Fatigue testing method for fine bond wires in an LQFP package

Author(s)
B. Czerny, A. Mazloum-Nejadari, G. Khatibi, L. Weiss, M. Zehetbauer
Abstract

A mechanical testing setup was developed to study the fatigue response of fine thermo-sonic wire bond connection in low profile quad flat packages (LQFP). The testing set-up was designed to induce pre-defined multi-axial stresses in the wire bond loops of non-encapsulated packages in order to mimic their deformation behavior during the thermo-mechanical loading. Lifetime curves were obtained up to 1.0E7 loading cycles with fatigue failure occurring in the heat affected zone of the ball bond. The experimental fatigue data in combination with extended FEA provided the basis for a Coffin Manson lifetime model. The proposed fatigue testing procedure can be applied as a highly efficient method for evaluation of various wire bonded packages by using a limited number of test samples and simultaneous testing of several wire bonds.

Organisation(s)
Physics of Nanostructured Materials
Journal
Microelectronics Reliability
Volume
64
Pages
270-275
No. of pages
6
ISSN
0026-2714
DOI
https://doi.org/10.1016/j.microrel.2016.07.068
Publication date
09-2016
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
202015 Electronics, 103018 Materials physics
Keywords
Wire bond fatigue, Thermo-mechanical finite element analysis, Mechanical fatigue testing, Lifetime modelling, AL, RELIABILITY, LIFE
Portal url
https://ucris.univie.ac.at/portal/en/publications/fatigue-testing-method-for-fine-bond-wires-in-an-lqfp-package(bc1a9638-f129-44ad-afbe-0712260b53f2).html