Bond reliability of cost effective Au-Ag alloy wire

Tomohiro Uno*, Kohei Tatsumi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Highly-alloyed Au-Ag bonding wire could be effective in saving material costs. We investigated the effects of Ag alloying on ball formation, bond strength and bond reliability. Even with high Ag concentration (approx. 50at%), ball was formed spherically. Bond strength and ball deformability were good enough for IC's assembling when concentration of Ag was less than 30at%. Thermal reliability of bonds between Au-Ag wire and Al pad had the unique dependence of Ag concentration. Ball bonds of Au-14at%Ag yielded significant degradation through annealed. On the contrary bonds of Au-24at%Ag provided as good reliability as a commercial pure Au wire after annealed at 473K-1000h. The bond reliability has the connection with intermetallic growth as well as diffusion behavior at the bond interface. The growth of intermetallics was different from that of pure Au/Al bonds. Optimizing the Ag concentration in the wire was effective in improving the bond reliability.

Original languageEnglish
Pages (from-to)450-455
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1999 Dec 1
Externally publishedYes
EventProceedings of the 1999 International Symposium on Microelectronics - Chicago, IL, USA
Duration: 1999 Oct 261999 Oct 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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