Common Mode Choke Cores 2022-05-19T12:15:42+00:00

Nanocrystalline Common Mode Choke Cores


Nanocrystalline cores have very high permeability over low frequency to high frequency. They are very suitable for common mode chokes used as EMC filters to compress conducted common mode noise. Compared to traditional ferrite cores, nanocrystalline cores have a lot of advantages as high inductance, good filter effective, small size and volume,lower turns of copper wire, lower power consumption and high efficiency.Nanocrystalline cores have very high curie temperature about 560℃, much higher than traditional ferrite core about200℃. High curie temperature make nanocrystalline core excellent thermal stability, and can continuous working at up to120℃ environment. Nanocrystalline cores is the best choice for application of common mode choke.


  •  High initial permeability: Larger insert loss, better inhibiting effect on conducted interference than ferrite.

  • High saturation induction: about 2-3 times higher than ferrite, hardly magnetized to saturate in the cases of current strong interference.

  •  Excellent temperature stability: higher Curie temperature, the changes in alloy performance obviously lower than ferrite under the circumstance of larger temperature fluctuations, showing excellent temperature stability

  • Flexible frequency characteristic: More flexible to obtain the required frequency characteristic through adjustment process.

Physical Properties 

Saturation Magnetization(Bs)1.25TSaturation Magnetostrictive Coefficient(λs)<2×10-6
Curie Temperature(Tc)560℃Density(d)7.3g/cm3
Crystallization Temperature(Tx)510℃Resistivity(ρ)130μΩ-cm
Hardness(Hv)800Continuous Operating Temperature Range-55~130℃

Magnetic Properties

Annealing MethodNon-magnetic Annealing
Initial Permeability>150,000
Maximum Permeability>600,000
Residual Magnetic Flux Density0.6T
Iron Loss P(20kHz,0.5T)<25W/kg
Iron Loss P(100kHz,0.3T)<150W/kg
Iron Loss Change Rate (-55℃~125℃)<15%
"Amorphous Inductor"


  • Frequency converter

  • Inverter (Inverter Welder, Photovoltaic Inverter)

  • Converter

  • Electric vehicle charging pile

  • Gas insulated switchgear

  • High energy particle accelerator

  • UPS

  • EMC filter

  • Wind power

  • Board card

  • Inverter air conditioner

  • Flat panel TV

  • Radiant-cooker

Performance Curves

Core Dimension

OD-Outside Diameter ;  ID-Inside Diameter ; HT- Height


Note: AL is single-turn inductance, test level is 0.3V, and 10-100KHz output inductance in Table is ±25%. AL test instrument is HT2816B. We can make magnetic core coating, and customize products of other dimensions excluded in the Table according to customers’ requirements.


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