USB CABLES – NO, THEY ARE NOT ALL THE SAME!

〡 02 Jul, 2026
〡 by Robert Mony

USB CABLES – NO, THEY ARE NOT ALL THE SAME!

Deciding which type of USB^® cable to use will mainly depend on the smartphone you want to connect it with. One of the typical corollaries of USB cables you use is fast charging. However, there is no standardized standard in this area. Smartphone manufacturers have developed their own technology to meet the growing demand for fast charging, which, among other things, has made it difficult to adapt to the recent USB 3.1^® and more recent USB versions. Therefore, it is important to make sure that the USB cable you use will be a good quality cable and that it will meet your smartphone’s requirements. To help you make the right choices, we decided to create this light article by keeping our explanations simple while avoiding getting lost in too many technical details.

Not all USB cables are created equal. Choosing the right cable for each task is important because using the wrong cable can damage devices, slow down data transfer or again create intermittent communication issues between connected devices.

Do you have a certified cable or is it a generic cable?
What is its maximum capacity to recharge your battery?
What is the maximum throughput for data transfer?

Did you know that you can find on the market three different types of USB cables? (Confirm that your cable is doing the right task)

Basic battery charging cables
Data-only cables
Cables that handle both battery charging and data communication

Did you know that you need also to look at three different key features when selecting your USB cable, and that all of those are not necessarily tied to each other?

What is your need for the connectors?
What is your communication speed requirement?
What is your need for batterie charging capability?

USB connectors

USB connector formats can vary greatly depending on your devices, Micro-USB^®, Mini-USB^®, USB Type-A^®, USB, Type B^®, USB Type C^® or the Lightning^® connector that Apple^® used for many years until their most recent transition to the USB Type-C connector, which is now the industry standard for the most part, not to mention all the smartphones on the market.

To allow us a lighter text, we will focus our explanations in this article on the common formats used in the automotive industry, namely USB Type A, USB Type C, Apple Lightning, and micro-USB. Please note that, now in 2026, the majority of portable devices and units in the cars are now using the first two types of connectors.

The USB Type-C connector is the latest USB connector format introduced to the market, and it is the latter that offers the widest range of possibilities, but also the greatest confusion in the range of devices and cables. The latter was introduced at the same time as the USB 3.0 standard and is the only format to use the USB 4.0 standard.

The USB Type A connector is now several years old. The latter has received various evolutions and is still widely used for many devices that do not require the communication speeds or current capacity that USB Type C offers, but it nevertheless retains a very great asset, with its solid case very well suited for daily use on board the car. This connector is compatible with the very first USB 1.0 standards and has evolved to the USB 3.2 standard.

The Lightning connector, exclusive to certain Apple products, uses a special connector that integrates an electronic circuit inside the connector and acts as a rough translator between the USB communication (typically USB 2.0) and the Apple device. These cables are certified by Apple under the name MFi^TM Apple made the transition to the USB Type C connector with the introduction of the iPhone^® 15, Apple made the transition to the USB Type C connector.

The Micro-USB connector found on older Android^TM smartphones is under the USB 2.0 standard, and as Apple's Lightning connector, any recent Android smartphones are using a USB Type C connector.

USB communication speed

Over the years, USB communications and its associated speeds have evolved, bringing huge changes to theoretical bandwidth. This speed is named in Mb/s (megabits per second).

USB 2.0 (High Speed): Up to 480 Mbps
USB 3.0 / USB 3.1 Gen 1 / USB 3.2 Gen 1: Up to 5 Gbps (5120 Mbps)
USB 3.1 Gen 2 / USB 3.2 Gen 2: up to 10 Gbps (10240 Mbps)
USB 3.2 Gen 2x2: up to 20 Gbps (20480 Mbps)
USB4: Up to 40 Gbps (40960 Mbps)

For the vast majority of automotive devices and smartphones, the USB 2.0 and USB 3.0 standards are used. Due to the typical current use in the car as well as for the vast majority of smartphone manufacturers, consumers would have no interest in paying more for faster performance; the benefit would not be justifiable. To put USB speed in perspective,

USB 3.0 communication is about 4x the bandwidth of a 5th generation Wi-Fi^® hotspot (Wi-Fi 5)
USB 2.0 is showing more than 53x the bandwidth you will need for a 24bit/192KHz lossless audio file that is the best music you can download from Apple Music.

