600V CoolMOS™ S7 SJ Power MOSFETs Infineon Technologies 600V CoolMOS™ S7 SJ Power MOSFETs offer performance for low-frequency switching applications. CoolMOS™S7 has a low RDS(on) value foran HVSJ MOSFET. The device allows a distinctive increase in energy efficiency. CoolMOS™S7 is optimized for 'static switching' and high current applications.