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Reference design & best practice – cable

Reference design & best practice – cable

We provide standard 1m length USB3.0 wire. If the length cannot meet the requirements, customers can make their own wires according to the following wire requirements or find a third-party supplier to provide wires that meet the specification requirements. The following are some basic requirements of USB3.0 wire:


  1. Signal line structure: in addition to the original power line and data line (D +, D-) of USB2.0, USB3.0 wire also adds four additional high-speed data channels to form a pair of SuperSpeed differential pairs (RX1 +/RX1-and TX +/TX-),Supports full duplex data transmission up to 5 Gbps.


  1. Materials and quality:

Conductor material should use high quality copper wire, such as oxygen-free copper, to ensure low resistance and signal transmission clarity.

Insulating materials should meet certain dielectric constant and dielectric loss to reduce signal attenuation and delay. Usually, materials with low dielectric constant (DK) are selected.

The shielding layer must be tight enough to reduce electromagnetic interference (EMI) and signal crosstalk, which usually includes one or two layers of metal foil shielding layer plus ground braided layer.

Wire color: the standard of USB3.0 wire requires that the internal SuperSpeed difference should be blue to distinguish the outer skin of the wire, which is a unique identification of usb3.0.


  1. Length limit:

The USB3.0 standard does not have a clear limit on the length of wires, but considering the influence of signal attenuation and noise, the length of cables recommend in practical engineering applications is usually less than 3 meters, which may affect the data transmission rate and stability.


  1. Interface compatibility:

The USB plugs at both ends of the wire shall conform to the USB 3.0 interface standard to ensure physical compatibility with the USB 3.0 device, and shall also be downcompatible with the USB 2.0 device.


  1. Electrical performance:

The wire shall undergo strict electrical performance tests, including signal integrity and consistency tests, to verify whether it meets various indicators required by USB3.0 specifications, such as signal eye diagrams, radiation, static electricity, etc.


Attachment USB cable reference design drawing


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