The Littelfuse 20KPA30CA-B is a TVS diode Hi-Power Diode Axial that serves as an Electrostatic Discharge (ESD) suppressor. It is designed to provide protection against the effects of electrostatic discharge, which is the sudden release of electric charge from an object. This product features ultra low capacitance, high peak pulse power, and fast response times to protect sensitive components from damage caused by ESD. It is rated for a maximum peak pulse current of 30A, a clamping voltage of 20kV, and a capacitance of 18pF. The product is well-suited for applications requiring protection from static electricity, including telecommunications devices, consumer electronics, and automotive industries.