650V IH Series IGBTs STMicroelectronics 650V IH Series IGBTs offer high efficiency for induction heating systems and soft switching applications. The STMicroelectronics IGBTs belong to the STPOWER™ family that exceeds the HB series, currently used for induction heating applications. The 650V IH series ensures increased efficiency in final applications thanks to a lower VCE(sat) combined with very low turn-off energy. 40A and 50A devices are already available in TO-247 Long Leads packages, and 20A and 30A devices are being developed.