USB4 ESD Device Offers Protection Along With Performance

By Sharad Bhowmick

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PESD2V8Y1BSF and PESD4V0Y1BCSF from Nexperia are Electrostatic Discharge (ESD) protection devices optimized for use with retimers and redrivers on high-speed data lines. Retimers and redrivers are commonly used in the design of high-speed USB4 interfaces. However, these result in shorter board traces which have a lower parasitic inductance, an unintended consequence of which is a reduction in the overall system-level ESD robustness. The PESD2V8Y1BSF is designed to protect USB4 (Thunderbolt) interfaces, whereas, PESD4V0Y1BCSF can protect both the USB4 as well as the HDMI 2.1 interface. The component employs Nexperia’s TrEOS technology, which combines low clamping with low capacitance and high robustness. Both the devices offer a backward compatibility

According to the company, the PESD2V8Y1BSF and PESD4V0Y1BCSF can be placed immediately next to the device which is to be protected, this enables the devices to offer greater design flexibility compared to most other ESD protection devices, moreover, the AC coupling capacitance is protected as well. On top, it places most of the line inductance between ESD protection and protected device to optimize system ESD performance.

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“Nexperia enables design engineers to meet tight budgets on both insertion and return loss for high speed USB4 data lines by providing devices that minimize the impact of ESD protection on overall system budget,” says Stefan Seider, senior product manager at Nexperia. “These devices offer the optimum balance between optimizing system-level ESD robustness and RF performance.”

The company claims that in order to maintain backward compatibility with older interface standards like USB3.2, which can be connected over USB Type-C, the PESD2V8Y1BSF has a reverse standoff voltage, VRWM = 2.8 V, while the PESD4V0Y1BCSF has a VRWM = 4 V making it suitable for HDMI 2.1 as well. The RF performance of the TrEOS technology used for both devices does not degrade over the operating voltage range. Apart from USB4 and HDMI 2.1, both parts can also be used to protect PCIe or DisplayPort interfaces.


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