Description
FT140-61 Ferrite Toroid
FT140-61 Ferrite toroids can be used as common mode choke, impedance transformer or balun.
FT140-61
| Amidon | FT140-61 |
|---|---|
| AL(nH) | 140 ±25% |
| Ae(cm2) | 0.79 |
| Σl/A(cm^-1) | 11.2 |
| le(cm) | 8.9 |
| Ve(cm3) | 7 |
FT140 Dimensions
| Dimension | mm | mm tolerance | Inch |
|---|---|---|---|
| A | 35,55 | +/- 0,75 | 1,4 |
| B | 23,0 | +/- 0,55 | 0,9 |
| C | 12,7 | +/- 0,5 | 0,5 |
61 Material
| Property | Symbol | Value | Unit |
|---|---|---|---|
| Initial Permeability | µi | 125 | |
| Flux Density @ Field strength | B H | 2500 15 | Gauss Oersted |
| Residual Flux Density | Br | 1000 | Gauss |
| Coersive force | Hc | 1.1 | Oersted |
| Loss Factor @ Frequency | Tan δ/ µi | 30 1.0 | 10^-6 MHz |
| Temperature Coefficient of Initial Permeability (20 -70°C) | 0.1 | %/°C | |
| Curie Temperature | Tc | >300 | °C |
| Resistivity | ρ | 1 x 10^8 | ohm-cm |
Common mode choke
61 Material is a good wide band common mode suppression solution in the high frequency range from 25 up to 2000 MHz. If you use multiple cable turns around the ring core, the suppression will increase while the frequency will decrees. Single turn frequency range 200 – 2000 MHz. Multiple turns 25 – 300 MHz.
Wide band transformer
You can make excellent impedance transformers in the frequency range from 15 up to 200 MHz as well. Typical applications are end fed antenna impedance transformers, off center fed antenna impedance transformers or 1:1 Balun’s.
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