“USB” or Universal Serial Bus is a standard that was created as a means to make connectors more universal and transparent. USB C is a specific shape of USB connector
and was designed to take that universality a step further by being the one connector for almost anything including data, power/charging, video and audio. The connector is also reversible, it has no up or down orientation! While USB C does make some things a lot easier, there is also lots of confusion and uncertainty surrounding it. Are all USB C cables the same? (No). What can USB C do that older USB cable types can’t? (A lot more but it also depends
on the cable). Can a USB C cable damage hardware? (Potentially). USB C can be tricky but much of the confusion is hopefully cleared up in the following pages. If you need USB C info in a jiff, we got you covered. When in USB C doubt, check this graphic out! (Click to embiggen)
USB C cables and hubs for purchaseThese three items will fill most USB C related cable needs. Additionally, all of the following parts have the required USB C specifications and certifications including implemented safeguards for protecting cables and ports. "Full-featured" USB C to USB C cable This cable is best for charging USB C devices as well as data transfer. It is NOT meant to be used as a DisplayPort or to connect any other type of display receptacle. The cable includes an EMARK chip, required by the USB C specification (but sometimes left out). That means you can use this for high current (5A) charging. As technology changes and adapts, so does Adafruit! Rather than the regular USB A, this cable has USB C to USB C plugs!USB C is the latest... Thunderbolt 3 USB C cable This cable can be used for DisplayPort. Which means it can be used with other monitors as display receptacles. Additionally it contains all the same features the above "Full-featured" USB C cable has. USB C Adapter Hub The current downside of USB C is that, quite often, newer computers have only USB C ports. This means with older cables and devices you'll often need an apter to connect to the usb ports. This adapter hub is great for those situations. USB C refers solely the shape of a 24 pin connector which can be either a plug or receptacle. The connector has more pins than past USB shapes (like A and micro B) so it can charge devices and transfer your data incredibly quickly. The main purpose that USB C was created for was to do away with all the various cables and adapters to make a more universal solution for both charging and data transfer.
image source: USB C wikipedia page What is it not?As mentioned earlier, USB C refers to the shape of a 24 pin connector. Just because a cable is USB C doesn’t mean it supports a specific power, transfer speed or protocol. For example, if a cable is USB C it could be USB 3.1 (fast data transfer), 2.0 (slower data transfer) or a different specification. How is it different from other USB cables?
The USB C advantageWhat can USB C do?A USB C cable has the potential to hold some or more of these features:
Again, these features are cable specific, meaning any given USB C cable may not have some of these features. On the other hand, the vast majority of cables can transfer data and charge devices. The next section will cover the many different USB C cable types and how to select a cable to use for specific features. USB C cables can have variations in speed, power, and protocol capabilities. Additionally there are different length requirements to watch out for. When in doubt, buy cables from the device manufacturer. You can also buy USB C cables from Adafruit as we have specific cables for specific needs that are all tested and researched.
SpeedA USB C cable with 3.1 Gen 2 capabilities vs one with 2.0 can mean a vast difference in data transfer. For example, two cable types transferring the same HD movie can take vastly different times:
USB C cables run at different speeds measured in bits per second. These include:
image source: USB C wikipedia page If you run across the term “Full-featured” this a reference to speed and typically means USB 3.1 Gen 2.
PowerAll USB-C cables must be able to carry a minimum of 20V 3A, but can also carry high-power 20V 5A current. For cables with up to 3A and 5A delivery, they can be used for
The biggest difference between 3A and 5A cables is 5A cables can generally power laptops and monitors while 3A cables cannot. Always double check a cable's capabilities before using to power laptops or monitors NEVER USE A CHEAP CABLE TO CHARGE YOUR COMPUTER *NEVER USE A 3A USB C CABLE TO POWER A LAPTOP OR MONITOR*
Thunderbolt 3 USB C compatible ports. image: https://en.wikipedia.org/wiki/Thunderbolt_(interface) Protocols / Alternate Modes:Different USB C cables may support different protocols, or ways of transferring data, such as MHL, HDMI, Thunderbolt 3 and DisplayPort. In relation to USB C, these protocols are called alternate modes. Having support for one protocol type may give support for another but this is not generally the case. MHL (Mobile High-Definition)
MHL Alternate Mode USB Type C pin mapping. image: https://en.wikipedia.org/wiki/Mobile_High-Definition_Link#USB_Type-C_(MHL_Alternate_Mode) HDMI
Thunderbolt 3
DisplayPort
LengthIn general, the faster the speed of a USB cable, the shorter it should be due to the electrical characteristics inherent to high speed data transfer. Here are the different cable speeds and corresponding suggested lengths: USB 2.0
USB 3.1 Gen 1
USB 3.1 Gen 2
image source: https://www.usb.org/documents Thunderbolt 3 cables
Many new laptops, such as the Macbook Pro, have only USB C ports. If you’re trying to connect any non-USB C device like USB 3.1, HDMI or Thunderbolt, you’ll need an adapter.
