Patent ID: 6870265
Filing Date: 2005-03-22
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a plurality of wiring layers each comprising an interlayer insulating film and a wiring line provided above a semiconductor layer on a substrate; a plug for making a vertical connection between wiring lines of said plurality of wiring layers or between one of said plurality of wiring layers and said semiconductor layer; an internal element region in which an element provided in said semiconductor layer, said plurality of wiring layers, and said plug are disposed; and an annular seal ring provided on said semiconductor layer through at least one of said interlayer insulating films and enclosing said internal element region; wherein one of said plurality of wiring layers has a dual damascene structure in which said wiring line and said plug connected below said wiring line are integrated, and which is formed in said at least one interlayer insulating film, and at least a portion of the part passing through said interlayer insulating film of said seal ring, in which one of said plurality of wiring layers having the dual damascene structure is formed, has a vertical-plate-like annular wall extending from the upper end to the lower end of said at least one interlayer insulating film.