
However, USB 4 is still limited to its maximum data rate as defined in the standard.
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The Thunderbolt protocol combines PCIe and DisplayPort into two serial signals and provides these protocols over a USB-C connection. If you’re planning to add Thunderbolt to your next design, take a look at our overview of Thunderbolt design to help you get started. In addition, there is the matter of choosing a device topology to extend data and power out to peripherals. Although Thunderbolt products use a USB-C connector, the design constraints on Thunderbolt design are more stringent due to the higher data rate. The next generation of Thunderbolt 4 devices is starting to hit the shelves, and product designers can add high speed communication with major computer peripherals using the Thunderbird 3 or 4 protocols. Thunderbolt 3 devices provide bidirectional data transfer rates reaching up to 40 Gbps, a massive improvement over USB 3.1 Gen 2 data transfer at 10 Gbps.
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Today, Although originally a proprietary protocol which required a license and royalty to use in new products, Intel announced that the Thunderbolt 3 and later protocols would be royalty-free to OEMs and IC manufacturers with the goal of boosting adoption of the protocol.

The Thunderbolt protocol was originally developed by Intel in collaboration with Apple and released in February 2011, and the protocol has evolved to be compatible with USB-C.

the list of applications for Thunderbolt 3 and 4 designs goes on. High resolution displays, external GPUs, super-fast external storage, 10G Ethernet adapters.
