RoHS Compliant SO-9001:2000 TS-16949:2002 ISO-14001:2004. RS Pro Surface Mount Toroidal Inductors 10uf-220uf. RS Pro Surface mount toroidal inductors are excellent for filtering high frequency signals while supporting a substantial DC Current. These SMD inductors can be used in applications where energy storage is required for storage of a highly stable inductance when a rapid change in current occurs. The RS Pro chokes have an operating frequency to 1 MHz and include high energy storage with low saturation.. Applications. Common mode filter DC-DC convertors Step up, step down Filtering battery powered equipment Inverting or dual output