USB 4.0

The USB Implementers Forum has announced the publication of USB4! The specification is available to download now as part of the document library of

USB Implementers Forum Announces the Publication of Its Thunderbolt 3-Based USB4 Standard article tells that USB 4 offers up to 40Gb/s throughput, PCI Express, and DisplayPort connectivity — plus compatibility back to USB 2.0.

USB4 is built around Intel’s Thunderbolt connectivity standard, which incorporates PCI Express and DisplayPort plus power delivery connectivity in a single cable.

USB4 is promised to be be fully backwards compatible with previous USB devices from the current top-end USB 3.2 Gen 2×2 standard down to USB 2.0 (though not now very rarely used USB 1.0). USB4 will be compatible with existing USB Type-C cables.


  1. Tomi Engdahl says:

    Thunderbolt 4 arrives in 2020, but USB will remain the king of PC ports

    USB 4 will transfer data just as swiftly, but Intel promises other innovations for Thunderbolt.

  2. Tomi Engdahl says:

    USB4™ Specification

    NOTE: Adopters may only use this USB specification to implement USB or third party
    functionality as expressly described in this Specification; all other uses are prohibited.

    LIMITED COPYRIGHT LICENSE: The Promoters grant a conditional copyright license under the
    copyrights embodied in this USB Specification to use and reproduce the Specification for the
    sole purpose of, and solely to the extent necessary for, evaluating whether to implement
    the Specification in products that would comply with the specification.

  3. Tomi Engdahl says:

    Tx/Rx test software tackles USB4

    QPHY-USB4-TX-RX electrical transmitter and receiver compliance test software from Teledyne LeCroy automates USB4 physical-layer testing. The software teams with the company’s LabMaster 10 Zi-A and WaveMaster/SDA 8 Zi oscilloscopes, as well as Anritsu’s SQA-R MP1900 bit error rate tester (BERT), to form a complete USB4 electrical test system.


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