Ferrite core for cable
LAIRD TECHNOLOGIES
Our cylindrical EMI suppression ferrites provide a cost-effective means to reduce common and differential mode EMI. These ferrite cable cores are most frequently used to suppress common mode EMI on the internal and external cable assemblies of electronic equipment. By decreasing the levels of EMI radiated by internal cables, ferrite cable cores can reduce the cost and amount of overall shielding required to confine EMI within a product's enclosure. They can also be used successfully on power cables that carry digital or analog signaling.
To achieve maximum EMI filtering performance in a given application, select a ferrite with an inner diameter most closely matching the outer diameter of the wire or wire bundle to be filtered. The in-circuit impedance may be substantially increased by passing two turns of the wire conductor through the ferrite cable core. A typical common mode application might have two conductors passed through a ferrite cable core. With equal and opposite currents flowing through the core, zero net bias is established through the component and, thus, maximum impedance is realized from the ferrite.
