Choosing The Optimal Ferrite Material

Choosing the optimal ferrite material and magnetic material in general, it's made depending on the application.

Choosing The Optimal Ferrite Material

Choosing the optimal ferrite material and magnetic material in general, it’s made depending on the application. There is a difference in the use of ferrite toroid for suppression of common monde currents and in the use of ferrite toroid for broadband impedance transformers. In general, for common mode transformers, number of turns wound on the toroid will change the usable frequency range.

General description of the applications in which ferrite materials are used:

MaterialCommon Mode Choke (CMC) -1 turnCommon Mode Choke (CMC) x turnsImpedance transformer(UN-UN)BAL-UN 1:1
#313,5 - 100 MHz1,5 - 50 MHz-1,5 - 30 MHz
#4325 - 600 MHz2 - 60 MHz2 - 50 MHz2 - 30 MHz
#52150 - 1000 MHz4 - 150 MHz1 - 60 MHz1 - 60 MHz
#61200 - 2000 MHz5 - 200 MHz15 - 200 MHz10 - 100 MHz
#77200 kHz - 10 MHz100 kHz - 10 MHz0,5 - 8 MHz1 - 8 MHz

#31 Material

ParameterSymbolValueUnits
Initial permeabilityµi1500
Flux density @ field strengthB
H
3900
5
Gauss
Oersted
Residual flux densityBr3200Gauss
Coercive forceHc0.28Oersted
Loss factor @ specific freq.Tan δ/ µi20
1.0
10^-6
MHz
Temperature coefficient of initial permeability (20 -70°C)1.6%/°C
Curie temperatureTc>130°C
Resistivityρ3000ohm-cm

#43 Material

ParameterSymbolValueUnits
Initial permeabilityµi800
Flux density @ field strengthB
H
2900
10
Gauss
Oersted
Residual flux densityBr1300Gauss
Coercive forceHc0.45Oersted
Loss factor @ specific freq.Tan δ/ µi250
1.0
10^-6
MHz
Temperature coefficient of initial permeability (20 -70°C)1.25%/°C
Curie temperatureTc>130°C
Resistivityρ1×10^5ohm-cm

#52 Material

ParameterSymbolValueUnits
Initial permeabilityµi250
Flux density @ field strengthB
H
4200
10
Gauss
Oersted
Residual flux densityBr3300Gauss
Coercive forceHc0.6Oersted
Loss factor @ specific freq.Tan δ/ µi45
1.0
10^-6
MHz
Temperature coefficient of initial permeability (20 -70°C)0.75%/°C
Curie temperatureTc>250°C
Resistivityρ1 x 10^9ohm-cm

#61 Material

ParameterSymbolValueUnits
Initial permeabilityµi125
Flux density @ field strengthB
H
1500
15
Gauss
Oersted
Residual flux densityBr1000Gauss
Coercive forceHc1.1Oersted
Loss factor @ specific freq.Tan δ/ µi30
1.0
10^-6
MHz
Temperature coefficient of initial permeability (20 -70°C)0.1%/°C
Curie temperatureTc>300°C
Resistivityρ1×10^8ohm-cm

#77 Material

ParameterSymbolValueUnits
Initial permeabilityµi2000
Flux density @ field strengthB
H
5100
5
Gauss
Oersted
Residual flux densityBr1800Gauss
Coercive forceHc0.25Oersted
Loss factor @ specific freq.Tan δ/ µi15
0.1
10^-6
MHz
Temperature coefficient of initial permeability (20 -70°C)1.2%/°C
Curie temperatureTc>200°C
Resistivityρ100ohm-cm

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