RClamp0552T RailClamp ESD Protection Devices Semtech RClamp0552T RailClamp ESD Protection Devices are ultra low capacitance <,0.4pF TVS Arrays designed for high-speed data interfaces. The ESD devices can replace 0201 size multilayer varistors (MLVs) in portable applications such as smartphones, notebook computers, and other portable electronics. The RClamp0552T offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage, and no device degradation.