Ozeki Co., Ltd./ Electronic Materials Division /Ferrite Core

Ferrite Core

EMI Cores

The ferrite cores for EMI are imported from Fair-Rite in the United States. They are formed from over a dozen NiZn, MnZn based ferrites, and have been prepared so as to obtain large loss in the unnecessary noise frequency range (1MHz - 500MHz).

What is ferrite?
Ferrites are classified into hard ferrite and soft ferrite depending on holding power, and hard ferrites are mostly used in permanent magnets. Soft ferrites are used for EMC and represented by the chemical formula MO, Fe2O3 in which M is Mn2+ and Zn2+ for low frequencies and Ni2+ and Cu2+ at high frequencies.

[Ferrite Core Effect]
Magnetic fields are generated in the vicinity of cables which carry electricity. The magnetic fields discharged as electronic waves by the cable rather than an antenna. When this cable is passed into soft ferrite, the magnetic field that was formed in the space collects in the ferrite due to the effect of the magnetic flux of the ferrite, and only the unneeded high frequency energy is converted to heat energy and dissipated.
Soft ferrite is used in almost all digital devices as a noise control parts.

[Sample Products]
Toroidal core	Deformed sleeve core	Split core for flat cable
Sleeve core	Core for flat cable	Split core for round cable
Deformed split core	Single hole shield beads	Multi-hole shield beads
Beads with lead	Multi-hole shield plate	D-sub connector shield plate
Surface mount chip ferrite piece (automatic insertion specifications)
Surface mount common mode ferrite piece (for power source, automatic insertion specification)