Conductive systems and devices including wires coupled to anisotropic conductive film, and methods of forming the same

Abstract

Methods and apparatus for eliminating wire sweep and shorting while avoiding the use of under-bump metallization and high cost attendant to the use of conventional redistribution layers. An anisotropically conductive (z-axis) conductive layer in the form of a film or tape is applied to an active surface of a die and used as a base for conductive redistribution bumps formed on the anisotropically conductive layer, bonded to ends of conductive columns thereof and wire bonded to bond pads of the die. Packages so formed may be connected to substrates either with additional wire bonds extending from the conductive redistribution bumps to terminal pads or by flip-chip bonding using conductive bumps formed on the conductive redistribution bumps to connect to the terminal pads. The acts of the methods may be performed at the wafer level. Semiconductor die assemblies may be formed using the methods.