Optimized superjunction MOSFETs merging high energy efficiency with ease-of-use The 600V CoolMOS™ P7 superjunction (SJ) MOSFET is the successor to the 600V CoolMOS™ P6 series. It continues to balance the need for high efficiency against the ease-of-use in the design process. The best-in-class R onxA and the inherently low gate charge (Q G) of the CoolMOS™ 7th generation platform ensure its high efficiency.