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On the mode II popcorn effect in thin packages

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5 Author(s)
Alpern, P. ; Infineon Technologies AG, Munich, Germany ; Dudek, R. ; Schmidt, R. ; Wicher, V.
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Experiments were carried out using P-TQFP-176 packages to study the mode II popcorn effect in thin packages. The doming of the package backside was measured as a function of time and temperature. The measurements were performed using a line projection method. An "accelerated" increase in the doming was found to correlate with the onset of the package crack propagation. It was shown that when a constant critical doming angle is reached, package cracks begin to propagate toward the surface. This critical doming angle was found to be temperature independent between 170°C and 215°C. Furthermore the development of the package doming with time was described by a simple model based on the moisture diffusion from molding compound and die-attach material in combination with a bimaterial plate theory. The water content of the die-attach layer after preconditioning was calculated from the model and it was found to be in good agreement with the results of a three dimensional finite element simulation

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Components and Packaging Technologies, IEEE Transactions on  (Volume:25 ,  Issue: 1 )