Ferrite components eliminate electronic noise by acting as passive low-pass filters that choke high-frequency electromagnetic interference (EMI) and convert it into harmless heat. They are composed of a non-conductive, ferrimagnetic ceramic compound made from iron oxide mixed with manganese-zinc or nickel-zinc oxides. Because they present very low impedance to direct current (DC) and low-frequency signals but high impedance to high-frequency noise, they allow desired currents to pass while suppressing unwanted interference. How Ferrites Eliminate Noise
Ferrite components use two distinct phases of physics—reflection and dissipation—to tackle high-frequency noise: Components—Part 2: Chip Beads Reflect and Absorb Noise
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