Toroidal Common Mode Inductors 

Toroidal Common Mode Inductors Features Pure copper wire winding High stability life time High immunity to interference High initial permeability (this is the basic requirement for common mode inductors), high saturation magnetic inductance, temperature stability compared to ferrite (which can be interpreted as a small temperature rise), and more flexible frequency characteristics, as high permeability, very small can make a large inductance and adapt to a wide range of frequencies.