Nanocrystalline Cores

For Common Mode Filters and Current Transformers

Nanocrystalline cores are a choice solution for common mode choke (CMC) applications as they exhibit high permeability, low power loss, and high saturation. Common mode chokes made with nanocrystalline material are used in a wide range of applications including switched-mode power supplies (SMPS), uninterruptible power supplies (UPS), solar inverters, frequency converters, EMC filters, EV chargers, and multiple automotive and welding applications. When compared to ferrite cores, nanocrystalline cores provide a wider operational temperature range and significantly higher impedance at high frequencies.

Key Characteristics

  • Composition: Fe•Si•Nb•Cu•B
  • Shapes: Toroid, Cut Toroid, Slotted Toroid, Cut Core
  • Sizes: 5 mm to 145 mm
  • Flux Density (T): 1.25
  • Coating Color: Blue, Green

Due to the high permeability of nanocrystalline cores, common mode chokes, current transformers, and magnetic amplifiers (magamps) can be smaller in size and handle higher current. Saturation induction of 1.25T and a wide temperature range mean that CMCs made with nanocrystalline cores are less vulnerable to current imbalance and loss of performance at high temperature. The material's low AC losses result in excellent efficiency, and the option of durable cases - available in polyester (<130°C) and rynite polyester (<155°C) - makes cores suitable for winding with thick wire. 

Magnetics is expanding our nanocrystalline product line for the following applications:

  • AC Current Transformer
  • Zero Phase Current Transformer
  • DC Immunity Current Transformer
  • Hall Effect Sensors with cut current transformer cores

For assistance in selecting a nanocrystalline core for any of these applications, Contact Magnetics.

For more information on Magnetics' new nanocrystalline cores, view our technical bulletin.

View Nanocrystalline Material Property Curves including Impedance vs. Frequency, Permeability vs. Temperature, and B-H Loop.

Nanocrystalline Part Number Identification

How To Order: Magnetics Tape Wound Cores

Part Number

Core Area

Path Length

Bare OD

Bare ID

Bare HT

OD max

ID min

HT max

CMC016010006H 0.15 4.10 16.0 10.0 6.0 17.8 8.2 7.9
CMC020012008H 0.27 5.02 20.0 12.0 8.0 22.6 10.6 10.0
CMC025016010H 0.37 6.43 25.0 16.0 10.0 27.5 13.8 12.6
CMC030020010H 0.41 7.85 30.0 20.0 10.0 33.0 17.6 13.2
CMC030020012H 0.49 7.90 30.0 20.0 12.0 34.0 18.0 15.2
CMC030020015H 0.63 7.90 30.0 20.0 15.0 33.6 17.7 17.8
CMC040025015H 0.92 10.20 40.0 25.0 15.0 44.2 21.6 18.9
CMC040032015H 0.50 11.30 40.0 32.0 15.0 45.5 28.5 18.8