Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Thermal Shock Reliability of Low Ag Composition Sn-0.3Ag-0.7Cu and Near Eutectic Sn-3.0Ag-0.5Cu Pb-free Solder Joints

Low Ag 조성의 Sn-0.3Ag-0.7Cu 및 Sn-3.0Ag-0.5Cu 무연솔더 접합부의 열충격 신뢰성

  • Hong, Won Sik (Physics-of-Failure Research Center, Korea Electronics Technology Institute) ;
  • Oh, Chul Min (Physics-of-Failure Research Center, Korea Electronics Technology Institute)
  • 홍원식 (전자부품연구원 고장물리연구센터) ;
  • 오철민 (전자부품연구원 고장물리연구센터)
  • Received : 2009.09.01
  • Published : 2009.12.20
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Abstract

The long-term reliability of Sn-0.3wt%Ag-0.7wt%Cu solder joints was evaluated and compared with Sn-3.0wt%Ag-0.5wt%Cu under thermal shock conditions. Test vehicles were prepared to use Sn-0.3Ag-0.7Cu and Sn-3.0Ag-0.5Cu solder alloys. To compare the shear strength of the solder joints, 0603, 1005, 1608, 2012, 3216 and 4232 multi-layer ceramic chip capacitors were used. A reflow soldering process was utilized in the preparation of the test vehicles involving a FR-4 material-based printed circuit board (PCB). To compare the shear strength degradation following the thermal shock cycles, a thermal shock test was conducted up to 2,000 cycles at temperatures ranging from $-40^{\circ}C$ to $85^{\circ}C$, with a dwell time of 30 min at each temperature. The shear strength of the solder joints of the chip capacitors was measured at every 500 cycles in each case. The intermetallic compounds (IMCs) of the solder joint interfaces werealso analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results showed that the reliability of Sn-0.3Ag-0.7Cu solder joints was very close to that of Sn-3.0Ag-0.5Cu. Consequently, it was confirmed that Sn-0.3Ag-0.7Cu solder alloy with a low silver content can be replaced with Sn-3.0Ag-0.5Cu.

Keywords

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