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https://scholarbank.nus.edu.sg/handle/10635/154135
Title: | DEVELOPMENT OF DROP-TEST SIMULATION AND RELIABILITY CHARACTERIZATION FOR IC PACKAGES | Authors: | EDI ANTO | Keywords: | BGA solder joints board-level drop test Finite Element Analysis impact reliability acceleration SMD |NSMD |
Issue Date: | 2004 | Citation: | EDI ANTO (2004). DEVELOPMENT OF DROP-TEST SIMULATION AND RELIABILITY CHARACTERIZATION FOR IC PACKAGES. ScholarBank@NUS Repository. | Abstract: | Drop impact induced failure, one of the most dominant failure modes for portable electronic products can cause housing damage, components failure and interconnects cracking. It is common that failure modes exist with the damage of the inside small components or tiny structures within the product. The solder joint interconnects have been identified as one of the weakest points within IC packages in these products. Due to small in dimension of these solder joints, it makes it difficult, costly and time-consuming to conduct drop impact test to investigate the failure mechanism and identify their drop impact behaviors. A board-level drop impact test simulation methodology has been established to assess the solder joints reliability on 2nd level packaging. Implementation of the methodology in BGA package with different pad designs and unconventional polymer core-enhanced solder ball had been carried out. It was found that the SMD design tends to result in higher stress concentration at the solder joints. NSMD Design could demonstrate higher reliability compared to dimensional form encapsulating the pad with the solder. Polymer core-enhanced solder ball had also been shown to have no effect on reducing drop impact induced stresses. Extended studies on the effects of drop height, PCB thickness, package thickness, and solder diameter had also been carried out. The stresses induced at the solder joints increases with drop height, PCB thickness, package thickness, and solder size. | URI: | https://scholarbank.nus.edu.sg/handle/10635/154135 |
Appears in Collections: | Master's Theses (Restricted) |
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