关键词: 随机振动, 引脚, 寿命预测, 底部填充, 可靠性

Abstract: In order to solve the reliability problem of QFP package in random vibration environment, the finite element analysis of three reinforcement methods, namely underfill, corner reinforcement, and underfill combined with corner reinforcement, combined with the S-N fatigue curve of the pin, calculated the random vibration life prediction, and analyzed the stress distribution and failure law of the pin of the package device by different reinforcement methods. The results show that the primary molding part of the corner position of the device is the most likely to fail in the two methods of underfilling, underfilling and four-corner reinforcement, and the stress concentration at the one-time molding place of the middle position of the four-corner reinforcement device is significant. The device is not ruggedized, and the pin life of the four corners reinforcement, underfilling, and underfilling combined with the four corners reinforcement is 3.23×10³, 3.15×10⁶, 4.33×10⁸, 2.87×10¹² cycles, respectively, and the three reinforcement methods can improve the pin life. The effect of underfill is better than that of corner reinforcement; Underfill and corner reinforcement can greatly improve pin life.

Key words: random vibration, pin, life prediction, bottom filling, reliability