USB4
Universal Serial Bus 4, marketed as USB4 and sometimes referred to as USB 4.0, is a new technical specification of the Universal Serial Bus data connection standard, released on 29 August 2019 by the USB Implementers Forum.
| Type | USB | ||
|---|---|---|---|
| Production history | |||
| Designer | USB Promoter Group | ||
| Designed | 29 August 2019 | ||
| Superseded | USB 3.2 | ||
| Daisy chain | No | ||
| Audio signal | DisplayPort | ||
| Video signal | DisplayPort | ||
| Connector | USB-C | ||
| Electrical | |||
| Max. voltage | 48 V (PD 3.1) | ||
| Max. current | 5 A (PD) | ||
| Data | |||
| Data signal | Yes | ||
| Bitrate | 20 Gbit/s (optionally up to 120 Gbit/s) | ||
USB4 allows sharing a single, high-speed data link with multiple devices dynamically. USB4 devices must support 20 Gbit/s data transfer rates and, optionally, the rates of 40 Gbit/s (USB4 version 1.0), 80 Gbit/s (USB4 version 2.0), and 120Gbit/s. In contrast to prior USB protocol standards, USB4 mandates the exclusive use of the USB-C connector and USB Power Delivery specification.
USB4 architecture is based on USB 3.2 specification. It also incorporates elements of the Thunderbolt 3 protocol; however, interoperability with Thunderbolt 3 products is mandatory only on selected USB4 device types.