Ferrites & Ferrite Cores

When designing electronic equipment, controlling electromagnetic interference (EMI) is essential to protect both internal components and external devices from damage caused by high-frequency noise. In transmission systems, noise is categorized into two types: differential mode noise and common mode noise. Common mode noise is an unwanted signal that carries no useful information. Ferrite cable cores are specifically designed to suppress common mode noise generated in signal lines or power cables.

Interpower offers ferrites made from permeable materials that effectively reduce unwanted EMI from entering or exiting equipment via power cords or cord sets. These ferrites feature medium permeability and high resistive impedance, targeting noise suppression in the 30 to 300 MHz frequency range. They are primarily composed of nickel zinc, often combined with oxides of metals such as magnesium, manganese, copper, or cobalt.

Ferrite cores are dense, homogeneous ceramic materials formed by mixing iron oxide (Fe₂O₃) with oxides or carbonates of metals like manganese, zinc, nickel, or magnesium. The mixture is pressed, kiln-fired at around 1300°C, and then machined to meet specific operational needs. Ferrites stand out among magnetic materials due to their high electrical resistivity and low eddy current losses across a broad frequency range. These qualities, combined with high permeability, make ferrites ideal for high-frequency transformers, wideband transformers, adjustable inductors, and other high-frequency circuits ranging from 10 kHz to 50 MHz. Available in various materials and shapes, ferrites offer great flexibility in both magnetic performance and mechanical design.