike micro and miniUSB, USB-C is aimed at being a replacement for both ends of the cable.

USB Versions

To better understand what we mean about Type C being a replacement for both ends of the cable, you first need to understand the differences between the existing versions of USB and the various Type-A and Type-B connections.

USB versions refer to the overall standard and they define the maximum speed of the connection, the maximum power and much more besides. They theoretically could be applied to any shape of connector so long as the computer and device are connected up correctly.

USB 1.1

Although USB 1.0 is technically the first version of USB it never really made it to market so USB 1.1 is the first standard we all used. It could deliver data at 12Mbps and maximum current draw of 100mA.

USB 2.0

The second version of USB arrived in April 2000 and it provided a massive boost in maximum data throughput, up to 480Mbps. Power draw was also increased to a maximum of 1.8A at 2.5V.

USB 3.0

USB 3.0 was a big change as it brought new connector types to allow for its extra speed and power draw, with them often colored blue to denote their prowess. USB 3.0 can run at up to 5Gbps, delivering 5V at 1.8A. It arrived in November 2008.

USB 3.1

The latest and greatest version of USB was released in July 2013, though uptake is still almost non-existent. It can deliver 10Gbps of throughput while up to 2A can be drawn over 5V, and optionally either 5A over 12V (60W) or 20V (100W). This is the reason the new MacBook can be powered just by its USB connection.

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USB-C

This brings us to USB-C. Where Type-A and Type-B have had to work within the framework of being backwards compatible, Type-C is intended to replace both and is designed to be small enough to not need any mini or micro variants. The intention is that it will completely replace all types of USB on both host and client devices.

What’s more its headline feature is of course that it’s reversible. This means you no longer have to get the plug the right way round – or even the cable the right way round but instead, like Apple’s Lightning connection, it’ll work whichever direction you try no more USB superposition.

To enable this USB-C cables actually require circuitry to tell which way round they are and route power and data in the right way, just like on Apple’s Lightning connection. This is unlike all existing USB standards which are just ‘dumb’ cables.

USB-C also builds on the new USB 3.1 standard so to all intents and purposes is the connection type that brings in the new power and speed advantages of USB 3.1. USB-C is still backwards compatible with existing USB variants, but that of course requires adapters.

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