Abstract:
A printed circuit board is provided including a lower interconnect, a base insulating film formed on the lower interconnect, and a via hole formed on the base insulating film, and an upper interconnect connected to the lower interconnect with the via hole. The base insulating film has a thickness of about 3 to 100 nullm and has a breaking strength of about 80 MPa or more at a temperature of 23null C. and when the base insulating film is defined to have a breaking strength nullanull at a temperature of null65null C. and a breaking strength nullbnull at a temperature of 150null C., a value of a ratio (a/b) is about 4.5 or less.
Abstract:
A semiconductor package board for mounting thereon a semiconductor chip includes a metal base having an opening for receiving therein the semiconductor chip and a multilayer wiring film layered onto the metal base. The semiconductor chip is flip-chip bonded onto the metal pads disposed on the multilayer wiring film within the opening. The surface of the metal base is flush with the top surface of the semiconductor chip received in the opening. The resultant semiconductor device has a larger number of external pins and a smaller deformation without using a stiffener.