Journal of Materials Science

, Volume 42, Issue 16, pp 6658–6664 | Cite as

The effect of bonding force on the electrical performance and reliability of NCA joints processed at a lowered temperature

  • Y. Ma
  • Y. C. ChanEmail author


The effect of the bonding force during flip chip-on-flex (FCOF) assembly on the electrical performance of the nonconductive adhesive (NCA) interconnects was investigated in this study, under the precondition of a reduced processing temperature in order to minimize thermally-induced damage to the low-cost flexible substrates. Pressure cooker tests (PCT) were performed to assess the reliability performance of the adhesive joints in high temperature and high humidity conditions. The assembly process was modified and the processing temperature and the bonding force were adjusted according to the experimental results to enable the use of low cost substrates, such as poly(ethylene terephthalate) (PET) materials in smart card fabrication.


Smart Card Bonding Temperature Electrical Performance Bonding Force Interfacial Delamination 
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The authors would like to thank the City University of Hong Kong for providing the research studentship, and the EPA Centre, the City University of Hong Kong for continued support.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Electronic EngineeringCity University of Hong KongKowloonHong Kong

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