Why ESD protection design for USB 3.0 ports?

Among the various ports, USB is the most widely used. Among them, the USB3.0 port is more popular for electronic products with high image quality and large-capacity storage requirements because of its high-speed transmission rate. The high transmission rate of USB3.0 is due to its use of more advanced processes to design and manufacture. But this also means that the USB3.0 control chip's ability to withstand ESD drops rapidly. Since USB3.0 is often used to transmit large-capacity audio and video data, it has higher requirements to prevent data packet loss. So,Therefore, it is very important to design ESD protection for USB 3.0 ports.

How to choose ESD electrostatic protection device for USB3.0 port?

The following conditions must be met at the same time:

1. Lower junction capacitance to ensure that the transfer rate of the USB3.0 port will not be affected.

2. the ESD device can withstand the impact of 8kV ESD in IEC 61000-4-2 contact mode.

3.The fast response speed can clamp the voltage within a reasonable range, so that no packet loss occurs during data transmission.

SOCAY Solution and Electronic Components

SOCAY has rich experience in ESD protection. The following circuit diagram is designed for USB3.0 electrostatic protection requirements.? This solution applies two different types of TVS diodes.

Transient suppression diode(TVS Diode )

TVS1【ULC3304P10】Vrwm：3.0V；Vb：4.0V；Vesd：30KV/30KV；Ct（f=1MHz）：0.5pF；Package: DFN2510P10

TVS2【ESD05V14T-LC】Vrwm：5.0V；Vb：6.0V；Vesd：8KV/15KV；Ct（f=1MHz）：1.2pF；Package: STO-143

We use two TVS DIODEs in the USB3.0 power cord of this solution for electrostatic voltage clamping. The junction capacitance of both TVS diodes is small, which meets the high-speed transmission of USB3.0. The response time of the TVS tube is ns level and the residual voltage is low.

Applications

SOCAY has over ten years of circuit protection technology and has a fully equipped EMC laboratory. The reliability of USB3.0 port ESD protection solution has been verified by simulation of real working environment and large amount of data. The solution can be used in various situations, such as:

1. Laptop, PAD, home desktop computer, industrial computer

2. Network printer

3. Set-top box

4. Mobile handheld devices

5. TV

6. Vehicle

7. Other devices with USB2.0 ports

8. DVD recorder