Patent ID: 6735857
Filing Date: 2004-05-18
Classification: H01L,H05K,Y02P,Y10T

Abstract:
A ball grid array mounting method, in which a ball grid array is soldered onto a printed circuit board comprising:(a) applying solder paste beforehand onto at least one of a plurality of lands of a printed circuit board which are in a position of through-holes of said printed circuit board and a plurality of solder balls of said ball grid array which are connected with pads of said ball grid array; (b) attaching and superimposing said through-holes of said printed circuit board and said solder balls of said ball grid array; (c) melting said solder bails and said solder paste by heating both said ball grid array and said printed circuit board, to flow into said through-holes, to be led into through-hole bottom face lands which said solder balls and said solder paste wet and where said solder balls and said solder paste spread out; and (d) sticking and effecting said pads of said ball grid array securely together with said lands of said printed circuit board, which are in the positions of said through-holes of said printed circuit board, whereby solder fillets are formed on said through-hole bottom face lands.