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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FB-43-0301 Ferrite Bead, 6mm L x 3.5mm OD x 1.3mm ID
Ferrite Bead for upper HF ~ VHF EMI suppression.Typically used for installation on PCBs.ID at ..
$0.08 Ex Tax: $0.07
FB-43-2402 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..
$0.45 Ex Tax: $0.39
FT-37-43, Toroid, 0.375" OD
Ferrite Toroid, Mix 43OD: 0.375", ID: 0.18" Height: 0.132" (Dimensions approximate)Commonly us..
$0.57 Ex Tax: $0.50
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-114A-43 Ferrite Toroid, 1.14" OD, 0.748" ID, 0.545" High
The FT-114A-43 has an increased height ( height: 13.85mm) compared with the FT-114-43 (height: 7.5mm..
$5.06 Ex Tax: $4.40
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..
$6.21 Ex Tax: $5.40
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..
$14.95 Ex Tax: $13.00
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..
$22.48 Ex Tax: $19.55
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