Electric Coils/

Choke Coils

Choke coils, also known as choking coils, are low-resistance electrical coils with high inductance that are used to block high-frequency alternating currents (AC) of electricity while allowing low-frequency direct currents (DC) to pass through. As passive components depending on the property of self-inductance, choke coils operate based on the generation of an electromotive force (EMF) in a circuit that results from the changing of the current in that circuit.

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Sag Harbor Industries, Inc.
Sag Harbor, NY
800-724-5952
With multiple U.S. manufacturing locations, Sag Harbor Industries is equipped with state-of-the-art automated and semi-automated equipment that are geared for both high volume production and shorts runs in the most economical and efficient methods. When it comes to high quality choke coils, contact the company you can depend on. Call Sag Harbor today to get started.
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Johnson Electric Coil Company
Antigo, WI
800-826-9741
At Johnson Electric Coil Company, the dedicated staff is constantly striving to give all customers a "Worry Free Experience". The company takes their responsibility to provide high quality products extremely seriously, so when you are looking for new choke coils, you can rely on them for dependable products. Contact Johnson Electric today so the company can get to work finding what you need.
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PolyTech Coil Winding
Tacoma, WA
253-324-3044
Founded in 1986, PolyTech Coil Winding has been consistently meeting all prototype and production needs of various industries. Able to produce virtually any choke coils you may require, PolyTech is the place to turn for all design and fabrication needs. Striving for exceptional quality in all of their products, they are a company you can depend on for the items you have been searching for.
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Caterina Engineering Services
Laguna Niguel, CA
951-640-9674
Since 2003, the focus of Caterina Engineering Services has been providing finished parts to our customers' drawings and specifications. We provide project level engineering services at our facility for all of your choke coils and other needs. With over two decades of experience working with engineering companies and leveraging their China presence, they offer a unique East-West synergy.
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Coilcraft, Inc.
Cary, IL
800-322-2645
At Coilcraft, they believe the best way to flourish as a company is to care for their people and the planet. They strive not only to create the best products, but to do so in the best ways possible. When it comes to choke coils, they have the high quality products that will fit to all of your desired application goals. Call or visit the website today to begin finding the products you need.
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Industry Information

Choke Coils


Choke coils are electrical coils that work to block common-mode currents while passing differential, or equal but opposite, currents. Although they provide a very specific function, choke coils can be utilized in a broad range of applications including: power generation, in order to protect power lines from electromagnetic interference (EMI) or radio frequency interference (RFI); automotive, for use in engine applications; electronics, to protect electrical devices from EMI and RFI that could cause them to malfunction; and HVAC, for use in equipment such as furnaces, air conditioners and blowers. There are several different types of choke coils and one of the main differences in construction between the types is the core material, which can include iron powder, ferromagnetic, non-magnetic and ferrite. What metal is chosen depends on the conductivity level desired.

Often used in EMI and RFI interference protection applications, there are two main categories of choke coils utilized in radio circuits: audio frequency coils (A.F. chokes) and solid-state chokes (SSC), which are also known as electronic ballast or electronic chokes. A.F. chokes are, as the name suggests, designed to be used with audio frequency applications, and as a result have a core constructed from ferromagnetic iron that allows for increased induction capabilities, much like the induction coil. Within A.F. chokes, there can be other categorizations based on how high of a frequency the choke coil is able to function with. For moderately high frequencies, A.F. chokes typically have a core constructed from iron powder or ferrite, while for very high frequencies A.F. chokes most often have a core constructed from non-magnetic cores. The non-magnetic cores could be so simple as to only require air surrounding the coil. When it comes to SSC, they are capable of operating with even higher frequencies than A.F. chokes. In addition, SSC are capable of reducing the high noise levels typically associated with higher frequencies. Additional types of choke coils include medium frequency (MF) radio chokes, high frequency (HF) radio chokes and very high frequency (VHF) chokes.