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This section provides an overview for ferrite cores as well as their applications and principles. Also, please take a look at the list of 14 ferrite core manufacturers and their company rankings. Here are the top-ranked ferrite core companies as of March, 2025: 1.MAGNETICS, 2.KEMET, 3.Ferroxcube..
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A ferrite core is a ceramic magnetic material called ferrite, which is mainly composed of iron, and is processed according to the application.
The use of ferrite as a magnetic core can block high-frequency currents, and is therefore effective as a noise suppressor. Ferrites are classified into different systems according to their composition, but Ni-Zn ferrites are mainly used for noise reduction.
The reasons for this are that the Ni-Zn type does not require insulation processing and has excellent high-frequency characteristics. Noise can be eliminated by passing a cable through a ring-shaped ferrite core.
Ferrite cores are used for noise reduction in electronic equipment. The noise-reducing effect of ferrite cores is not limited to noise entering the cable from the outside, but can also eliminate noise generated by the cable itself.
Ferrite cores are simple, inexpensive noise suppression components and are characterized by their easy handling. Therefore, noise suppression can be implemented without the need for design changes to the board or circuitry. Therefore, they can be used as an experimental method before finalizing the final specifications or as an emergency noise suppression measure.
There are two main principles by which ferrite cores can eliminate noise: First, they act as a filter to cut high-frequency frequencies and eliminate noise caused by high-frequency currents.
When electricity flows through the hole in the ferrite core, the cable becomes an inductor, and the impedance of the cable changes according to the magnetization of the ferrite core. At this time, the impedance becomes higher in the high-frequency band, enabling attenuation of high-frequency currents that are noise components.
Figure 1. Ferrite Core Noise Removal
Second, hysteresis loss allows noise current to be dissipated as thermal energy. When an inductor is configured by a ferrite core and an alternating current flows through it, the generated magnetic field fluctuates in direction and magnitude with time in a certain period.
The magnetization of the ferrite core making one cycle is called a hysteresis loop, and the loss of energy that occurs during this process is called hysteresis loss.
When selecting a ferrite core, there are some things to keep in mind.
A soft magnetic material called soft ferrite is used for ferrite cores. Oxides of transition metals such as nickel, iron, zinc, and copper are the main raw materials. Since the permeability of soft ferrite can be changed by its composition, the impedance can be tuned by the ratio of the main raw materials.
Impedance has two components, namely reactance and resistance. The material composition of a ferrite core for noise rejection contains a large amount of resistance component. Therefore, noise rejection is more effective in dissipating the energy of noise current as heat due to hysteresis loss than in filtering to cut high frequencies.
The noise rejection performance of a ferrite core is evaluated by its impedance. Impedance is determined by material properties, shape factor, and number of turns.
The material properties are determined by the composition of the soft ferrite. The shape factor is the cross-sectional area of the ferrite core divided by the average magnetic path length. Therefore, a ferrite core with a large cross-sectional area and a small inner diameter performs better. For better noise rejection, wrapping the cable around the ferrite core multiple times is also effective.
However, when a conductor is wound more than once, the beginning and end of the winding are close to each other, creating stray capacitance between them. Since this stray capacitance reduces the effectiveness of countermeasures against high-frequency components, it is necessary to wind the cable while keeping an eye on the frequency band for which noise reduction is desired.
*Including some distributors, etc.
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KEMET has a portfolio of over 1,600 patents serving the automotive, aerospace, industrial, telecommunications, computing, consumer, and medical devices. KEMETs devices provide filtering, sensing, energy storage, power conversion, and haptic actuator technology. Among these devices are capacitors, electromagnetic compatibility (EMC) components, resistors, circuit protection devices, inductors, sensors, Piezoelectric devices, release, transformers, and engineering kits.
Founded in 1949, Magnetics® is a leading world supplier of soft magnetic components and materials for the electronics industry. We specialize in research, design and production of high-quality powder cores, ferrite cores, tape wound cores, nanocrystalline cores, and amorphous cores for applications such as chokes, inductors, filters, transformers and power supply components for use in alternative energy, uninterruptible power supplies (UPS), telecommunications, aerospace, military, medical and other electronics systems.
Magengine Co.,ltd was founded in 2005 and is a manufacturer of neodymium iron boron, samarium cobalt, ferrite, aluminum nickel cobalt, and magnetic tools based in Xicheng, Beijing, China. The company manufactures various products such as linear motor, casting steel, bonded magnets, soft ferrite, and EV charger products. The products have been used in various industries such as automobile, wind power, servo motors, rail transit, and medical equipments. The company has passed the ISO 9001:2015 certification for the quality management system.
