Dielectric porcelain constituent and multilayer alumina quality wiring substrate and package null for semiconductor device enclosing

摘要

PURPOSE:To greatly improve the dielectric constant of a dielectric ceramic composition and prevent the error operation of a semiconductor IC (integrated circuit) due to outside noise and unnecessary radiation by putting the highly dielectric layer of such composition in the inside. CONSTITUTION:A dielectric ceramic composition consists of 40-95wt.% of Al2O3 and 5-60wt.% of Re and a multilayer alumina-based circuit substrate and a package for storing semiconductor elements consist of highly dielectric layers 11, 27 on which a pair of electrode layers 15, 23, 25, 29 are formed wherein the electrode layers are formed between insulating layers 13 of mainly Al2O3. The highly dielectric layers 11, 27 of the multilayer circuit substrate and the package for storing semiconductor elements contain 40-95wt.% of Al2O3 and 5-60wt.% of Re.