To find the right ESD protection device for an application, various criteria must be taken into consideration. It is important to find the right package for the application. How much PCB space is available? Does the customer need leaded or leadless package? Are side-wettable flanks for automatic optical inspection needed? Besides optical requirements, the electrical performance is critical too. Here, the breakdown voltage as well as the clamping voltage and parasitic capacitance narrow down which product range is suitable for the target application. In general, the lower the clamping voltage the better as this reduces the stress for the passive components, common mode termination, and PHY.