Patent ID: 9190373
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate on which a wire and a pad electrode are formed; a redistribution trace formed on the semiconductor substrate; a surface layer provided on the redistribution trace and having a width which is larger than a width of the redistribution trace, a material of the surface layer being different from a material of the redistribution trace; a protective film formed on the semiconductor substrate to cover the wire and the pad electrode; a first opening that is formed in the protective film and exposes the pad electrode; a second opening that is formed in the protective film and exposes part of the wire; a first buffer layer formed on the protective film; a third opening that is formed in the first buffer layer and exposes the pad electrode through the first opening; a fourth opening that is formed in the first buffer layer and exposes part of the wire through the second opening; and a first under barrier metal film formed between the first buffer layer and the redistribution trace, wherein the protective film is inorganic insulator and the first buffer layer is resin; said redistribution trace including, a second buffer layer in contact with the first redistribution trace, the second redistribution trace, and the third redistribution trace; a fifth opening that is formed in the second buffer layer and exposes a surface layer of the first redistribution trace; and a bump electrode connected to the surface layer of the first redistribution trace through the fifth opening, and wherein the second buffer layer contacts side surfaces of the first under barrier metal film, the redistribution trace and the surface layer.