For PI, it includes power dissipated in the wire also. Pd(mW) : Sum of the power dissipation in the core, in milliwatts.H(Oe) : Core field intensity in Oersted.μ : (PI) Permeability (Hidden by default.).μ'' : (F) Complex permeability - resistive part.μ' : (F) Complex permeability - reactive part.Rw(Ω) : (PI) - Resistance due to wire losses in Ohms.Rc(Ω) : (PI) - Resistance due to core losses in Ohms.R(Ω) : (F) - Resistance due to core losses in Ohms.Tapping on a data point will display the parameters for a single frequency. Each parameter may be displayed or hiddenīy tapping on the legend key. The chart title contains manufacturer, size, material and part number of the device.Ĭalculated parameters are displayed against frequency (log scale). Note: Manufacturers recommend keeping the number of turns (N) to a minimum. f : Shifts the frequency of interest of the chart display from left-to-right.Determines the flux-density (B) and field-intensity (H) within the ferrite toroid. Vrms : The RMS voltage applied to the inductor (Volts).Maximum (100%, slider to hard-right) is reached when the turns are adjacent at the toroid's inner radius.

Controls how many single-layer turns can be achieved around the core. Nd : Winding density at the toroid inner-diameter.Suppressor mode displays effective suppression frequency range in square brackets. (Pick lower μi for higher frequency applications.) Inductor mode shows initial permeability in square brackets.

Material : Manufacturers material mix code.

Size : Selects the size of the toroid.

This limits the material selection as appropriate.

Application : Selects the intended use of the toroid, either Inductor or Suppressor is currently supported.

Section, where the user can select the application type, toroid material, toroid size, wire size, number of windings and excitation voltage. Schematic display, where a scaled image of the toroid and windings is presented to help with intuitive design. At the top is the chart display for showing frequency-dependent characteristics. The calculator has 4 separate display areas. To predict the component's characteristics. It uses the manufacturer's (Fair-Rite & Micrometals) published data including the toroid's dimensions and complex permeability characteristics RF Toroid Calculator was developed to help users predict the RF characteristics of a ferrite or powdered-iron toroid wound as an inductor or suppressor.

Ferrite core inductor calculator