Analyses of Delamination Arrest Effect of Dimples on Interface in LSI Package

概要

論文の詳細を見る
The delamination arrest between die pad and resin should be an efficient method to prevent resin cracking of LSI packages. In some LSI packages, dimples arranged on the die pad are effective for delamination arrest. In this study, the effects of dimples on delamination arrest are examined based on boundary element analyses of LSI packages under conditions of thermal and steam pressure loading. To evaluate this effect, the stress intesity factor, K_i, for an interface crack was calculated using the contact between interface crack surfaces. The following main results were obtained. (1)The dimple decreases K_i under both thermal and steam pressure load conditions. (2)The main reason for decreasing K_i is to prevent shearing deformation between crack surfaces under thermal load conditions. Conversely, the reason for the decrease is the kinking of interface crack tips under steam pressure load conditions. (3)The effect of delamination arrest increases as the dimple depth increases.
一般社団法人日本機械学会の論文
1997-01-15