Patent ID: 6242815
Filing Date: 2001-06-05
Classification: H01L,H05K

Abstract:
A flexible substrate based ball grid array (BGA) package comprising:a flexible film substrate comprising a flexible film having opposing upper and lower surfaces, the upper surface of the flexible film having a chip attaching area;at least a dummy pad disposed centrally on the chip attaching area;a plurality of chip connection pads arranged about the periphery of the chip attaching area;a plurality of solder pads on the upper surface of the flexible film electrically connected to the corresponding chip connection pads, wherein the flexible film has a plurality of through-holes formed corresponding to the solder pads and the dummy pad is not electrically connected to the chip connection pads;a plurality of solder balls mounted to the solder pads of the flexible film substrate for making external electrical connection;a semiconductor chip securely attached onto the chip attaching area of the flexible film substrate, the chip having a plurality of bonding pads electrically connected to the corresponding chip connection pads; anda package body formed over the semiconductor chip and the upper surface of the flexible film substrate.