Die Bonding of Devices with Copper Pillar Bumps Application

Flip chip technology is keeping pace with the increasing connection density of the ICs and is capable of transferring semiconductor performance to the printed circuit board. The pitch is growing smaller, which means flip chip technology with solder bumps will unavoidably run up against its technical limitations. The reason for this is the spherical geometry of the bumps. The solution to this problem is copper pillars. In this contact technology for flip chip assembly, special cylindrical copper connections function with a solder deposit instead of the usual solder ball bumps to form the connecting element between semiconductor and substrate. The result: improved reliability and enhanced electrical and thermal connection characteristics, greater connection density with narrow pitching and RoHS conformity.