The major issues in recent semiconductor packaging is to make 'highly reliable and environmental friendly semiconductor package'. Especially the demand of Cu based leadframe package which has low cost solution and higher thermal performance is increas...
The major issues in recent semiconductor packaging is to make 'highly reliable and environmental friendly semiconductor package'. Especially the demand of Cu based leadframe package which has low cost solution and higher thermal performance is increasing rapidly. So the study on highly reliable and environmental friendly semiconductor package is widely performing in many organizations, companies and countries around the world. The severity of package delamination has been stand for packaging reliability but there are still problems to be solved. Regarding to the environmental friendly semiconductor package, a lot of restrictions and regulations are already taken effect and/or waiting for the enforcement to restrict the use of hazardous substances in human body and environment. The RoHS (Restriction of Hazardous Substance) is one of the key regulations by restricting 6-kinds of hazardous substances like as Mercury, Cadminum, Hexavalent chromium, Polybrominated diphenyls (PBBs), Polybrominated diphenyl ethers (PBDEs) and Lead. The lead is one of most widely used substances in semiconductor packaging to plated the Cu surfaces and to do board mounting. So the restriction of lead can change packaging assembly process conditions and also be a motivation to find out another materials to make environment friendly package.In this study, the reliability of semiconductor packaging was evaluated by using QFN (Quad Flat No-lead) package which were assembled with different surface plating schemes. Ag plated strip on Cu based material and Ni/Pd/Au-Ag alloy plated strip on Cu based material were used in QFN package assembly. Before the assembly, surface analysis was conducted to analysis the surface morphology by using SEM and TEM method. In surface analysis, 50 hours and 100 hours bake test was also conducted at 200'C to evaluated the change of surface morphology in high temperature. After the QFN package assembly, MSL (Moisture Sensitivity Level) was evaluated with SAM (Scanning Acoustic Microscopy) method and JEDEC's MSL guidance. The contact angle test was also performed to see the relation of contact angle and MSL performance.