Ferrite Toroids, Beads
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 Suppression | Transformer | Comment |
| 31 | 1-300 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. |
| 43 | 25-300 MHz | 3-60 MHz | Generally more economic that mix 31, but suited to higher HF Ham bands when used as a common mode choke. |
| 61 | 200-2000 MHz | 1-300 MHz | Lower loss therefore useful for voltage transformers where power is transferred via magnetic flux |
| 73 | 0.1-10 MHz | < 10 MHz | Low frequency EMI suppression - good choice for SMPS noise reduction. |
| 75 | 0.15-10 MHz | 0.1-10 MHz | Good choking impedance at low frequencies - good choice for SMPS noise reduction. |
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FT-37-43, Toroid, 0.375" OD
Ferrite Toroid, Mix 43OD: 0.375", ID: 0.18" Height: 0.132" (Dimensions approximate)Commonly us..
$0.46 Ex Tax: $0.40
FT-50-43, Toroid, 0.5" OD
Ferrite Toroid, Mix 43OD: 0.5", ID: 0.281" Height: 0.188" (Dimensions approximate)Commonly use..
$0.92 Ex Tax: $0.80
FT-50-61, Toroid, 0.5" OD
Ferrite Toroid, Mix 61OD: 0.5", ID: 0.281" Height: 0.188" (dimensions approximate)Commonly use..
$1.60 Ex Tax: $1.39
FT-82-43 Ferrite Toroid, 0.82" OD, 0..52" ID, 0.25" High
Commonly used in Amateur Radio HF QRP antenna matching..
$2.30 Ex Tax: $2.00
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..
$6.90 Ex Tax: $6.00
FT-114-43 Ferrite Toroid
Mix 43 toroid suitable for QRP baluns / chokes.Dims: 1.14" OD, 0.748" ID, 0.295" High &nbs..
$2.76 Ex Tax: $2.40
FT-140-43 Ferrite Toroid, 1.4" OD, 0.9" ID, 0.5" High
Fair-Rite Mix 43 ToroidCommonly used in Amateur Radio QRP HF baluns and antenna feedline commo..
$4.90 Ex Tax: $4.26
FT-240-43, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High
Fair-Rite Mix 43 Toroid, commonly known as FT-240-43Commonly used at HF for antenn..
$14.80 Ex Tax: $12.87
FT-240-52, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High
Fair-Rite p/n 5952003801 Mix 52 Toroid, commonly known as FT-240-52DimensionsODIDHeightm..
$25.30 Ex Tax: $22.00
BN-61-2402
Binocular Ferrite Core, Mix 61Width: 7mm (0.276"), Length: 6.2mm (0..244"), Height: 4.2mm (0.16")Hol..
$0.91 Ex Tax: $0.79
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 &..
$2.60 Ex Tax: $2.26
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...
$8.05 Ex Tax: $7.00
FT-240-61, Ferrite Toroid, 2.4" OD, 1.4" ID, 0.5" High
Fair-Rite p/n 5961003801 Mix 61 Toroid, commonly known as FT-240-61DimensionsODIDHeightm..
$32.20 Ex Tax: $28.00
BN-73-2402
Binocular Ferrite Core, Mix 73Width: 7mm (0.276"), Length: 6.2mm (0..244"), Height: 4.2mm (0.16")Hol..
$0.60 Ex Tax: $0.52
FB-73-2402, Mix 73, Bead, 0.38" OD, 0.197" ID, 0.19" High
Ferrite Bead for lower frequency (< 50MHz) EMI suppression.Typically used in multiple bead ..
$0.32 Ex Tax: $0.28