COMMON MODE CHOKE COIL

摘要

The invention provides a common-mode choke coil having a structure capable of preventing malfunction of transmission IC and receiving IC in an immunity test, thereby improving immunity property. A common-mode choke coil is provided with a core 2, external electrodes 3-1 to 3-4, a pair of wires 4-1 and 4-2, and a top plate 5. The core 2 includes a winding core portion 20 and a pair of flanges 21 and 22 at both ends of the winding core portion 20. The upper surface 20a of the winding core portion 20 and the upper surfaces 21c and 22c of the flanges 21 and 22 are covered with a metal film 6. The external electrodes 3-1 to 3-4 are formed on lower portions of the flanges 21 and 22. A pair of wires 4-1 and 4-2 are wound on the winding core portion 20 of the core 2, and the ends 4-1a and 4-2a of the wires 4-1 and 4-2 are joined to the external electrodes 3-1 and 3-2, respectively, and the ends 4-1b and 4-2b of the wires 4-1 and 4-2 are joined to the external electrodes 3-3 and 3-4, respectively. The top plate 5 is bonded to the upper surfaces 21c and 22c of the flanges 21 and 22 with an adhesive 7.