Accelerative effect analysis of quantitative environmental stress screening

Abstract

Environmental stress screening is an effective method to eliminate the potential defects of electronic products. In order to improve the efficiency and effectiveness of environmental stress screening, the acceleration effect was derived and analyzed based on the quantitative environmental stress screening mathematical principles of GJB/Z34. Then the high-temperature aging, temperature cycling, and random vibration acceleration effect evaluation model was proposed, and the test times under conventional stress and accelerated stress were obtained respectively. Finally, the stress acceleration factor was calculated according to the test time between conventional stress and accelerated stress and an example given which proved that the screening was effective.