Ferrites TechnologiesA ferrite bead or ferrite choke is a passive electric component that suppresses high frequency noise in electronic circuits. It is a specific type of electronic choke. Ferrite beads employ high frequency current dissipation in a ferrite ceramic to build high frequency noise suppression devices. Ferrite beads may also be called blocks, cores, rings, EMI filters, or chokes.
A ferrite bead, or ferrite choke, is a simple hollow cylinder or bead that is made of ferrite material and that is used in order to suppress or filter the amount of high frequency electromagnetic interference (EMI) noise found in electronic circuits. Ferrite is a black semi-magnetic substance that is shaped like a cylinder and that consists of iron oxide along with a mixture of other metals. Ferrites are encased in rubber or plastic material to protect and keep the ferrite bead in place. Types of Ferrite Beads
There are several different kinds of ferrite beads. At Future Electronics we stock many of the most common types categorized by maximum DC resistance, case size / dimension, rated current, impedance, operating temperature range and packaging type. The parametric filters on our website can help refine your search results depending on the required specifications. The most common sizes for impedance are 120 O, 220 O, 600 O and 1kO. We also carry ferrite beads with impedance up to 2.7 kO. The rated current can be between 0.2 mA and 4000 A, with most ferrite beads having a rated current of 200 mA or 500 mA.
Ferrites come in a variety of shapes and sizes, with ferrite beads being the form most often used in electronic devices. They can be solid cores or snap-on cores, each fitting around a cable. Ferrite beads work by forming a low-pass filter that filters high frequency electronic noise. These beads prevent electromagnetic interference from passing either from a device or to a device.
Ferrites are used in many different electronic devices, from personal computers and power supplies to televisions and even children's toys. By using ferrites with these products, manufacturers are able to greatly improve their products ability to reduce high frequency EMI/RFI electronic noise.
Ferrite bead inductors are used in many areas of electronic equipment as a simple yet effective form of filter. One of the advantages of ferrite beads is that they are particularly easy to install. A single component can be inserted into the equipment, or a ferrite bead can be placed over a wire to provide filtering. This makes they very attractive for using when problems are encountered with equipment that is in service or having been designed, as well as for incorporating into designs at the earliest stages.
Using ferrite as their basis, these inductors are simple to make using a bead, or low cost if they are bought.
Ferrite bead inductors form very effective filters for applications such as reducing electromagnetic interference because of the properties of the ferrite using within the inductor.