Abstract
In this study the effect of bonding pressure on the reliability of adhesive flip chip joints was evaluated. Two different substrates were used: rigid FR-4 board and flexible liquid crystal polymer (LCP) board. The reliability of the test samples was studied in a temperature cycling test, carried out between temperatures of -40 °C and 125 °C. To determine the exact time of a failure the resistance of each test sample was measured using continuous real-time measurement. A clear difference between different substrates was observed in the test. Cross sections of the samples were made in order to analyse the failure mechanisms.
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