Patent ID: 8574959

Claim:
A method of making a semiconductor device, comprising: providing a semiconductor die including a plurality of composite interconnects formed over a surface of the semiconductor die, each one of the composite interconnects including a fusible portion and non-fusible copper column that is exposed with respect to the fusible portion; providing a substrate; forming a plurality of conductive traces with interconnect sites over the substrate, each interconnect site having a width less than half a width of the composite interconnects; bonding the fusible portion of each one of the composite interconnects to each one of the interconnect sites with thermocompression by applying a force to mechanically deform the fusible portion to cover a top surface and side surface of each one of the conductive traces with interconnect sites and then heating the fusible portion of each one of the composite interconnects to a reflow temperature of the fusible portion; and depositing an encapsulant around the composite interconnects between the semiconductor die and substrate.