Characterization of different wire bonding materials during passive thermal test

The role of heavy wire bonding in power modules is very important. They connect different parts within the module with each other, i.e. DBC to DBC, DBC to chip and DBC to frame are joined with bonding wires. They play a significant role in order to improve the overall module performance in terms of reliability and power capability. Therefore, new combinations of materials and technologies are used to produce a better heavy wire bonding, upgrading the mechanical and electrical characteristics properties of the wires. In order to evaluate the reliability, four different types of Al based bonding wire materials (5N-H11, 5N H11-CR, Al-PS and CucorAl 40/60) were compared with respect to temperature cycling capability.