ferrite core

One of the cores frequently used in transformers and choke coils for switching power supplies. The most commonly used ferrite is spinel ferrite, represented by the molecular formula MO·Fe2O3 (M is a divalent metal). Spinel ferrite cores are produced by putting powdered metal oxides into a mold, forming them, and firing them in a kiln. To increase the saturation magnetic flux density, spinel ferrites are often made by mixing multiple metal materials and are called composite ferrites.

Ferrite cores are suitable for output transformers and transformers with large current changes because they have the advantage of low iron losses even when magnetic flux density varies greatly in the high-frequency range. On the other hand, they have the disadvantage of a lower saturation magnetic flux density compared to metal-based cores.

In addition, a core attached to a DC cable as an EMI countermeasure (noise prevention) for an AC/DC Power Adapters — Desktop & Wall-Mount is also called a ferrite core.