CoolMOS™ Power Transistors Infineon CoolMOS™ Power Transistors use the revolutionary CoolMOS™ technology for high voltage power MOSFETs, designed according to the superjunction (SJ) principle and pioneered by Infineon. CoolMOS™ C6 and E6 power transistor series combine the experience of the leading SJ MOSFET supplier with high-class innovation. The resulting devices provide all the benefits of a fast switching SJ MOSFET while not sacrificing ease of use. Extremely low switching and conduction losses make switching applications even more efficient, more compact, lighter, and cooler.