Depending on the connections between the devices, they will limit their communication speed with the weakest link. So, if a USB 3.0 device is connected with a USB 2.0 device, the maximum speed limit will be at the USB 2.0 level and therefore 480 Mbps.

USB current capability (battery charge)

The current capabilities of USB connections range from a simple 0.5A @ 5Vdc (USB 2.0) to a whopping 5A @ 48Vdc (delivering up to 240 Watts) via USB Power Delivery (USB-PD). A good charger and cable design will prevent overheating and possible damage to devices, especially to batteries, where heat is the worst enemy for batterie life.

Here are the main USB power and current standards;

USB 2.0: Supplied at the base 0.5A @ 5Vdc (2.5 Watts).
USB 3.x: Supplied at the base 0.9A @ 5Vdc (4.5 Watts).
BC 1.2 (USB Battery Charge) mention: Increases the maximum unconfigured current to 1.5A @ 5Vdc (7.5 Watts) – often referred to as Speed Charging when using USB Type A or Micro-USB.
USB Type C: The basic specification allows up to 3.0A @ 5Vdc (15 Watts) depending on the device.
USB-PD (Power Delivery) mention: Can negotiate with higher voltages that vary depending on the device (up to 48 V) as well as currents up to 5A for typical capacities of 60 Watts, 100 Watts and up to 240 Watts.

Why don't you see any USB-PD device with extreme charging capabilities, such as 240 Watts? Simply because we are in a car in which this type of load would be unnecessary, especially for long journeys. Keep in mind that the worst enemy of batteries is temperature. A battery does not charge below zero Celsius, and charging the battery very quickly also places it in conditions where it will heat up more than if it were charged more slowly. Do you really want this in the heat of summer when you get in the car?

Rea-life uses in the car

For our automotive application, USB cables perform a data transfer task between a third-party device (smartphone) as well as its battery charging when necessary. It is therefore a transmission conduit between two points. As the saying goes, the most efficient path is the shortest path, so the longer a cable is and uses lower quality materials, the more it will degrade the quality of data transmission, limit charging capabilities, or both of these. Each connection is roughly equivalent to a cable length of 3 feet, so it is essential to avoid long USB chains and, more importantly, to avoid going through an existing cable if you do not know its certification or quality!

As example, a 3-foot USB extension cable connected to a 3-foot smartphone USB cable will roughly be the same a using a 9-foot cable between the two devices, and not a 6-foot communication chain as most people will see it.

The use of a quality cable will therefore make it possible to optimize the transfer of the signal by its quality of construction, its structure, the materials used, the insulation of the connectors and the sheath of the cable as such. All of them will influence the signal transmission. Higher quality construction will also ensure a better connection and longer life. That is twice as important if you think about how often you will perform this connection on a weekly basis.

A very simple visual comparison would be to see your USB cable as a water supply conduit. The smaller it will be (cable quality), the more joints there will be (connectors) and the longer it will be, the more restrictive it will be. In addition, over time, deposits may settle in your pipe (oxidation of cables and connectors, induction generated by high-speed data) the more your pipe will be restrictive and therefore will decrease in capacity over time... hence the importance of having a good pipe with materials specifically designed for this environment. A cable in the comfort of a stable temperature/humidity home will not age the same as it will in the harsh environment that is your vehicle under the sun in summer or the cold winter time.

It's up to you to decide if you want a hassle-free and efficient USB communication or if you want to call your plumber soon!

Micro-USB^®, Mini-USB^®, USB Type-A^®, USB Type B^®, Type-C^®, USB 2.0^®, USB 3.0^®, USB 3.1^®, and USB logos are registered trademarks of USB Implementers Forum.

Lightning^®and Apple^®, MFi^TMand iPhone^® are trademark of Apple Inc., registered in the U.S. and other countries and regions.