Patent ID: 7786838

Claim:
A wire wound electronic part comprising: a ferrite core having a columnar core and flanges formed at both ends thereof; a coil conductor wound around the ferrite core; and at least a pair of terminal electrodes each having a Cu conduction layer disposed on and covering an outer surface of the flange, in which both ends of the coil conductor wound around the core are conductively connected on the terminal electrodes, wherein at least one of the terminal electrodes has no plating layer and further comprises a reaction layer formed at and extending over a boundary between the Cu conduction layer and the outer surface of the flange, said reaction layer is formed from an electrode paste containing a Cu powder and a glass frit and a portion of the ferrite core, wherein the reaction layer comprises a first ferrite containing Cu and having a Zn-rich spinel structure relative to a second ferrite, the second ferrite containing Cu and having an Fe-rich spinel structure relative to the first ferrite, and a glass component in a mixed state; and the Cu conduction layer and the ferrite core are bonded at least by one of the first or second ferrite.