Patent ID: 7185420
Filing Date: 2007-03-06
Classification: B23K,H01L,Y10T

Abstract:
1. A thermal compression bonding apparatus comprising: a bonding head; a head contact surface coupled with the bonding head; a projecting ring with a recessed center coupled with the head contact surface, the bonding head to provide pressure and heat discriminately through contact of the ring against a heat dissipation device and therefore to reflowable thermal conductive interface material on a die back side adjacent the heat dissipation device, the interface material having a peripheral edge defining a center, the ring to substantially overlie the peripheral edge of the interface material opposite the heat dissipation device, the recessed center to substantially overlie the center of the interface material opposite the heat dissipation device, to produce thereby liquefaction followed by solidification of the interface material, the solidification occurring progressively from the center to the peripheral edge of the interface material wherein the heat dissipation device comprises copper having a plating of nickel, the nickel having a plating of gold, and the back side of the die having a plating of gold, the heat dissipation device gold plating and the die gold plating in contact with the interface material interface material; and a support base opposite the bonding head, the support base to support a carrier substrate to which the die is electrically coupled, the bonding head and support base in spaced apart relationship to accept a microelectronic package between the bonding head and the support base.