Patent ID: 7453343

Claim:
A thin-film type common-mode choke coil, comprising: a laminated structure having a magnetic substrate; and electrically insulating layers and conductor layers laminated on said magnetic substrate in a direction of thickness, wherein said conductor layers form at least two coil conductors; at least two of said conductor layers are provided as spiral conductor patterns that are magnetically coupled to each other, respective kinds of magnetic flux in said spiral conductor patterns cancel each other when differential-mode currents flow in said spiral conductor patterns, and the respective kinds of magnetic flux in said spiral conductor patterns are added up when common-mode currents flow in said spiral conductor patterns; said spiral conductor patterns satisfy the expression 5 μm≦ W 1≦36 μm in which W 1 is the conductor width of each of said spiral conductor patterns; and said spiral conductor patterns satisfy the expression W 2 <T ×2 in which W 2 is the space between said spiral conductor patterns, and T is the conductor thickness of each of said spiral conductor patterns.