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Ultra-fine pitch stencil printing for a low cost and low temperature flip-chip assembly process

Ultra-fine pitch stencil printing for a low cost and low temperature flip-chip assembly process

Kay, Robert W., Stoyanov, Stoyan ORCID: 0000-0001-6091-1226, Glinski, Greg P., Bailey, Christopher ORCID: 0000-0002-9438-3879 and Desmulliez, Marc P.Y. (2007) Ultra-fine pitch stencil printing for a low cost and low temperature flip-chip assembly process. IEEE Transactions on Components and Packaging Technologies, 30 (1). pp. 129-136. ISSN 1521-3331 (doi:https://doi.org/10.1109/TCAPT.2007.892085)

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Abstract

This paper presents the results of a packaging process based on the stencil printing of isotropic conductive adhesives (ICAs) that form the interconnections of flip-chip bonded electronic packages. Ultra-fine pitch (sub-100-mum), low temperature (100degC), and low cost flip-chip assembly is demonstrated. The article details recent advances in electroformed stencil manufacturing that use microengineering techniques to enable stencil fabrication at apertures sizes down to 20mum and pitches as small as 30mum. The current state of the art for stencil printing of ICAs and solder paste is limited between 150-mum and 200-mum pitch. The ICAs-based interconnects considered in this article have been stencil printed successfully down to 50-mum pitch with consistent printing demonstrated at 90-mum pitch size. The structural integrity or the stencil after framing and printing is also investigated through experimentation and computational modeling. The assembly of a flip-chip package based on copper column bumped die and ICA deposits stencil printed at sub-100-mum pitch is described. Computational fluid dynamics modeling of the print performance provides an indicator on the optimum print parameters. Finally, an organic light emitting diode display chip is packaged using this assembly process

Item Type: Article
Uncontrolled Keywords: computational fluid dynamics (CFD), isotropic conductive adhesives (ICAs), organic light emitting diodes (OLED)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
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
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Last Modified: 30 Sep 2019 14:23
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/1075

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