Chander Planar cores are the best alternative to conventional ferrite cores when there is a need for a low-profile magnetic device. Their shape is suitable for PCB mounting and they have low losses and high saturation levels. ... morePlanar cores are the best alternative to conventional ferrite cores when there is a need for a low-profile magnetic device. Their shape is suitable for PCB mounting and they have low losses and high saturation levels. https://www.cosmoferrites.com/news-events/selecting-planar-cores-for-your-power-applications