Stencil Printing of Solder Paste for Fine‐pitch Surface Mount Assembly

1990 ◽  
Vol 2 (2) ◽  
pp. 10-14 ◽  
Author(s):  
J.R. Morris ◽  
T. Wojcik
Keyword(s):  
Solder Paste ◽  
Stencil Printing ◽  
Surface Mount ◽  
Fine Pitch

A Study of the Aperture Filling Process in Solder Paste Stencil Printing

1999 ◽  
Author(s):  
Jianbiao Pan ◽  
Gregory L. Tonkay
Keyword(s):  
Flip Chip ◽  
Deposition Process ◽  
Area Ratio ◽  
Solder Paste ◽  
Stencil Printing ◽  
Printing Process ◽  
Surface Mount ◽  
Fine Pitch ◽  
Main Indicator ◽  
Advanced Packaging

Abstract Stencil printing has been the dominant method of solder deposition in surface mount assembly. With the development of advanced packaging technologies such as ball grid array (BGA) and flip chip on board (FCOB), stencil printing will continue to play an important role. However, the stencil printing process is not completely understood because 52–71 percent of fine and ultra-fine pitch surface mount assembly defects are printing process related (Clouthier, 1999). This paper proposes an analytical model of the solder paste deposition process during stencil printing. The model derives the relationship between the transfer ratio and the area ratio. The area ratio is recommended as a main indicator for determining the maximum stencil thickness. This model explains two experimental phenomena. One is that increasing stencil thickness does not necessarily lead to thicker deposits. The other is that perpendicular apertures print thicker than parallel apertures.

scholarly journals Reliability Study of Solder Paste Alloy for the Improvement of Solder Joint at Surface Mount Fine-Pitch Components

Materials ◽  
2014 ◽  
Vol 7 (12) ◽  
pp. 7706-7721 ◽  
Author(s):  
Mohd Rahman ◽  
Noor Zubir ◽  
Raden Leuveano ◽  
Jaharah Ghani ◽  
Wan Mahmood
Keyword(s):  
Solder Joint ◽  
Solder Paste ◽  
Reliability Study ◽  
Surface Mount ◽  
Fine Pitch

The Impact of Stencil Printing Upon Assembly & Reliability Of 0.3mm Pitch CSP Components

2016 ◽  
Vol 2016 (1) ◽  
pp. 000667-000674
Author(s):  
Mark Whitmore ◽  
Jeff Schake
Keyword(s):  
Form Factors ◽  
Preliminary Test ◽  
Process Window ◽  
Solder Paste ◽  
Electronic Assembly ◽  
Stencil Printing ◽  
Printing Process ◽  
Fine Pitch ◽  
Technology Standard ◽  
The Impact

Abstract With the continual shrinking of electronic assembly form factors, designers are being forced towards smaller, more complex components with decreasing interconnection pitches. As a consequence, the Surface Mount assembly process is becoming increasingly challenged. For the stencil printing process, this means that historically accepted stencil aperture area ratio design rules, (which dictate what can or cannot be printed), need to be significantly pushed to extend the printing process for next generation ultra -fine pitch components. As a result, a major study has been undertaken looking at several different aspects of the stencil printing process, and their impact upon the assembly and reliability of 0.3mm pitch CSP components. In a preliminary test, stencil printing factors such as stencil aperture size and printing technology (standard squeegees vs ultrasonically aided active squeegees) were investigated. Data showed that the active squeegees provided a significantly larger process window. Subsequently, components were assembled using a range of solder paste volumes printed with both standard and active squeegee technology. The components assembled using an active squeegee process exhibited higher assembly yield, and also extended reliability when subjected to thermal cycling.

Developments in Stencil Printing Technology for 0.3mm Pitch CSP Assembly

2011 ◽  
Vol 2011 (1) ◽  
pp. 000502-000508 ◽  
Author(s):  
Mark Whitmore ◽  
Clive Ashmore
Keyword(s):  
Form Factor ◽  
Area Ratio ◽  
Transfer Efficiency ◽  
Solder Paste ◽  
Assembly Process ◽  
Next Generation ◽  
Stencil Printing ◽  
Printing Process ◽  
Fine Pitch ◽  
Solder Pastes

As electronics assemblies continue to shrink in form factor, forcing designers towards smaller components with decreasing pitches, the Surface Mount assembly process is becoming increasingly challenged. A new “active” squeegee printing process has been developed to assist in the stencil printing of solder pastes for next generation ultra fine pitch components such as 0.3mm pitch CSP’s. Results indicate that today’s accepted stencil area ratio rules, which govern solder paste transfer efficiency can be significantly pushed to extend stencil printing process capabilities to stencil apertures having area ratios as low as 0.4. Such a breakthrough will allow the printing of ultra fine pitch components and additionally will assist with heterogeneous assembly concerns, to satisfy up and coming mixed technology demands.

scholarly journals Critical Variables of Solder Paste Stencil Printing for Micro-BGA and Fine-Pitch QFP

2004 ◽  
Vol 27 (2) ◽  
pp. 125-132 ◽  
Author(s):  
J. Pan ◽  
G.L. Tonkay ◽  
R.H. Storer ◽  
R.M. Sallade ◽  
D.J. Leandri
Keyword(s):  
Solder Paste ◽  
Stencil Printing ◽  
Fine Pitch
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