Ferrites are dense, homogeneous ceramic structures made by mixing iron oxide (Fe2O3) with oxides or carbonates of one or more metals such as manganese, zinc, nickel, or magnesium. They are pressed, then fired in a kiln at 2000 degrees F, and machined as needed to meet various operational requirements.
MAGNETICS Ferrites
Ferrites described in this catalog are the manganese-zinc type used
for communications (frequencies from 1 KHz to 1000 KHz) and for power applications
such as in switching power supplies.
Advantages of Ferrites
Ferrites have a paramount advantage over other types of magnetic materials:
high electrical resistivity and resultant low eddy current losses over
a wide frequency range. Additional characteristics such as high permeability
and time/temperature stability have expanded ferrite uses into quality
filter circuits, high frequency transformers, wide band transformers, adjustable
inductors, delay lines, and other high frequency electronic circuitry.
As the high frequency performance of other circuit components continues
to be improved, ferrites are routinely designed into magnetic circuits
for both low level and power applications. Another factor in choosing ferrites
is the higher cost of magnetic metals. For the most favorable combination
of low cost, high Q, high stability, and lowest volume, ferrites are the
best core material choice for frequencies from 10 KHz to 50 MHz. Ferrites
offer an unmatched flexibility in magnetic and mechanical parameters.
Summary of Ferrite Advantages
MPP, HIGH FLUX
& KOOL MU POWDER CORES
Molypermalloy powder cores (MPP) are available in ten permeabilities
of 14 through 550, and have guaranteed inductance limits of +/- 8%. Insulation
on the cores is a high dielectric strength finish not affected by normal
potting compounds and waxes. Twenty-nine sizes include IDs from 0.070"
to 1.9" and ODs from 0.14" to 3.1". Standard cores include
either temperature stabilized (as wide as -65 degrees CC to +125 degrees
C) or unstabilized.
High Flux powder cores have a higher energy storage capacity than MPP cores and are available in six permeabilities from 14 through 160. Kool Mu powder cores also have a high energy storage capacity, but are more economical than High Flux or MPP cores, and are available in five permeabilities from 26 through 125. Both types come in sizes identical to MPP cores.
Powder cores are excellent as low loss inductors for switched-mode power supplies, switching regulators, and noise filters. Most core types can be shipped immediately from stock.
For further information write for catalogs MPP-303X and KMC-02.
APPLICATIONS: Inductors for high Q, low loss filter circuits, Loading Coils, Transformers, Chokes, and Inductors.
TAPE WOUND CORES
Tape Wound Cores are made from high permeability alloys of nickel-iron,
grain oriented silicon-iron, and cobalt-iron. The alloys are known as Orthonol,
Alloy 48, Square Permalloy 80, Round Permalloy, Supermalloy, magnesil,
Supermendur, and METGLAS alloys. Cores are available in all IEEE standard
sizes and over 1,400 special sizes.
For a wide range of frequency applications, materials are produced in thicknesses from 1/2 mil through 14 mils. All core sizes can be provided in non-metallic (phenolic or plastic), aluminum, or GVB (Guaranteed Voltage Breakdown) coated aluminum boxes. Magnesil material, being less sensitive to external stresses, is also available unboxed or epoxy encapsulated. Commonly used sizes are in stock for immediate shipment.
For further information write for Catalog TWC-400.
APPLICATIONS: Magnetic Amplifiers, Converters, Inverters, Reactors, Regulators, Static Magnetic Devices.
BOBBIN CORES
Miniature Tape Wound Bobbin Cores are manufactured from Permalloy 80,
Orthonol, and Metglas alloy 2714A ultra-thin tape (0.000125" to 0.001"
thick). They are available in widths from 0.023" to 0.250" (wider
on special request). Wound on non-magnetic stainless steel bobbins, core
diameters are available down to 0.050" or less, with flux capacities
as low as several maxwells.
MAGNETICS sophisticated pulse test equipment reproduces most test programs and can measure accurately in the millivolt-microsecond region. Standard sizes are available from stock.
For further information write for Catalog BOBCAT-100. Now also available on disk.
APPLICATIONS: Magnetometers, GFluz Gates, High Frequency Counters, Timers, Oscillators, Inverters, Magnetic Amplifiers.
CUT CORES
SUPERMENDUR C and E cores are used in power transformers at frequencies
up to 1500 Hz where minimum weight and size are required.
PERMALLOY 80C Cores are ideal for the output transformer of high frequency, high power inverters. The low core loss of these cores makes them suitable up to 5000 gauss, at frequencies up to 25 kHz. Other uses: high power pulse transformers, high frequency inductors, and low loss current transformers.
ORTHONOL C Cores have a saturation flux density of 15,000 gauss, and a core loss approximately one-half that of a silicon-iron C Core of the same material thickness. These cores are suitable for power transformers operating at flux densities to 10,000 gauss, and frequencies to 8 KHz.
METGLAS alloy cores offer low losses up to 100 KHz at flux densities comparable to 50 Ni/50 Fe cores. The allow is attractive for magnetic core devices where ruggedness and low weight are important.
For further information write for catalog MCC-100 Nickel-Iron and Supermendur Cut Cores
CUSTOM
COMPONENTS Ferrites can be pressed in block form and then machined into intricate shapes. Where large sizes are required, it is possible to assemble them from two or more smaller machined or pressed sections; the variety of sizes and shapes is limitless.
Without sacrificing magnetic properties, many operations can be performed on ferrites, while maintaining strict dimensional or mechanical tolerances:
In addition to machined ferrites, components for custom applications include unusual core configurations, both cut and uncut, from strips as thin as 1/8 mil.
Standard catalog items can also be modified, as needed, to fit your requirements.
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