Patent ID: 8796843
Filing Date: 2014-08-05
Classification: H01L

Abstract:
1. An electronic device assembly comprising: (a) a substrate having a top surface and a bottom surface, said top surface having an electrical trace, said substrate having an amount of bow defined as the maximum distance from any place on said top surface to a plane defined by the average height of the perimeter of said top surface; (b) a wide-gap semiconductor device chip having a contact surface and a back surface, said contact surface of said semiconductor device chip mechanically attached by flip-chip bonding to said top surface of said substrate and said semiconductor device chip electrically coupled to said electrical trace; (c) a package housing body in mechanical contact with said top surface of said substrate and not in mechanical contact with said semiconductor device chip, said package body having an electrical terminal electrically coupled to said electrical trace; (d) a package cover in thermal contact with said back surface of said semiconductor device chip; (e) a package lid; (f) at least one metal foil having a thickness disposed between said package body and said package cover, and (g) at least one bolt passing through the substrate, packaging housing body and at least one metal foil to the package cover such that the bolt provides firm mechanical contact between the substrate packaging housing body and at least one metal foil and the package cover, wherein said thickness of the at least one foil is selected so said amount of bow is at most 50 micrometers at 23° C.