High Frequency High Permeability Cores Technical Bulletin             
                   
MAGNAPERM® High Permeability Toroidal Cores are manufactured with cobalt-based METGLAS® amorphous alloy 2714A for high frequency applications. These flat loop toroidal cores offer a unique combination of ultra-high permeability, high saturation flux density and extremely low core loss for electronic component designers.

These properties make METGLAS MAGNAPERM® cores ideal for a diverse range of applications such as:

• EMI common mode filtering
• Telecommunications and data communications interface transformers
• High accuracy current transformers
• High accuracy pulse transformers
• Ground fault protection devices

Standard sizes are available from 9.6 mm to 34.1 mm OD and the possibility of manufacturing custom sizes also exists. Core coatings meeting UL94V-0 and temperature class F are available upon request.

Benefits

• Higher initial permeabiliy – which reduces the number of turns
• High permeability over a wide range of operating frequencies
• High attenuation – reduces the need for multi stage filtering
• Low profile – enabling weight and volume reduction up to 50 %
• Low loss – as a result of microthin METGLAS® ribbon (18µm)

Physical Properties METGLAS® ALLOY 2741AF

Ribbon Thickness(µm): 18
Density (g/cm³): 7.59
Thermal Expansion (ppm/°C): 12.7
Crystallization Temperature (°C): 560
Curie Temperature (°C): 225
Continuous Service Temperature (°C): 90
Tensile Strengh (MN/m²): 1k-1.7k
Elastics Modulus (GN/m²): 100-110
Vicker´s Hardness (50g load): 960

Magnatic Properties METGLAS POWERLITE® Cores

Saturation Flux Density (Telsa): 0.57
Permeability (µ@1 kHz, 2.0mA/cm): >72,000
Saturation Magnetostriction (ppm): <<1
Electrical Resistivity (µ-Ω-cm): 142