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Incorporating Ferrites in Electrical Product Designs



Small details can make a big difference. For example—electromagnetic interference (EMI) can cause problems in the operation of electrical or electronic devices. One solution to help reduce EMI is incorporating ferrites into the product design.

A ferrite is a bead that reduces or helps prevent EMI from a device or to a device. EMI is an occurrence generated by another strong electromagnetic field or signal which affects the performance of an electrical or data circuit, adversely affecting equipment performance.

Ferrites offered by Interpower consist of permeable substances that are used to suppress unwanted EMI from entering or leaving the equipment through the power cord or cord set. They have medium permeability and high resistive impedance. Designed for suppression of signals between 30 and 300MHz, these ferrites are made mostly of nickel zinc. A combination of oxides from other metals, such as magnesium, manganese, copper, or cobalt, may also be included in the makeup. 

When determining what kind of ferrite to use on the cable, there are several factors to consider: impedance range, frequency range, and size and kind of cable it will be used on. When applying the ferrite onto the cable, Interpower recommends molding it four to six inches from the strain relief at the equipment or the IEC 60320 connector of a cord set. Interpower offers three different ferrites which can only be molded onto North American cable. There is one snap-on version which can be used on both international cable and North American cable. 

The following table shows the ferrites offered by Interpower.

Part Number Minimum Impedance Impedance Frequency Cable Choices
52100040 25 MHz —
100 ohms
100 MHz —
approx. 200 ohms
30–200 MHz

3x16AWG SJT fillerless PVC

3x14AWG SJT fillerless PVC

52100050 25 MHz —
104 ohms
100 MHz —
approx. 213 ohms
30–200 MHz 3x18AWG SJT fillerless PVC
52100060 25 MHz —
137 ohms
100 MHz —
approx. 250 ohms
30–200 MHz 3x18AWG SVT fillerless PVC
52100110 30-100 MHz — approx. 50 ohms 100-500 MHz — approx. 100 ohms 30–300 MHz

3x0.75mm2 PVC and rubber

3x1.00mm2 PVC and rubber

3x1.50mm2 PVC

3x18AWG PVC and rubber



Additional Resources

See the complete line of Ferrites and Value-Added Services available at Interpower.

Interpower offers a 1-week U.S. manufacturing lead-time on non-stock Interpower products, no minimum order or dollar requirements, and same day shipping on in-stock products. Blanket and scheduled orders along with value-added services are available. If you have questions, Interpower offers free technical support. You can check the website at, e-mail (United States) or (United Kingdom) or contact Customer Service in the United States at (800) 662-2290 or in the United Kingdom at +44 (0)1908 295300.



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Interpower Components Ltd.  10 Kelvin Drive  Knowlhill  Milton Keynes  Buckinghamshire  MK5 8NH  United Kingdom

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