Effects of stacked layers and stacked configurations on wire sweep and wire sag of advanced overhang/ pyramid stacked packages

[+] Author and Article Information
Huang-Kuang Kung

Professor, Institute of Mechatronic Engineering, Cheng Shiu University, Taiwan 83347, ROC

Chi-Lung Hsieh

Graduate student, Institute of Mechatronic Engineering, Cheng Shiu University, Taiwan 83347, ROC

1Corresponding author.

ASME doi:10.1115/1.4037276 History: Received April 13, 2017; Revised July 08, 2017


Overhang and/or pyramid stacked packages are the trend in the semiconductor industry. As the stacked layers increase drastically, the wire sweep and wire sag problems become more and more serious. Based on some types of frequently-used stacked configurations, their corresponding wire sweep and wire sag stiffnesses and deflections are investigated for extra-high stacked layers. Two typical profiles of Q_loop and S_loop wire bonds are included in this study. However, wire sweep and wire sag have to be considered in two different design aspects. For wire sweep, we have the conclusion that the maximum wire sweep deflections always occur near the central segment of a wire bond. As for the wire sag, the maximum wire sag may take place in the center region of the straight portion of a wire bond. The result shows that the deflections of wire sag can be reduced significantly by simply shifting the position of the kink or bend created within a wire bond. Finally, we have concluded that a stacked configuration with smallest bond span may be the preferred selection for the concerns of wire sweep and wire sag issues.

Copyright (c) 2017 by ASME
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