In September 2019,the USB Implementers Forum (USB-IF) announced the publication of the USB4 specification. Offering backward compatibility with USB 3.2, USB 2.0 and Thunderbolt 3, the new specification utilizes the USB Type-C® connector but doubles the bandwidth to extend Type-C performance.
With the USB4 specification comes a new underlying protocol that allows connections to scale to the best mutual capability of connected devices. For example, it can scale allocations for display data flow given USB Type-C has evolved into the external display port for many host products. It can also help optimize performance for older devices. However, this means the new protocol includes some changes that have consequences for the selection of ESD protection components.
Key characteristics of USB4 include:
1.Two-lane operation using USB Type-C cables and up to 40 Gbps data transmission over certified cables
2.Multiple data and display protocols that efficiently share the maximum aggregate bandwidth
3.Backward compatibility with USB 3.2, USB 2.0 and Thunderbolt 3
4.Supports USB Power Delivery specification