TDK Corporation, established in 1935, is a manufacturer of electronic solutions for the smart society based in Tokyo, Japan. The company is a part of the TDK Group, which has over 250 locations in more than 30 countries worldwide and employs over 103,000 people. They offer a wide range of products, including sensors, power supplies, and magnetic application products. The robotics industry is evolving at a rapid pace, and they are now offering , a robot development platform equipped with a variety of sensors essential to the accurate operation of robots, enabling more efficiency across a wide range of robot development.
Ferroxcube was founded in 1941 and is located in Taiwan, is a supplier of ferrite cores, accessories, and EMI suppression products utilizing ferrite components & ferrite-ceramic technology that are used by equipment manufacturers for protection from electromagnetic interference. The company provides ferrite tubes, rod cores, ferrite multihole, and cable shield along with multilayer inductors, epoxy-coated toroids, SMD CMM choke & SMD beads, perylene coated toroids that have uses in the machinery & equipment manufacturing industries. They comply with the RoHS & PFOS 2006/122/EC regulations and offer materials based on frequency bands, thermal conditions, and types of noise to be suppressed.
King Core, established in the year 1986, and based in Taoyuan City, Taiwan is a manufacturer and supplier of power inductors for EMC/EMI solutions. The product portfolio of the company includes a diverse range of chip beads, chip inductors, ferrite cores, power choke, and common mode choke. The products are used in various industries which include automotive, electronics, network communications, IT products, new energies, and industrial equipment. The company offers ISO-certified products with other certifications.
Fair-Rite Products Corp was founded in 1952 and is based in Wallkill, New York is a manufacturer of Suppression Components for various industrial applications. They provide power & inductive Components, engineering Kits, ferrite rods, ferrite toroids, and, mini power kits as well as signal solution kits, high-frequency toroid kits, and, round cable EMI suppression ferrite cores that have applications in the electronics & electrical, construction, industrial machinery manufacturing, and, automotive arenas. The company is ISO 9001 and TS 16949 certified and offers custom manufacturing, prototype development, and engineering assistance services.
Seiwa Electric MFG Co., Ltd is a manufacturer of information display systems, lighting and noise countermeasure equipment, based in Kyoto, founded in 1945 (Samsung Electric Co., Ltd.,) and established in 1949. Their products include: electromagnetic noise countermeasure (EMC), waterproof and shockproof LED information display, their own blue light-emitting diode and white light-emitting diode, tunnel disaster prevention system and road & tsunami information display system. Seiwa Electric acquired ISO14001:2004 certification at all offices. Outside of Japan, they have offices and subsidiaries in Thailand, Vietnam and China.
Kitagawa Rubber Industries Co., Ltd., established in 1963 with headquarters in Japan, is a manufacturer and distributor of electronic components and equipment. The company’s products include EMC noise suppression components, thermal pad components, a plastic component series for holding PCBs, and plastic component ties. Kitagawa Rubber Industries is also involved in the technologies and services fields, providing components for the new energy products, biotechnology, industrial robots, semiconductors, and medical markets. The company has international offices located in the USA and China and also maintains ISO 9001 certification.
Electronic Grup, S.L is an importer and distributor of electronic, computing, and telephone products that was established in Catalonia, Spain in 1998. The company mainly markets products from brands such as Arduino, D-Link, and Samsung. It stocks microcontrollers for use in embedded systems, resistors for adjusting voltage in a circuit, and transistors for amplification or switching. It also offers LEDs and integrated circuits for chips and semiconductors. The company chiefly markets to clients in the audiovisual, telecom, and robotics industries.
Hybrid Electronics is a global distribution specialist of electronic components, with access to over 50 million unique components. Among the markets HE serves are the aerospace, automotive, communications, defense, industrial, medical, national security, and test & measurement industries. In addition to components, HE also provides quality and compliance testing, counterfeit detection, upscreening, and other forms of quality control. Examples of component subtypes that HE offers include ICs, batteries, capacitors, semiconductor products, sensors, circuit protection, interconnectors, filters, optoelectronics, relays, switches, power supplies, and cables and cable assemblies.
Ranking as of March 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | MAGNETICS |
14.5%
|
| 2 | KEMET |
11.9%
|
| 3 | Ferroxcube. |
10.0%
|
| 4 | King Core |
8.1%
|
| 5 | Magengine Co.,ltd |
7.6%
|
| 6 | SEIWA ELECTRIC MFG CO.Ltd |
7.6%
|
| 7 | Hengchuang Magnetoelectronics Co., Ltd. |
7.1%
|
| 8 | Fair-Rite Products Corp. |
6.7%
|
| 9 | KITAGAWA INDUSTRIES CO., LTD. |
6.4%
|
| 10 | Electronic Grup, S.L |
6.2%
|
Derivation Method
The ranking is calculated based on the click share within the ferrite core page as of March 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
Japan
|
3 | 33.3% |
|
United States of America
|
2 | 22.2% |
|
Taiwan
|
2 | 22.2% |
|
China
|
1 | 11.1% |
|
Spain
|
1 | 11.1% |
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