3E65 Datasheet, PDF (6/8 Pages) Ferroxcube International Holding B.V. – Medium permeability High Curie Temperature High Saturation Flux Superior EMI ferrite material

Impedance Performance
Inductive components and in particular ferrites exhibit ideal
properties to attenuate EMI: their impedance increases with
frequency and becomes resistive when µ’’, the complex
component of ferrite magnetic permeability, is predominant
over µ’.
The common mode choke impedance per line can be
estimated by the following formula:
Ae: core effective area, le: core effective length, f: frequency,
N: number of turns per line, µ0: vacuum permeability,
µ’ and µ’’: real and complex material permeability.
This formula gives a rough estimation because the parasitic
capacitance between windings has strong impact on the high
frequency performance.
The plot on the right shows typical performance curves
for TX25/15/10-3E65 (25 mm outer diameter, 15 inner, 10
height) wound with different number of turns.
The following plots compare the performance of 3E65 on different sizes with a market standard medium
permeability material:
3E65
Optimized for use in wideband transformers
as well as EMI-suppression filters