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Investigating the Effects of Lead Forming Parameters on Intermetallic Layer Crack Using the Finite-Element Method

Chin, J. W. C and Kok, C.K. and RAJMOHAN, M.M. and Yeo, V.S.H and SAID, M.R. (2012) Investigating the Effects of Lead Forming Parameters on Intermetallic Layer Crack Using the Finite-Element Method. Journal of ELECTRONIC MATERIALS, 41 (4). pp. 774-781. ISSN 0361-5235

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Abstract

The lead trim-and-form process is important in the manufacturing of programmable logic devices, microprocessors, and memories. Normally, inspection of a chip package is performed in a lead inspection machine after the lead forming process to detect defects on the leads. One such defect is the lead intermetallic compound (IMC) crack, exhibiting itself as plating crack. In this study, IMC crack of package leads, which causes loose connection between the copper lead and the tin plating, was analyzed using the finite-element method. The simulation results were verified by matching the simulated and actual formed lead profile. Simulation results showed a strong correlation between IMC crack after forming and aging and high residual tensile strain induced during lead forming. A proposal was made to resolve the crack issue by performing design of experiment (DOE) to reduce the residual tensile strain of the lead upon forming. Three optimization parameters were chosen, namely the forming angle, the shank angle, and the pre-forming angle. It is shown that, with the optimized parameter setting, a reduction of the residual strain can be achieved, thus minimizing the risk of IMC crack.

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Mechanical Engineering > Department of Structure and Materials
Depositing User: dr md radzai said
Date Deposited: 01 Feb 2013 03:27
Last Modified: 28 May 2015 02:40
URI: http://eprints.utem.edu.my/id/eprint/4147

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