Electrical conduction characteristics of solid metal anisotropic conductive adhesive particles
Electrical conduction characteristics of solid metal anisotropic conductive adhesive particles
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DOI：
10.1109/polytr.2004.1402752
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
G. Don;D. Whalley;Changqing Liu
中科院分区：
文献类型：
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作者：
G. Don;D. Whalley;Changqing Liu
各向异性导电粘合剂（ACA）已在细间距电子封装中使用了十多年，并在一系列利基应用中提供了高密度和低温粘合方法。在ACA组件中，单个颗粒充当电导体，为细间距电子互连提供电流路径。本文提出了一种用于某些ACA中的固体金属颗粒的导电特性的模型。通过这种ACA颗粒的传导是由部件和衬底焊盘与颗粒之间的接触引起的，该颗粒通过组装过程而变形。为了研究颗粒变形程度或变形程度对颗粒阻力的影响，定义了颗粒变形因子。从ACA颗粒的物理模型出发，建立了ACA颗粒电阻的数学模型，该模型是转化因子和颗粒几何形状的积分函数。MathCAD软件已被用于提供该功能的解决方案。根据这些数值解，颗粒转化越大，颗粒阻力将越低。总之，它表明，ACA颗粒阻力是由颗粒的转换和颗粒的几何形状。最后，电阻函数将解释变形的金属ACA颗粒的导电机制。
Anisotropic Conductive Adhesives (ACAs) have been used in fine pitch electronics packaging for over a decade and provide a high density and low temperature bonding method in a range of niche applications. In an ACA assembly, individual particles act as electrical conductors, providing current paths for fine pitch electronics interconnections. This paper presents a model of the electrical conduction characteristics of the solid metal particles used in some ACAs. Conduction through such ACA particles results from contact between the component and substrate pads and the particle, which is deformed by the assembly process. In order to investigate the effect of the extent of particle deformation, or transformation degree, upon the particle resistance, the particle transformation factor is defined. A mathematical model of the electrical resistance of an ACA particle, which is an integral function of the transformation factor and the particle geomehy, has been developed from a physical model of the ACA particle. MathCAD software has been used to provide solutions for this function. According to these numerical solutions, the greater the particle transformation, the lower the particle resistance will be. In conclusion, it is shown that the ACA particle resistance is determined by the particle transformation and the particle geometries. Finally, the resistance function will explain the conductive mechanism of a deformed metal ACA particle.