Axial Lead Ferrites Multilayer Chip Impedance Devices Connector Shields Ni-Zn Bead & Toroid Surface Mount Beads Power/Data Line Suppression Ferrites Electromagnetic Compatability (interference suppression) aims at maintaining an environment in which electrical and electronic apparatus can operate without being unduly affected by spurious signals. It covers two fields: The prevention of excessive polluting signals being sent out from electrical appliances, industrial equipment and electronic devices. The protection of sensitive devices by making them immune to spurious signals not regarded as excessive by national and international regulations, and controlling the emission of interference. There are two ways in which spurious signals can propogate from their sources to the endangered devices: By conductance- mains pollution, earth coupling, common current or voltage tracks. By radiation- disturbance sources include elements capable of acting as transmitters. Ferrite components are efficient and cost effective for the prevention of - and protection against - spurious signals transmitted by conductance and radiation. Enclosures reduce the radiation but still require an addition of ferrite components on wires entering and leaving the enclosure. When fitted around conducting leads, ferrites provide the efficient means of suppressing RF signals. At high frequencies where the value of Q falls to below one (1), a ferrite component will provide a series impedance, the resistive component acting in effect as a resistor in series with the circuits being protected, while the reactive component serves as a series choke. Ferrite components used in this manner provide an insertion loss to prevent high frequency leakage from screened boxes or parasitic oscillations arising from spurious feedback, and serve to suppress interference. This form of protection is possible because, at frequencies far removed from applications as inductive components, the losses in ferrite are very high. A ferrite component assembled on a lead produces no noticeable effect on the operation of equipment as, at low frequencies, the series impedance is very low. The component does not cause a voltage drop at the low frequencies but acts as a suppressor at very high frequencies where the loss resistance is very high: In addition, the reactance is also high despite a gradual decrease in permeability. As frequency increases the contribution of reactance to the total impedance diminishes and the resistive component, more efficient for suppression, becomes dominant. MMG offers suppression components in a number of ferrite materials, optimising impedance over a wide range of frequencies. The most popular materials are described below. F9C - A high permeability Manganese-Zinc ferrite with peak suppression performance up to 10 Mhz. F52 and F82 - Both high permeability Nickel-Zinc ferrites offering peak performance over a wide range from 20Mhz to 200Mhz. F01 and F14 - Lower permeability Nickel-Zinc ferrites offering peak performance at high frequencies >200Mhz.

Company Profile  What is a Ferrite?  Manufacturing Process Products  Available Stock  Quality Assurance  Capabilities  Ordering  What's New  Career Opportunities  Tech Alerts  Contact Us  Home

MMG-North America 126 Pennsylvania Ave   •   Paterson, NJ 07503   •   United States Tel: (973) 345-8900   •   Fax: (973) 345-1172 Mail us: sales@mmgna.com