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Resonance frequency dependency of Thermal Interface Materials (TIM) under vibration

Increasing power and reduced component size so-called the miniaturization of control units, justifies a growing requirement for the improved Thermal Interface Materials (TIM) for transferring heat from a die to a heat-sink (so-called slug-up concept). In order to investigate the reliability of this concept, it is necessary to consider the thermomechanical and dynamic behavior of TIM on the attached components and under different loading conditions. In this paper, a new method for End-Of-Life (EOL) testing of the slug-up components under random vibration loading is proposed. The design of this test set-up allows the resonance frequency measurements of electronic packages which are covered by TIM. The EOL results for slug-up capacitors and corresponding failure modes are explained using and resonance frequency measurements. The experimental results are compared with numerical results by FE modeling of slug-up capacitors. The resonance frequency dependency of TIM and its influence on EOL estimation and corresponding failure modes are discussed.