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|Effect of Vapor-Deposited Parylene Coating on Reliability of Sintered Silver Joints for 300° C Applications|
|Keywords: Paralyne HT coating, Ag sintering, MCM reliability|
|Silver nano-particle (AgNP) sintering has been shown to be an excellent bonding method for use in high-temperature multi-chip modules (rated above 200° C). Among the proven advantages of this material are its high strength of attachment joints, resilience to thermal cycles, low resistivity, and high thermal conductivity. One of the concerns related to sintered silver joints is electro-migration. Another concern is the change in microstructure under thermal stress. Vapor-deposited fluorinated parylene coating (Paralyne HT) may have the potential to mitigate those concerns because of its superior conformal and crevice-penetration properties. In this work, impact of Parylene HT on sintered silver joints has been evaluated from the perspective of mechanical strength. Test vehicles were subjected to thermal cycling, thermal shocks, and high-temperature aging. To understand failure mechanisms, shear tests and analysis of the cross sections and fracture surfaces were performed. In addition, the effectiveness of Parylene HT as a coating to inhibit electro-migration at high temperature was evaluated. Coated and uncoated sintered silver patterns were stressed with electrical field inside a high-humidity chamber. Progression of electro-migration was monitored and compared during the test. One of the findings was that the coating material penetrated completely into the pores of sintered silver joints, altering their mechanical performance under thermal stress. Analysis of the performance differences between coated and uncoated test vehicles is presented in the paper.|
|Zhenzhen Shen, MCM durability engineer