USB 2.0 vs USB 3.0: The Key Differences Explained
The Universal Serial Bus (USB) was developed as a standard to define communication protocols between computers and electronic devices. USB refers both to the USB ports and cables with USB connectors. They are most frequently used in 2021 as charging cables for smartphones and tablets, but their primary purpose is for data transfer between computers, smartphones, and tablets to accessories like controllers, keyboards, printers, and scanners.
Of course, the amount devices made to be used with a computer has grown immensely since the concept was first introduced. Every industry in the known world has found innumerable uses for USB connections. Where there’s a specialized piece of equipment, there’s usually a USB connection to manage it through a computer interface.
Like any technology, the USB design has not stood still. The original line of USB 1.0 ports is hard to find, but USB 2.0 and USB 3.0 are found nearly everywhere. On desktops, you can identify a type-A USB port, the traditional rectangle USB port shape, by its color. Grey usually stands for USB 2.0. Blue usually means it is a USB 3.0. The color isn’t the only difference.
USB 3.0 is an advanced form of USB 2.0 with a faster transfer rate. USB 2.0 ports are only able to reach a 480 Mbps transfer rate even over short, efficient connector wires. 3.0 can reach speeds over ten times faster at 4.8 Gbit/s. This is due to four extra connector wires inside a USB cable. These extra connections allow more data bandwidth, but also allow for signals to be sent and received simultaneously.
The modern consumer is likely to associate USB 3.0 with the Type-C form factor and “fast-charging”. The massive bandwidth allows tablets, smartphones, and other electronics to pull a higher amount of power from the wall. The transfer rate of 4.8 Gbit/s is so fast that the cable can be used as a replacement for high-definition display cables and still allow for power throughput and extra device interaction. This is evident in devices like mobile touch-screen displays with USB C connections or portable VR headsets like Oculus(excuse me, Meta) Quest 2.
USB 2.0 vs USB 3.0 Side by Side Comparison
|USB 2.0||USB 3.0|
|What it is||data transfer port||data transfer port|
|Primary use||data transfer and device charger||data transfer and device charging|
|Name||universal serial bus 2.0||universal serial bus 3.0|
|Initial Release||April 2000||November 2008|
|Technologies Influenced||USB 3.0, USB 3.1, USB C||USB 3.1, USB C|
|Comparison Chart||USB 2.0||USB 3.0|
|Speed||480 Mbps (megabits per second)||4.8 Gbps (Gigabits per second)|
|Signaling Method||polling mechanism, can send or receive data||asynchronous mechanism, can send and receive data simultaneously|
|Price||Cheaper than 3.0||More expensive than 2.0|
|Max Cable Length||5 meters||3 meters|
|Power Usage||up to 500 mA||up to 900 mA|
|Number of wires in the cable||4||9|
|Standard-A Connection Colors||Grey||Blue|
What is the USB?
The Universal Serial Bus is the standard male-female connection system used to allow computing peripherals, accessories, and even other computers to talk to each other. Put simply, they allow data transfer to occur from one device to another. It was originally designed to help connect office devices like scanners and printers to either office computers or home computers. The use of the USB port and USB cables has far surpassed its original purpose. Now, USB ports and cables can be seen on nearly every electronic device with rechargeable batteries or the need to transfer data like video from a hunting camera.
The Types of USB
USB can be confusing at first. There are three different shape types of USB adapters and two active versions. There are also “mini” variations to some port types that act as adapters for devices with limited surface space for ports.
The three main types of USB are:
- Type-A: This is the traditional rectangle USB shape.
- Type-B: This type is shaped more like a square with the corner cut off. It is a slightly higher bandwidth port connection commonly used for printers and scanners.
- Type-C: C is the new standard for USB. It has no right side, which means it can’t be inserted into a device the wrong way. It also has the fastest capabilities and is often used for high-end features like Thunderbolt, fast-charging, and smart HUB connections.
- USB 1.1 – Released in 1998, 1.1 was only able to transfer 12Mbps with a max power output of 2.5V, 500 MA.
- USB 2.0 – Released in 2000, 2.0 increased transfer rate to 480 Mbps with a max power output of 2.5V, 1.8A.
- USB 3.0 – Released in 2008, 3.0’s transfer rate is 4.8 Gbit/s with a max power output of 5V, 1.8A.
- USB 3.1 – Released in 2015, 3.1 has a transfer rate of 10 Gbit/s with a max power output of 20V, 5A.
- USB Mini A – Mini A is a small boat-shaped port meant for smaller devices.
- USB Mini B – Mini B was the next attempt at fast and small USB connection, this port was used for the PS3 controllers.
- USB Micro A – Micro-A was more and even smaller than the Mini A.
- USB Micro B – Micro B was once a standard charge/data transfer connection for early smartphones.
USB 2.0 vs USB 3.0: 10 Must Know Facts
- USB 2.0 and USB 3.0 Type-A connections can be swapped. However, 3.0 features will not be fully functional in a USB 2.0 port, while 2.0 will work perfectly in a 3.0 port.
- USB cable adapters can be used to allow your USB cables to be compatible with more devices.
- USB 3.0’s transfer rate is ten times faster than USB 2.0
- Modern desktop setups often come with both USB 2.0 and USB 3.0 ports. They sometimes even include USB 3.1 Type-C ports as well.
- Type-A ports can be either USB 2.0, USB 3.0, or USB 3.1.
- Older USB connections can connect to new USB ports.
- USB cables are interchangeable as long as the ports are the correct type for the device and support the correct version of USB for the device’s features.
- USB ports are often exposed and should be kept away from potential obstructions. USB-C ports can be made to be Waterproof and are more resistant.
- Type-A ports for both USB 2.0 and 3.0 can be damaged if the cable adapter is placed in the port incorrectly. If the adapter won’t go in easy, do not force it.
- USB are replaceable. In handheld produces, this has to be done with some dismantling and soldiering. In a desktop computer, USB ports can be removed or added at will provided the motherboard has support for extra slots.