Patent ID: 6417575
Filing Date: 2002-07-09
Classification: H01L

Abstract:
A semiconductor device comprising:a pad electrode comprising: a pad section made of substantially a conductive electrode material; and an underlying film covering at least part of said pad section at least at a bottom and a side wall of said pad section, wherein a material of said underlying film is harder than said electrode material and at least part of an upper surface of said pad section is exposed for connection to a wire, a shape of a plan view of said pad electrode is one selected from the group consisting of a near circle, a near ellipse, a near polygon with at least one internal angle larger than 90 degrees and a near polygon with at least one corner chamfered or rounded, said pad electrode comprises: a lower protruding section protruding downward from said pad electrode, said lower protruding section having a cross-sectional area smaller than said pad electrode and a shape of a plan view of said lower protruding section is one selected from the group consisting of a near circle, a near ellipse, a near polygon with at least one internal angle larger than 90 degrees and a near polygon with at least one corner chamfered or rounded.