Patent ID: 7357294
Filing Date: 2008-04-15
Classification: H05K,Y02P,Y10T

Abstract:
1. A method for mounting a semiconductor package onto a PCB comprising: providing said semiconductor package including an encapsulant, a chip inside the encapsulant and a plurality of outer terminals exposed out of the encapsulant; providing said printed circuit board having a surface with a plurality of contact pads for connecting the outer terminals, each contact pad has a first exposed side, an opposing exposed second side and a center between the first and second exposed sides; forming a plurality of first pre-solders and a plurality of second pre-solders on the surface of the printed circuit board such that the first pre-solders cover the first exposed sides, the second pre-solders cover the second exposed sides, a plurality of spaces are formed between the first pre-solders and the corresponding second pre-solders to expose the centers of the contact pads; and reflowing the first and second pre-solders and mounting the semiconductor package on the surface of the printed circuit board such that the outer terminals are connected to the contact pads via the first and second pre-solders, wherein both the first pre-solders and the second pre-solders are pressed by the outer terminals and, then, both the first pre-solders and the second pre-solders are heated so as to flow toward the corresponding centers of each of the contact pads.