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Ferrite beads are used to suppress unwanted signals that can interfere with electrical devices such as DC supplies, transmission lines and cables. They provide attenuation of selected frequency bands. The physical shape of ferrite beads is similar to a toroidal inductor, but the beads have a greater length to diameter ratio and usually a greater outside to inside diameter ratio than most toroid cores. Different size / shape beads of the same material have different degrees of suppression.  The type of ferrite material used to manufacture the bead determines the range of frequencies for suppression purposes, and the physical size and shape of the bead determines the amount of attenuation. In general the impedance is directly proportional to the length of the ferrite beads.

Important general specifications to consider when searching for ferrite beads include technology, form factor, beads in package, and packing method.  Choices for technology type include solenoidal (standard) core, toroidal, bobbin core, wirewound, multilayer, and laminated.  Solenoidal cores are rod-shaped cores. Toroid inductors look exactly like doughnuts and come in various diameters, thickness, permeability and types depending upon the frequency range of interest. They have a high inductance for the physical space occupied. A bobbin core is an inductor with a core with the shape of a bobbin or spool.  Bobbin cores are available with and without leads and in the axial and radial form. A wirewound inductor is an inductor with a core made of wound wires. Multilayer inductors are inductors constructed by layering the coil between the layers of core material.  The coil normally consists of a bare metal material (no insulation). This technology is normally referred to as "non-wirewound". The inductance value can be made larger by adding additional layers for a giving spiral pattern. Laminated inductors are ferrite beads with a core that is constructed by stacking multiple laminations on top of each other.  The laminations can be of a variety of materials and thicknesses. Form factor choices include rod, bead on leads, bar, plate, tube, and chip.  The number of ferrite beads in the package can be 1, 2, or 4.  Choices for packing method include tape reel, tray, tube, and bulk pack. 


Products & Services Related to Ferrite Beads
Chip Inductors
Chip inductors are manufactured using semiconductor material.
Inductors, Coils, and Chokes
Inductors, coils, and chokes are passive components designed to resist changes in current and store energy in the form of a magnetic field. 

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Engineering Web: Ferrite Beads
Pages: 1 - 5 of 333208
Howstuffworks "What are the bumps at the end of computer cables?"
... "bumps" are called ferrite beads or sometimes ferrite chokes. Their goal in life is to reduce EMI (electromagnetic interference) and RFI (radio-frequency interference). You can see these beads in the ...
Ferrite Beads
Ferrite beads for RFI (Radio Frequency Interference) suppression and to make small inductors ...
See Palomar Engineers Inc. Information
Inductors : Ferrite Beads
... Ferrite Beads ...
See R.P. Electronic Components Ltd. Information
Ferrite Beads
Ferrite beads do not have to be grounded and they cannot be detuned by external magnetic fields.. We recommend the #73 or the #77 ferrite bead material for the attenuation of RFI resulting from ...
Ferrite Beads : VENKEL LTD.
800) 950-8365 Toll Free. (512) 794-0081 Phone (512) 794-0087 Fax. sales@venkel.com.   Ferrite Beads All components in this section are RoHS compliant per the EU directives and definitions. Product ...
See VENKEL LTD. Information

Part Numbers for Ferrite Beads

Part # Distributor Manufacturer Product Category Description
445-2142-1-ND Digi-Key TDK Corporation Filters FERRITE CHIP BEAD 80 OHM SMD
240-2492-ND Digi-Key Steward Filters BEAD MULTI-TURN AXIAL 998 OHMS

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