Patent ID: 6504104
Filing Date: 2003-01-07
Classification: H01L,H05K,Y02P,Y10T

Abstract:
A flexible circuit for transforming an integrated circuit substrate having an upper surface with edge contacts into a ball grid array by positioning the flexible circuit at a lower surface of the substrate and folding at least one edge region up, over and around a side of said substrate so that the at least one edge region lies adjacent the edge contacts, comprising:a supporting film carrying a circuit layout having a plurality of terminals in a grid array for receiving a plurality of multiple solder humps to be respectively disposed at said terminals to form balls of the ball grid array; conductors connected to said terminals proceeding outwardly from the terminals to said at least one edge region; said conductors of said conductor layout respectively having exposed ends terminating in a slot-shaped opening of said supporting film at said at least one edge region, said slot-shaped opening lying inwardly of an outer edge of said supporting film at said at least one edge region, said exposed ends being exposed to permit contact with said integrated circuit substrate edge contacts; and an additional slot-shaped opening having said conductors extending across it, said additional slot-shaped opening also being positioned at said at least one edge region and inwardly of said slot-shaped opening, the slot-shaped opening and the additional slot-shaped opening being located for respective positioning at upper and lower corners of said side of said substrate where said at least one edge region is folded up, over and around.