A common and straightforward way to identify USB types, particularly their version, is by looking at the color of the inner plastic part of the connector or port.
Identifying USB Versions by Color
The color coding of the plastic insert within a USB port or connector is a widely used visual indicator of the USB standard it supports. This method allows for quick identification of the potential speed and capabilities of the connection.
According to StarTech.com's "Ultimate Guide to USB Cables" referenced by RS Components, this color coding is a common practice:
A common way to identify the USB version is to see what colour the inner plastic part of the connection is. White indicates USB 1.0, black USB 2.0, and a blue USB port is USB 3.0.
Here is a breakdown of the common color codes and the USB versions they typically represent:
| Color | USB Version | Typical Speed | Key Characteristics |
|---|---|---|---|
| White | USB 1.0 (and often 1.1) | Up to 12 Mbps | Original standard |
| Black | USB 2.0 | Up to 480 Mbps | High-Speed USB |
| Blue | USB 3.0 (or USB 3.1 Gen 1 / USB 3.2 Gen 1) | Up to 5 Gbps | SuperSpeed USB |
| Teal or Green | USB 3.1 Gen 2 (or USB 3.2 Gen 2) | Up to 10 Gbps | SuperSpeed+ USB |
| Red or Orange | USB 3.2 Gen 2x2 or Charging Ports | Up to 20 Gbps (for 3.2 Gen 2x2) | High-speed or dedicated charging ports (often denoted with a lightning bolt or battery icon) |
Practical Identification Tips
- Examine the Port/Connector: Look closely at the receptacle on your computer, device, or charger, or the plug on your cable.
- Note the Color: The color of the plastic piece inside the metal housing is the key indicator.
- Match the Color: Use the table above to match the color to the corresponding USB version.
While color is a very common indicator, especially for USB-A ports, it's worth noting that this isn't an official standard enforced by the USB Implementers Forum (USB-IF) for all port types or generations. However, it is widely adopted by manufacturers, particularly for distinguishing USB 2.0 (black) from USB 3.x (blue or teal) ports.
For modern USB-C ports, color coding is less common due to the reversible design and complexity. In such cases, you might need to look for logos printed near the port or consult the device's documentation to identify supported USB standards (e.g., USB 3.2, Thunderbolt 4, etc.). However, for older and widespread USB-A ports, color remains a reliable visual cue.
Using the color of the plastic insert is a practical first step in identifying the likely USB version of a port or cable.
