Tdk Corporation

Ippou Hirai

Masahiko Watanabe

Yuji Sezai

An Mn&mdash;Zn based ferrite composition having a main component comprised of Fe O : 51.5 to 54.5 mol %, ZnO: 19.0 to 27.0 mol % and the rest of substantially MnO and a first sub component comprised of 0.002 to 0.040 wt % of SiO , 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of the main component. In a magnetic core for a transformer comprised of this composition, the THD of the transformer becomes &minus;84 dB or less in a broad frequency band, so it can be preferably used as a magnetic core, for example, for an xDSL modem transformer.

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Tokyo, Japan

Ippou Hirai