:The SOCAY 20D621K Varistor with Through Hole RoHS is a non-linear surface mount device designed for AC voltage surge and lightning strike protection. It has a maximum power dissipation rating of 125 watts and a maximum AC operating voltage rating of 150 volts. The SOCAY 20D621K Varistor is composed of a low-resistance metal oxide material that creates a non-linear electrical characteristics. This characteristics creates a voltage-dependent resistance that can absorb the surge energy and clip or suppress transient over voltages. The compact dielectric form factor provides a high voltage protection density, which provides ESD protection for a variety of digital, analog, and mixed-signal applications.