Patent ID: 6284572
Filing Date: 2001-09-04
Classification: H01L

Abstract:
A method for assembling ball grid array packages, comprising the steps of:(a) installing one or more substrates into a boat; wherein said boat has one or more openings for retaining said substrates providing access to both faces of said substrates; said boat having bottom supports to retain said substrates from below, top supports to retain said substrates from above, and a means for biasing said substrates against one corner of said openings;(b) attaching dies to said substrates;(c) performing wire bond to form electrical contact between said die and said substrate;(d) encapsulating said die;(e) flipping said boat to provide access to the opposite face of said substrate;(f) marking said substrates;(g) flipping said boat to provide access to the opposite face of said substrate; and(h) attaching solder balls to said substrate.