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Novel rework techniques for electronic assemblies

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conference contribution
posted on 09.02.2009, 13:04 by A.D. Stennett, David Whalley
Soft soldering is the primary joining technology used in electronics assembly and is expected to remain so for the foreseeable future. Component removal for rework and repair is traditionally achieved by remelting of the solder, but the exposure of the assembly or its component parts to repeated soldering/desoldering cycles may cause both immediate damage and create a significant long term reliability hazard. Rework is also currently labour intensive and requires skilled operators. Area array components, such as ball grid arrays (BGAs), further increase rework process complexity due to the number and inaccessibility of the solder joints and, for some devices, the necessity to remove and replace the solder balls before component replacement. There is also a growing requirement to recycle/reclaim electronic waste, creating the need for an effective process for dismantling of printed circuit board assemblies (PCBAs). This paper presents a brief review of alternative nonthermal techniques for rework or dismantling of conventional soldered assemblies, including both chemical etchants and mechanical techniques. Results are then presented on trials of chemical etchants, where solder removal rates consistent with realistic times for component removal have been readily achieved using commercially available tin-lead strippers. Electrochemical techniques are also shown to be usable in specific applications, i.e. where electrical contact can be readily made to the solder joints to be removed and have the advantage of reclaiming the removed solder directly from the electrolyte

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

STENNETT, A.D. and WHALLEY, D.C., 1998. Novel rework techniques for electronic assemblies. IN: Proceedings of the IEEE 2nd Electronics Packaging Technology Conference, Singapore, 8-10th December 1998, pp. 196-201

Publisher

© IEEE

Version

VoR (Version of Record)

Publication date

1998

Notes

This is a conference paper [© IEEE]. It is also available from: http://ieeexplore.ieee.org/xpl/RecentCon.jsp?punumber=6121. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

ISBN

078035141X

Language

en

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