Description

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FT240-77: Ferrite toroid’s can be used as common mode choke, impedance transformer or balun

Common mode choke:
77 Material is a good wide band common mode suppression solution in the low frequency range from 100 kHz up to 10 MHz. If you use multiple cable turns around the ring core, the suppression will increase while the frequency will decrease. Single turn frequency range 1 MHz – 10 MHz. Multiple turns 100 kHz – 5 MHz.

Wide band transformer:
You can make excellent impedance transformers in the frequency range from 0,5 up to 8 MHz. Typical applications are 160 – 40 meter impedance transformers or 1:1 Balun’s in the same low frequency range.

What is a Toroid Ferrite Core:
A toroid ferrite core is a magnetic component made from ferrite, a material composed of iron oxide and other metal oxides. Ferrite cores offer excellent magnetic properties and low losses at high frequencies, making them ideal for controlling electromagnetic interference (EMI) and improving signal transmission in radio circuits.

Specifications:
Frequency range: 0.1 – 10 MHz (wideband transformer, depends on the application)
Initial Permeability: µi 2000
Flux Density @ Field strength: B (H) / 5100 (5) Gauss Oersted
AL: 2590nH ± 25%
Maximum RF power: 100-200W (2-30 MHz Bal-Un transformer)
Curie temperature: >200°C
Material number: 77
Inside diameter: (ID) 35.5mm
Outside diameter: (OD) 61mm
Height: 12.7mm
Material color code: black / grey
Temperature Coefficient of Initial Permeability: (20 -70°C) 1.2 / %/°C
Resistivity: ρ / 100 / Ohm-cm
Weight: 107 g
Dimensions: 6,1 x 3,55 x 1,27 cm

Usable frequency ranges, depending on the application:
1:1 transformers (Balun): 0.5 – 8 MHz
RFI / EMI / CMC suppression: 100 KHz to 10 MHz

Suitable for high power balun up to 1 kW:
EMI/RFI suppression: <10 MHz
Inductive: <1.5 MHz
Power magnetics: 0.1 MHz