TY - GEN
T1 - Solderability of tinned FeNi under bump material
AU - Chen, Cai
AU - Zhang, Lei
AU - Shang, J. K.
PY - 2009
Y1 - 2009
N2 - Finding new under bump materials (UBM) is of significant importance with the shrinkage of pitch size in advanced high density packaging. FeNi alloy has been found to be a good UBM candidate for its slower interfacial reaction during reflow and aging. However, solderability of FeNi has to be improved. 58Fe42Ni and 92Fe8Ni alloy platings with electrodeposited tin finish were investigated by wetting balance method in a SnAgCu liquid bath. Results showed that tin finish can reduce the initial wetting time tb of 58Fe42Ni and change the non solderable 92Fe8Ni to be the same wetting performance as 58Fe42Ni. The maximum wetting force of tin finished both FeNi alloys were larger than the bare alloy. However, after the maximum was reached, a slight decline of the wetting force was observed. The decline depended on the thickness of tin finish, with the thicker tin finish resulting in a higher steady plateau on the wetting force curve.
AB - Finding new under bump materials (UBM) is of significant importance with the shrinkage of pitch size in advanced high density packaging. FeNi alloy has been found to be a good UBM candidate for its slower interfacial reaction during reflow and aging. However, solderability of FeNi has to be improved. 58Fe42Ni and 92Fe8Ni alloy platings with electrodeposited tin finish were investigated by wetting balance method in a SnAgCu liquid bath. Results showed that tin finish can reduce the initial wetting time tb of 58Fe42Ni and change the non solderable 92Fe8Ni to be the same wetting performance as 58Fe42Ni. The maximum wetting force of tin finished both FeNi alloys were larger than the bare alloy. However, after the maximum was reached, a slight decline of the wetting force was observed. The decline depended on the thickness of tin finish, with the thicker tin finish resulting in a higher steady plateau on the wetting force curve.
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U2 - 10.1109/ICEPT.2009.5270666
DO - 10.1109/ICEPT.2009.5270666
M3 - Conference contribution
AN - SCOPUS:70449972464
SN - 9781424446599
T3 - 2009 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2009
SP - 670
EP - 673
BT - 2009 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2009
T2 - 2009 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2009
Y2 - 10 August 2009 through 13 August 2009
ER -