Science

Nexperia’s USB4 ESD Devices Offer the Optimal Balance of Protection and Performance – Hardware

(excerpt from the press release)

Nijmegen, The Netherlands, June 15, 2022: Semiconductor device experts Nexperia introduces two Electrostatic Discharge (ESD) protection devices designed for use with re-timers and re-drivers on high-speed data lines. The PESD2V8Y1BSF protects USB4/Thunderbolt interfaces; the PESD4V0Y1BCSF protects USB4 and HDMI 2.1. The devices are based on Nexperia’s TrEOS technology, which combines the lowest clamping voltage with the lowest capacitance and high robustness.

Re-timers and re-drivers are often used in fast USB4 interfaces. However, this leads to shorter traces on the board, which reduces the parasitic inductance between ESD protection and the system, which in turn unintentionally leads to less ESD robustness at the system level. The PESD2V8Y1BSF and PESD4V0Y1BCSF offer low vfTLP (very fast Transmission Line Pulse) peak clamping voltages that are even lower than USB4 protection devices with no visible trigger voltage in the standard I(U)-TLP curve. This helps to compensate for the lower inductance between the protection device and the re-timer, increasing overall system-level ESD robustness. To meet tight budgets for insertion and return loss, the protection devices are designed for very low insertion loss (-0.29 dB at 10 GHz) and return loss (-20.6 dB at 10 GHz). Unlike other solutions, the capacitance does not increase with the operating voltage and offers full high-frequency performance up to the maximum operating voltage.

The PESD2V8Y1BSF and PESD4V0Y1BCSF offer more design flexibility than other ESD protection devices because they can be positioned immediately behind the device socket. This also protects the AC coupling capacitance. In addition, most of the line inductance is placed between the ESD protection and the protected component to optimize the ESD performance of the system. “Nexperia enables developers to meet tight budgets for insertion and return loss in USB4 high-speed data lines by providing components that minimize the impact of ESD protection on the overall system budget,” said Stefan Seider, Senior Product Manager at Nexperia. “Our protection devices provide an optimal balance between system-level ESD robustness optimization and RF performance.”

To maintain backwards compatibility with older interface standards such as USB3.2 connected via USB-C, the PESD2V8Y1BSF has a maximum working voltage (VRWM; Reverse Working Maximum Voltage) of 2.8 V; while the PESD4V0Y1BCSF has a VRWM of 4 V and is therefore also suitable for HDMI 2.1. The RF performance of the TrEOS technology of both protection devices does not degrade over the operating voltage range. In addition to USB4 and HDMI 2.1, both components can also be used to protect PCIe or DisplayPort interfaces.


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