Patent ID: 7838987
Filing Date: 2010-11-23
Classification: H01L,H05K,Y02P

Abstract:
1. An electronic device comprising: a semiconductor device having a package substrate with solder bumps on a bottom surface of the package substrate; a mounting substrate, having a plurality of holes, to which the semiconductor device is bonded by flip-chip bonding; and a plurality of mutually isolated standoff members supporting the package substrate on the mounting substrate with a predetermined standoff between the package substrate and the mounting substrate, wherein each of the plurality of mutually isolated standoff members comprising: an insertion portion inserted in one of the plurality of holes in the mounting substrate; and a standoff portion to contact and support the package substrate such that the standoff portion has a height, equivalent to the predetermined standoff, on the mounting substrate and enables displacement of the package substrate relative to the mounting substrate, wherein the plurality of mutually isolated standoff members are arranged separately from the semiconductor device and the insertion portion and the standoff portion are integrally formed and a diameter of the standoff portion which contacts the package substrate is larger than a diameter of one of the plurality of holes in the mounting substrate; and wherein the standoff portion of each standoff member has a flat and smooth surface that contacts against the bottom surface of the package substrate and supports the package substrate so as to allow the package substrate horizontally movable when the solder bumps are fused.