Patent ID: 8704367

Claim:
A semiconductor device comprising: a semiconductor substrate on which a wire and a pad electrode are formed; a metal film formed over the semiconductor substrate; a surface modifying layer formed on a surface layer of the metal film; a redistribution trace formed on the metal film via the surface modifying layer; 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 an inorganic insulator and the first buffer layer is resin, the resin is selected from polyimide resin, acrylic resin, and phenolic resin, and the redistribution trace includes a first redistribution trace connected to the pad electrode through the first opening and the third opening, a second redistribution trace connected to the wire through the second opening and the fourth opening, and a third redistribution trace formed over the first buffer layer.