Ferrites

Ferrites are made to different component formulas ( typically known as mix's ), to provide desired characteristics.  There is no magic "one type fits all".  Below is a table that provides a guide to some of the common mixes used in Ham Radio, and the use / frequency range over which they are most applicable.  The 'mix' numbers are "Fair-Rite" brand - other manufacturers may use identical mix numbers but the product characteristics may differ.

Mix #EMI SuppressionTransformerComment
311-300 MHz
1:1 only, < 250 MHz
Ideal for antenna feedline chokes at lower HF Ham bands.   OK for current baluns - not suitable for voltage baluns other than 1:1.
4325-300 MHz
3-60 MHz
Generally more economic that mix 31, but suited to higher HF Ham bands when used as a common mode choke.
61200-2000 MHz1-300 MHz  Lower loss therefore useful for voltage transformers where power is transferred via magnetic flux
730.1-10 MHz< 10 MHz  Low frequency EMI suppression - good choice for SMPS noise reduction.
750.15-10 MHz0.1-10 MHzGood choking impedance at low frequencies - good choice for SMPS noise reduction. 

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Ferrite Core, Clip On, Mix 31, 0.25" ID

Ferrite Core, Clip On, Mix 31, 0.25" ID

Clip-on split core suitable for RG58 Coaxial CableMix 31 offers useful choking in the HF and lower V..

$5.30 Ex Tax: $4.61

Ferrite Core, Clip On, Mix 31, 0.5" ID

Ferrite Core, Clip On, Mix 31, 0.5" ID

Clip-on split core suitable for RG8 / LMR400 Coaxial CableMix 31 offers useful choking in the HF and..

$8.90 Ex Tax: $7.74

Ferrite Core, Cylinder, Mix 31, 0.687" OD, 0.375" ID, 1.125" Length

Ferrite Core, Cylinder, Mix 31, 0.687" OD, 0.375" ID, 1.125" Length

Fair-Rite p/n 2631665702Offers useful choking impedance at HF through VHF frequencies for a single t..

$2.40 Ex Tax: $2.09

BN-43-202

BN-43-202

Binocular Ferrite Core, Mix 43Width: 13.3mm (0.525"), Length: 14.35mm (0.565"), Height: 7.5mm (0.295..

$1.30 Ex Tax: $1.13

BN-61-202

BN-61-202

Binocular Ferrite Core, Mix 61Width: 13.3mm (0.525"), Length: 14.35mm (0.565"), Height: 7.5mm (0.295..

$1.60 Ex Tax: $1.39

BN-73-202

BN-73-202

Binocular Ferrite Core, Mix 73Width: 13.3mm (0.525"), Length: 14.35mm (0.565"), Height: 7.5mm (0.295..

$1.50 Ex Tax: $1.30

FT-240-31, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High

FT-240-31, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High

Fair-Rite p/n 2631803802  Mix 31 Toroid,  commonly known as FT-240-312.4" size suitable fo..

$13.80 Ex Tax: $12.00

FB-43-2401  Ferrite Bead, 0.38" OD, 0.197" ID, 0.19" High

FB-43-2401 Ferrite Bead, 0.38" OD, 0.197" ID, 0.19" High

Ferrite Bead for upper HF ~ VHF  EMI suppression.Typically used in multiple bead strings on SMP..

$0.19 Ex Tax: $0.17

FT-37-43, Toroid, 0.375" OD

FT-37-43, Toroid, 0.375" OD

Ferrite Toroid, Mix 43OD: 0.375", ID: 0.18" Height: 0.132"  (Dimensions approximate)Commonly us..

$0.45 Ex Tax: $0.39

FT-50-43, Toroid, 0.5" OD

FT-50-43, Toroid, 0.5" OD

Ferrite Toroid, Mix 43OD: 0.5", ID: 0.281" Height: 0.188"  (Dimensions approximate)Commonly use..

$0.85 Ex Tax: $0.74

Ferrite Core, Oval Toroid, Mix 43, 1.53" Wide, 1.025" High, 1.125 long

Ferrite Core, Oval Toroid, Mix 43, 1.53" Wide, 1.025" High, 1.125 long

Fair-Rite p/n 2643167851, Mix 43 core - ideal for multi turn coaxial cable HF chokes.=> Article b..

$7.90 Ex Tax: $6.87

FT-140-43  Ferrite Toroid, 1.4" OD, 0.9" ID, 0.5" High

FT-140-43 Ferrite Toroid, 1.4" OD, 0.9" ID, 0.5" High

Fair-Rite p/n 2643802702Commonly used in Amateur Radio HF antenna feedline common mode current choke..

$3.80 Ex Tax: $3.30

FT-240-43, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High

FT-240-43, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High

Fair-Rite p/n 5943003801  Mix 31 Toroid,  commonly known as FT-240-432.4" size suitable fo..

$11.50 Ex Tax: $10.00

Ferrite Core, Binocular, Mix 61, 1.062" Long, 0.525" Wide, 0.295" High.  BN-61-6802

Ferrite Core, Binocular, Mix 61, 1.062" Long, 0.525" Wide, 0.295" High. BN-61-6802

Fair-Rite p/n 2861006802, Mix 61 core suitable for suppression applications  >250 MHz or 1 -..

$2.80 Ex Tax: $2.43

FT-140-61  Ferrite Toroid, 1.4" OD, 0.9" ID, 0.5" High

FT-140-61 Ferrite Toroid, 1.4" OD, 0.9" ID, 0.5" High

Fair-Rite p/n 5961002701Mix 61 Toroid suitable for HF transformer (voltage balun) service...

$6.10 Ex Tax: $5.30

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