Ahmer Syed and WonJoon Kang
Amkor Technology, Inc.
1900 S. Price Road
Chandler, Arizona
ABSTRACT
There is a strong interest in understanding the surface mount assembly requirements of QFN (Quad Flat No-Lead) type packages due to their rapid industry acceptance. Board level reliability is also of great concern as this is a package without compliant leads. This paper provides guidelines in board design and surface mount of this package based on extensive surface mount experiments. Board level reliability data has also been generated for accelerated temperature cycling test conditions and is presented here. The data is generated for different material sets, various body/die sizes, temperature cycle conditions and board thickness. The data shows reliable surface mount process is achievable and the package is very reliable for most applications.
Source: http://www.amkor.com/products/notes_papers/Board_Level_QFN.pdf
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