V0603MHS12NH - 

Littelfuse Metal Oxide Varistors - MHS Series
Littelfuse MHS series of MOV's are transient surge suppressors that provide protection from ESD and EFT in high-speed data-line and other high frequency applications. The low capacitance of the MHS series permits usage in analog or digital circuits where it will not attenuate or distort the desired signal or data. The small size of the MHS series makes them ideal for high-density printed circuit boards, protecting integrated circuits and other sensitive components.