Taiyo Yuden Co., Ltd.

Katsutoshi Kuroiwa

Tomoo Kashiwa

Takahiro Samata

Koichi Iguchi

Masaki Okamoto

Takashi Tajima

A surface-mounting choke coil has a resin coating material with magnetic powder which is filled a space between the upper flange and the lower flange of a drum-type ferrite core, while covering the circumferential of the winding. The resin coating material with magnetic powder has a glass transition temperature Tg of about &#x2212;20&#xb0; C. or lower, more preferably about &#x2212;50&#xb0; C. or lower in a course of transferring from a glass state to a rubber state during changing of shear modulus with respect to temperature as a physical property when hardening, and the thickness of the upper flange of the drum-type ferrite core is about 0.35 mm or less, and a value of a ratio L/Lof an outer diameter Lof the upper flange to a diameter Lof the winding core of the drum-type ferrite core is about 1.9 or more.

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Gunma, Japan

Katsutoshi Kuroiwa