Patent ID: 6020221
Filing Date: 2000-02-01
Classification: H01L

Abstract:
A method for producing a semiconductor package interconnectably mounted on a semiconductor package substrate without substantial package warpage, comprising the steps of:a. providing a semiconductor package and a semiconductor package substrate having first and second major sides, the substrate having a substantially rectangular outer shape, the rectangular outer shape defining a diagonal axis;b. providing a stiffener member which is attachable to said semiconductor package substrate, the stiffener having a mass (M) and being shaped such that the moment of inertia about the diagonal axis of the stiffener has a smaller value than the moment of inertia about the diagonal axis of a structure having mass M, a substantially rectangular outer shape, and a rectangular cut-out portion;c. attaching said stiffener member to said semiconductor package substrate;d. interconnectably mounting said semiconductor package to said first major side of said semiconductor package substrate; ande. applying an interconnect array package on said second major side of said semiconductor package substrate.