Profile: S D A (Magnetics) Ltd. specializes in offering toroidal powder cores for inductors, filters and transformers. MPP toroidal cores are manufactured from an alloy powder comprising 80 percent nickel, 2 percent molybdenum and the balance iron, utilizing distributed air gap technology. The alloy powder is produced by means of mechanical or chemical atomisation, prior to being mixed in an aqueous process with inorganic silicates and oxides so that each particle is coated with a layer to prevent electrical contact during and subsequent to the compacting process. The powder is dried and stored in a controlled atmosphere. It is used in low & band pass filters, SMPS transformers, loading coils and RFI filters.