Other features are lower power loss and fewer external parts required for noise suppression in devices which have small motors.

There are three new models in the R60xxRNx series which have been added the Rohm's PrestoMOS portfolio of 600V super junction MOSFETs. They are optimised for driving small motors in refrigerators, ventilation fans, and other applications where noise suppression is a consideration.

Greater energy efficiency in equipment is required due to energy concerns and motor drives account for up to 50% of the world’s total power demand. High efficiency MOSFETs are therefore increasingly being used in inverter circuits that convert power to drive motors. MOSFET operation can generate noise, however, which can be address by adding components and/or changing circuit patterns.

The PrestoMOS Super Junction MOSFETs feature the industry's fastest reverse recovery time(trr) characteristics, claims Rohm, to receive high marks for achieving lower power consumption. The three new models are claimed to provide best-in-class noise characteristics while maintaining the fast trr through an optimised structure.

The R60xxRNx series maintains the high-speed trr characteristics of PrestoMOS while minimising noise. A reverse recovery time of 40ns is achieved by improving conventional lifetime control technology, reducing switching losses by approximately 30% over general products to lower application power loss. The super junction structure reduces noise characteristics (which are inversely related to faster trr) by about 15dB compared to standard products says Rohm (under measurement conditions at 40MHz). 

Typical applications are refrigerators, ventilation fans and fan motors and any devices equipped with small motors, says the company.