Patent ID: 6329631
Filing Date: 2001-12-11
Classification: B23K,H05K

Abstract:
A solder strip exclusively for semiconductor packaging comprising a strip body having a width in the range of 1 mm. to 2 mm. and made of a stiff transparent plastic material and having a predetermined thickness, and a plurality of solder holes provided in said strip body, each of said solder holes accommodating a predetermined amount of solder paste therein, said solder paste in said solder holes being melted and downward transferred from said solder holes to islands on a BGA carrier positioned below said solder strip by directing laser beams at said solder strip, said solder strip being characterized in that said solder holes have a diameter of 10 .mu.m and are uniformly and densely distributed throughout said solder strip in a predetermined pattern, such that a proper density of said solder holes on said solder strip is obtained to provide a sufficient number of said solder holes to be covered in an area equal to the size of one of said islands on said BGA carrier, and to provide a sufficient amount of solder paste to be melted and transferred from said solder holes to said islands for bonding said BGA carrier to a semiconductor to complete said semiconductor packaging and wherein said plurality of solder holes of 10 .mu.m in diameter are distributed on said solder strip in a uniform pattern in which every two adjacent solder holes on said solder strip are spaced at an interval of 10 .mu.m.