Description
FT240-77 Ferrite Toroid
FT240-77 Ferrite toroids can be used as common mode choke, impedance transformer or balun.
FT240-77
| Amidon | FT240-77 |
|---|---|
| AL(nH) | 2950 ±25% |
| Ae(cm2) | 1.58 |
| Σl/A(cm^-1) | 9.2 |
| le(cm) | 14.5 |
| Ve(cm3) | 22.8 |
FT240 Dimensions
| Dimension | mm | mm tolerance | Inch |
|---|---|---|---|
| A | 61 | +/- 1,3 | 2,4 |
| B | 35,55 | +/- 0,85 | 1,4 |
| C | 12,7 | +/- 0,5 | 0,5 |
77 Material
| Property | Symbol | Value | Unit |
|---|---|---|---|
| Initial Permeability | µi | 2000 | |
| Flux Density @ Field strength | B H | 5100 5 | Gauss Oersted |
| Residual Flux Density | Br | 1800 | Gauss |
| Coersive force | Hc | 0.25 | Oersted |
| Loss Factor @ Frequency | Tan δ/ µi | 15 0.1 | 10^-6 MHz |
| Temperature Coefficient of Initial Permeability (20 -70°C) | 1.2 | %/°C | |
| Curie Temperature | Tc | >200 | °C |
| Resistivity | ρ | 100 | ohm-cm |
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 decrees. 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.
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