| 摘要 |
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 -20° C. or lower, more preferably about -50° 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 2 /L 1 of an outer diameter L 2 of the upper flange to a diameter L 1 of the winding core of the drum-type ferrite core is about 1.9 or more.
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