Fair-rite allocates some of its closed loop ferrite products to two different categories:
- inductive; and
- suppression.
Sometimes the same dimensioned cores are available in both categories with different part numbers and possibly different prices, implying some real difference in behavior, eg 5943003801 and 2643803802 are both FT240-43 sized cores.
Material datasheets often contain a note like this from the #43 datasheet:
Characteristic curves are measured on standard Toroids (18/10/6 mm) at 25°C and 10 kHz unless otherwise indicated. Impedance characteristics are measured on standard shield beads (3.5/1.3/6.0 mm) unless otherwise indicated.
I sought to clarify my interpretation of this clause by asking Fair-rite …whether the published material permeability curves / tables apply to suppression product. Can I use the published permeability curves / tables to predict inductor impedance reliably for suppression products?
Fair-rite’s Michael Arasim advised… Continue reading Using complex permeability to design with Fair-rite suppression products