Because it is difficult to accurately estimate the electric resistance of anisotropic conductive adhesive (ACA) joints, the ACA’s applications in high density packaging field have been greatly limited. The bulk resistance of particles is an essential part of the resistance of ACA joints. For the ACA using solid nickel (Ni) particles, because current flows along the spherical profile of the particles, the bulk resistance of these particles will be underestimated if the current bending effect is neglected. Here we propose a new method, which considers this current bending effect, to accurately evaluate the bulk resistance of Ni particles. First, a mathematical model to calculate the resistance of an arbitrary shaped resistor is deduced on the basis of electromagnetic theory. Second, a numerical model is introduced to calculate the potential distribution in the particles. Finally, the bulk resistance calculated by the new model is compared with the conventional methods. It is shown that the value obtained from this model is much higher than those calculated by other methods. Furthermore, the correlation studies between the bulk resistance and the particle’s diameter, the deformation degree, and the bonding force are carried out. And the results show that these three parameters influence significantly on the bulk resistance. In conclusion, to obtain accurate bulk resistance of ACA particles and make them stable and reliable, it is important to take the current bending effect into consideration and control the particle diameter and the bonding force properly.
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September 2012
Research-Article
Bulk Resistance Evaluation of Anisotropic Conductive Adhesive Particles Considering the Current Bending Effect
Bo Tao,
Bo Tao
1
e-mail: taobo@mail.hust.edu.cn
1Corresponding author.
Search for other works by this author on:
Z. P. Yin
Z. P. Yin
State Key Laboratory of Digital Manufacturing
Equipment and Technology,
School of Mechanical Science and Engineering,
Equipment and Technology,
School of Mechanical Science and Engineering,
Huazhong University of Science and Technology
,Luoyu Road 1037
,Wuhan, Hubei 430074
, China
Search for other works by this author on:
Bo Tao
e-mail: taobo@mail.hust.edu.cn
Z. P. Yin
State Key Laboratory of Digital Manufacturing
Equipment and Technology,
School of Mechanical Science and Engineering,
Equipment and Technology,
School of Mechanical Science and Engineering,
Huazhong University of Science and Technology
,Luoyu Road 1037
,Wuhan, Hubei 430074
, China
1Corresponding author.
Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received December 23, 2011; final manuscript received May 4, 2012; published online July 18, 2012. Assoc. Editor: How T. Lin.
J. Electron. Packag. Sep 2012, 134(3): 031007 (8 pages)
Published Online: July 18, 2012
Article history
Received:
December 23, 2011
Revision Received:
May 4, 2012
Citation
Chen, X. C., Tao, B., and Yin, Z. P. (July 18, 2012). "Bulk Resistance Evaluation of Anisotropic Conductive Adhesive Particles Considering the Current Bending Effect." ASME. J. Electron. Packag. September 2012; 134(3): 031007. https://doi.org/10.1115/1.4006889
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