Ferrite Core for High Frequency Transformer
                     
Content
● Perpose of Ferrite Cores
● Ferrite Core : Transformer Types
1. Manganese Zinc Ferrite (MnZn)
2. Nickel Zinc Ferrite (NiZn)  
● Shapes
a. E, I Cores
b. ETD Cores
c. EFD Cores
d. EER Cores
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Purpose of Ferrite Cores
Ferrite has a high permeability, making it ideal for use as a core material. It has a high 
resistivity as well. Eddy currents and hysteresis losses are held to a minimum as a result of 
this.
Ferrite is suitable for high frequency transformer core design because of its high 
permeability and resistivity. The only negative is that, as a ceramic, it is fragile and 
susceptible to cracking. 
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Ferrite Core : Transformer Types 
Manganese Zinc Ferrite (MnZn) - useful for inductors up to 70 MHz
Nickel Zinc Ferrite (NiZn) - Higher resistivity than MnZn, useful when frequency range is 
from 2MHz to MHz in the several hundreds and ideal for inductors over 70 MHz
Temperature and permeability play huge roles in ferrite core selection, since 
ferrite materials begin to lose magnetic capabilities under 500 degrees Celsius. 
Ferrites are also classified by shapes such as:
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Ferrite Shapes
E, I Cores - easy to construct with simple bobbin winding, making them useful for power 
and telecom inductors, along with broadband, converter and inverter transformers
ETD Cores - center post has minimal winding resistance, ideal for power transformers and 
inductors
EFD Cores - made with cross-sectional areas provide utility for compact transformers
EER Cores - based on a round center post, providing a shorter winding 
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Another way is to design a custom transformer to meet the specific requirements of a given 
application. Keep in mind that while customization can provide better output at a higher 
upfront cost, it may also provide better long-term cost efficiency.
Based on the materials used to make inductors, ferrites play a significant role in how they 
work. A ferrite, which is used as the magnetic core of a transformer, is made up of iron 
oxides mixed with other components. The choice of ferrite materials has a major effect on 
the application's results.
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Thank You
If you need more assistance, you can feel free to connect with our experts who will take 
you through our wide range of ferrite products available for several applications. Contact 
us to learn more.
[email protected] www.cosmoferrites.com
+91-11 4939 8800