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No-flow underfill flip chip assembly–an experimental and modeling analysis

No-flow underfill flip chip assembly–an experimental and modeling analysis

Lu, H., Hung, K.C., Stoyanov, S., Bailey, C. and Chan, Y.C. (2002) No-flow underfill flip chip assembly–an experimental and modeling analysis. Microelectronics Reliability, 42 (8). pp. 1205-1212. ISSN 0026-2714 (doi:10.1016/S0026-2714(02)00092-6)

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Abstract

In the flip-chip assembly process, no-flow underfill materials have a particular advantage over traditional underfill: the application and curing of the former can be undertaken before and during the reflow process. This advantage can be exploited to increase the flip-chip manufacturing throughput. However, adopting a no-flow underfill process may introduce reliability issues such as underfill entrapment, delamination at interfaces between underfill and other materials, and lower solder joint fatigue life. This paper presents an analysis on the assembly and the reliability of flip-chips with no-flow underfill. The methodology adopted in the work is a combination of experimental and computer-modeling methods. Two types of no-flow underfill materials have been used for the flip chips. The samples have been inspected with X-ray and scanning acoustic microscope inspection systems to find voids and other defects. Eleven samples for each type of underfill material have been subjected to thermal shock test and the number of cycles to failure for these flip chips have been found. In the computer modeling part of the work, a comprehensive parametric study has provided details on the relationship between the material properties and reliability, and on how underfill entrapment may affect the thermal–mechanical fatigue life of flip chips with no-flow underfill.

Item Type: Article
Additional Information: [1] First published online: 12 June 2002. [2] Published in print: August 2002.
Uncontrolled Keywords: computer simulation, curing, delamination, fatigue of materials, interfaces (materials), microelectronic processing, soldered joints; X ray microscopes, scanning acoustic microscopes, flip chip devices
Subjects: Q Science > QA Mathematics > QA76 Computer software
T Technology > T Technology (General)
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability Group
School of Computing & Mathematical Sciences > Department of Computer Systems Technology
School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:
Last Modified: 14 Oct 2016 09:01
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/770

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