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Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame

Several candidate alloys have been suggested as high-temperature lead-free solder for Si die attachment by different researchers. Among them, Zn-Al based alloys have proper melting range and excellent thermal/electrical properties. In this study, Zn-Al-Mg-Ga solder wire was used to attach Ti/Ni/Ag m...

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Main Authors: Haque, A., Lim, B.H., Haseeb, A.S. Md. Abdul, Masjuki, Haji Hassan
Format: Article
Published: Springer 2012
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.um.edu.my/5453/
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spelling my.um.eprints.54532019-04-16T02:51:50Z http://eprints.um.edu.my/5453/ Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame Haque, A. Lim, B.H. Haseeb, A.S. Md. Abdul Masjuki, Haji Hassan TA Engineering (General). Civil engineering (General) Several candidate alloys have been suggested as high-temperature lead-free solder for Si die attachment by different researchers. Among them, Zn-Al based alloys have proper melting range and excellent thermal/electrical properties. In this study, Zn-Al-Mg-Ga solder wire was used to attach Ti/Ni/Ag metallized Si die on Cu lead-frame in an automatic die attach machine. Die attachment was performed in a forming gas environment at temperature ranging from 370 to 400 A degrees C. At the interface with Cu lead-frame, CuZn(4), Cu(5)Zn(8) and CuZn intermetallic compound (IMC) layers were formed. At the interface with Si, Al(3)Ni(2) IMC formed when 200 nm Ag layer was used at the die back and AgZn and AgZn(3) IMC layers when the Ag layer was 2,000 nm thick. Microstructure of the bulk solder consists of mainly two phases: one with a brighter contrast (about 80.9 wt Zn) and the other one is a mixture of light (about 73.7 wt Zn) and dark phases (about 45 wt Al). Zn-Al-Mg-Ga solder wetted well on Cu lead-frame, covered entire die area and flowed in all directions under the Si die. Less than 10 voids were found in the die attach samples at die attach temperatures of 380 and 390 A degrees C. Die shear strength was found within the acceptable limit (21.8-29.4 MPa) for all the die attach temperatures. Die shear strength of standard Pb-Sn solder was also measured for comparison and was found to be 29.3 MPa. In electrical test, maximum deviation of output voltage after 1,000 thermal cycles was found 12.1. Springer 2012 Article PeerReviewed Haque, A. and Lim, B.H. and Haseeb, A.S. Md. Abdul and Masjuki, Haji Hassan (2012) Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame. Journal of Materials Science: Materials in Electronics, 23 (1). pp. 115-123. ISSN 0957-4522
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Haque, A.
Lim, B.H.
Haseeb, A.S. Md. Abdul
Masjuki, Haji Hassan
Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame
description Several candidate alloys have been suggested as high-temperature lead-free solder for Si die attachment by different researchers. Among them, Zn-Al based alloys have proper melting range and excellent thermal/electrical properties. In this study, Zn-Al-Mg-Ga solder wire was used to attach Ti/Ni/Ag metallized Si die on Cu lead-frame in an automatic die attach machine. Die attachment was performed in a forming gas environment at temperature ranging from 370 to 400 A degrees C. At the interface with Cu lead-frame, CuZn(4), Cu(5)Zn(8) and CuZn intermetallic compound (IMC) layers were formed. At the interface with Si, Al(3)Ni(2) IMC formed when 200 nm Ag layer was used at the die back and AgZn and AgZn(3) IMC layers when the Ag layer was 2,000 nm thick. Microstructure of the bulk solder consists of mainly two phases: one with a brighter contrast (about 80.9 wt Zn) and the other one is a mixture of light (about 73.7 wt Zn) and dark phases (about 45 wt Al). Zn-Al-Mg-Ga solder wetted well on Cu lead-frame, covered entire die area and flowed in all directions under the Si die. Less than 10 voids were found in the die attach samples at die attach temperatures of 380 and 390 A degrees C. Die shear strength was found within the acceptable limit (21.8-29.4 MPa) for all the die attach temperatures. Die shear strength of standard Pb-Sn solder was also measured for comparison and was found to be 29.3 MPa. In electrical test, maximum deviation of output voltage after 1,000 thermal cycles was found 12.1.
format Article
author Haque, A.
Lim, B.H.
Haseeb, A.S. Md. Abdul
Masjuki, Haji Hassan
author_facet Haque, A.
Lim, B.H.
Haseeb, A.S. Md. Abdul
Masjuki, Haji Hassan
author_sort Haque, A.
title Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame
title_short Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame
title_full Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame
title_fullStr Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame
title_full_unstemmed Die attach properties of Zn-Al-Mg-Ga based high-temperature lead-free solder on Cu lead-frame
title_sort die attach properties of zn-al-mg-ga based high-temperature lead-free solder on cu lead-frame
publisher Springer
publishDate 2012
url http://eprints.um.edu.my/5453/
_version_ 1643687580507570176
score 13.211869

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