Molypermalloy

Nickel, Iron Molybdenum alloy powder material. No thermal ageing.

MP (Molypermalloy) cores are very stable relative to flux density, temperature and DC current. They are normally used for inductors and other energy storage applications.

MP cores are normally sold pre-graded to a specific permeability tolerance. This makes them ideally suited to pure inductors, because the precise inductance will be known before winding, allowing suitable adjustments to be made to the number of turns, if required. MP cores are also widely used for energy storage inductors due to their low inductance swing when DC bias is applied.

The lower permeability MP cores can be used at frequencies above 200KHz. As the permeability of the core increases, stability tends to decrease. Available in a wide range of permeabilities, from 14µ to 205µ, The most popular permeabilities are from 60µ to 173µ, where all the advantages of the MP product are most apparent.

MP has the advantage of having constant permeability as the flux density varies up to about 3500 gauss. Above this level, permeability does tend to drop off. Other powdered core materials, such as Iron Powder, have permeability that varies with flux, adding to the potential instability of the device.