Environmental factors affecting package crack occurrence are: • -humid atmosphere and time; • -soldering heat method and the number of times; • -heating temperature and time, etc. As mounting styles have become diversified, the above environmental conditions have been included in customer's quality requirements. Therefore, reasonable soldering heat evaluation methods are required. This paper demonstrates that resistance to package crack of a package made of a highly adhesive mold resin can be explained in terms of the Interface moisture content and maximum temperature applied to the package only.
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