A SIMPLE FLEX-CSP AND ITS RELIABILITYAuthor: Yii-Tay Chiou
Company: Material Research Laboratories
Date Published: 1/25/2000 Conference: Pan Pacific Symposium
In the assessment of reliability, both short term (JEDEC Standard) and long term tests are conducted with the molded CSP samples. Level III of JEDEC (30ºC/60%RH, soaked for 192hrs) was implemented to confirm the IR reflow reliability of the samples. After 3 times of IR reflow( i.e., short term test), there is no additional delamination, crack or popcorning detected during the inspections of X-ray and Scanning Acoustic Topography (SAT). On the other hand, long term tests such as PCT Level C (121ºC/100%RH/15psi for 96hrs), PCT Level D (121ºC/100%RH/15psi for 168hrs) and TCT Level C (-65ºC ~ 140ºC for 1000 cycles), all showed that the interface delamination was growing but not more than 50% of its area. As the same case in the short term test, crack and popcorn were not found during X-ray and SAT inspections after long term tests.
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