Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Validation of sequence test method of Pb-free solder joint for automotive electronics

자동차 전장품용 무연솔더 접합부의 시리즈 시험 유효성

  • Kim, A Young (Robust Components & System Research Center, Korea Electronics Technology Institute) ;
  • Oh, Chul Min (Robust Components & System Research Center, Korea Electronics Technology Institute) ;
  • Hong, Won Sik (Robust Components & System Research Center, Korea Electronics Technology Institute)
  • 김아영 (전자부품연구원 시스템로버스트연구센터) ;
  • 오철민 (전자부품연구원 시스템로버스트연구센터) ;
  • 홍원식 (전자부품연구원 시스템로버스트연구센터)
  • Received : 2015.06.24
  • Accepted : 2015.06.25
  • Published : 2015.06.30
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Abstract

Due to environmental regulations (RoHS, WEEE and ELV) of the European Union, electronics and automotive electronics have to eliminate toxic substance from electronic devices and system. Specifically, reliability issue of lead-free solder joint have an increasing demand for the car electronics caused by ELV banning. The authors prepared engine control unit and cabin electronics soldered with Sn-3.0Ag-0.5Cu (SAC305). To compare with the degradation characteristics of solder joint strength, thermal cycling test (TC), power-thermal cycling test (PTC) and series tests were conducted. Series tests were conducted for TC and PTC combined stress test using the same sample in sequence and continuously. TC test was performed at $-40{\sim}125^{\circ}C$ and soak time 10 min for 1000 cycles. PTC test was applied by pulse power and full function conditions during 100 cycles. Combined stress test was tested in accordance with automotive company standard. Solder joint degradation was observed by optical microscopy and environment scanning electron microscopy (ESEM). In addition, to compare with deterioration of bond strength of quad flat package (QFP) and chip components, we have measured lead pull and shear strength. Based on the series test results, consequently, we have validated of series test method for lifetime and reliability of Pb-free solder joint in automotive electronics.

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References

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