Legacy Adapters: Connecting an older device to a host with a USB C receptacle requires a cable or adapter with a USB A or USB B plug or receptacle at one end and a USB C plug at the other. Legacy adapters (i.e. adapters with a USB A or USB B plug) with a USB C receptacle are "not defined or allowed" by the specification since they can create "many invalid and potentially unsafe" cable combinations. Audio Adapter Accessory ModeA device with a USB C port may support analog headsets through an audio adapter with a 3.5 mm jack, providing four standard analog audio connections (Left, Right, Microphone, and Ground). The audio adapter may optionally include a USB C charge-through port to allow 500 mA device charging. Alternate ModesAlternate Mode hosts and sinks can be connected with either regular full-featured USB C cables, or converter cables/adapters: USB 3.1 Type C to Type C full-featured cable
Thunderbolt Type C to Type C active cable
USB 3.1 Type C adapter cable (plug) or adapter (socket)
Image from USB C wikipedia page Power cautionThe amount of power that cables may deliver can differ for different devices. For example: If you use a cable that draws more power than a port can handle, you could harm the port. Cables are supposed to contain safeguards. Sometimes manufacturers cut corners to reduce cost and don’t follow standards, including the implementation of these safeguards. Cables which are not compliant can cause serious damage Buying Cables Online
If buying inexpensive cables, BE VERY CAREFUL AND LOOK FOR CERTIFICATIONS AND REVIEWS Connecting to Monitors and laptops
NEVER USE A CHEAP CABLE TO CHARGE YOUR COMPUTER *NEVER USE A 3A USB C CABLE TO POWER A LAPTOP OR MONITOR* Identifying your cableIf you are still unsure of what kind of USB C cable you have after looking for product specifications and checking comments on the product page, look for one of the below symbols on the cable to identify the cable type. Even if you are correctly able to identify the cable, never use a cable to power a laptop or monitor unless you are certain the cable supports 5A and you have double checked online resources about the specific cable you are using.
image: USB C wikipedia page Label your cables!
Power
Display
Buying cables
When in USB C doubt, check this graphic out!
By taking these precautions, you save yourself stress and avoid damaging your hardware and ports. Good luck with your connector adventures! This guide was first published on Nov 27, 2019. It was last updated on Nov 27, 2019. Is USB 3.2 Gen 2 typeOne thing you need not worry about is a newer USB product not working with an older device. USB 3.2 devices are backwards compatible with all existing USB products. What you'll sacrifice is throughput; two products with different USB capabilities will operate at the older's transfer speed.
Which USB connector is reversible?USB Type-C is termed “universal” as it is reversible (while the Type-A is unsymmetrical and polarized). The USB 3.1 standard is backward-compatible with USB 2.0 and USB 3.0.
What is A USB 3.2 Gen 2 port?USB 3.2 Gen 2x2 is a multi-lane operation for new hosts and devices, allowing for up to two lanes of 10 Gbps operation to realize a theoretical 20Gbps data transfer rate.
Is USB 3.2 Gen 2 the same as TypeFor example, while the USB 3.2 Gen 2 (previously USB 3.1 Gen 2) specification supports 10 Gbps communication rates and USB Type C connectors are designed for signal integrity at and beyond those speeds, the length of the cable and quality of the cable construction can both be a factor in limiting communication ...
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