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�������պ����ѧѧ�� 2010, Vol. 36 Issue (9) :1089-1093    DOI:
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���۴�, �� ��, ����ƽ, ����Ⱥ*
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Effect of humidity on storage reliability of plastic encapsulated microcircuits devices in hygrothermal environment
Liu Huicong, Xing Yang, Li Weiping, Zhu Liqun*
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� According to the storage reliability problems of plastic encapsulated microcircuits (PEM) devices in hygrothermal environment, effect of humidity on moisture absorption, surface estate and electrical performance of PEM was investigated through hygrothermal test. The results show that, humidity in the environment obviously affects moisture absorption process of PEM; Along with higher relative humidity at the same temperature, moisture absorption rate becomes bigger and moisture absorption content grows larger, but moisture has little effect on the time for moisture absorption content getting the biggest, moisture absorption content usually has the biggest value after 300�Zh; Corrosion of component leads was found to be a main failure mode of PEM in hygrothermal environment, and the components have higher corrosion grade if the relative humidity is higher, and the defects, cracks and pinholes on the leads are considered to be the corrosion susceptible sites of the devices; In the tested storage time, humidity in the environment has little effect on the electrical performance of PEM.
Keywords�� plastic encapsulation   electronic components   humidity   hygrothermal environment   storage reliability   corrosion     
Received 2009-06-15;


About author: ���۴�(1975-),Ů,�ӱ��޼���,��ʦ,liuhc@buaa.edu.cn.
���۴�, ����, ����ƽ, ����Ⱥ.ʪ�Ȼ�����ʪ�ȶ��ܷ���������ɿ��Ե�Ӱ��[J]  �������պ����ѧѧ��, 2010,V36(9): 1089-1093
Liu Huicong, Xing Yang, Li Weiping, Zhu Liqun.Effect of humidity on storage reliability of plastic encapsulated microcircuits devices in hygrothermal environment[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(9): 1089-1093
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