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RESEARCH PAPERS

Flip-Chip Underfill Packaging Considering Capillary Force, Pressure Difference, and Inertia Effects

[+] Author and Article Information
Chao-Ming Lin1

Department of Mechanical Engineering, WuFeng Institute of Technology, Chia-Yi, Taiwan 621, R. O. C.cmlin@mail.wfc.edu.tw

Win-Jin Chang

Department of Mechanical Engineering, Kun-Shan University, Tainan, Taiwan 710, R. O. C.

Te-Hua Fang

Institute of Mechanical and Electromechanical Engineering, National Formosa University, Yunlin, Taiwan 632, R. O. C.

1

Corresponding author.

J. Electron. Packag 129(1), 48-55 (May 13, 2006) (8 pages) doi:10.1115/1.2429709 History: Received September 03, 2005; Revised May 13, 2006

This study aims to enhance the flow rate and reduce the filling time in flip-chip underfill packaging by combining capillary force, pressure difference, and inertia effects. In the designed underfill apparatus, the capillary force effect is developed by surface tension, the pressure difference between the inlet and the outlet is established using a pump or a vacuum, and the inertia force is achieved via circular rotation. The governing equations containing the three analyzed effects are derived and solved using a dimensionless technique. The analytical results indicate that for the general gap height of approximately 101000μm, the pressure difference and inertia effects dominate the driving force and provide a significant reduction in the filling time. However, for a gap height of less than 1μm, the driving force is dominated by the capillary effect. The present results confirm that the productivity of the flip-chip underfill packaging process can be enhanced through the appropriate control of the capillary force, pressure difference, and inertia effects.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross section of traditional flip-chip underfill packaging

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Figure 2

Underfill packaging utilizing capillary, pressure difference, and rotation effects

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Figure 3

Combined driving force arising from capillary, pressure difference, and rotation effects

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Figure 4

Pressure drop across fluid–air interface in gap S for different fluids

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Figure 5

Variation of dimensionless time t* and velocity u* with x* curves for different Rp and We=0.1

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Figure 6

Variation of dimensionless time t* and velocity u* with x* curves for different Rp and We=1

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Figure 7

Variation of dimensionless time t* and velocity u* with x* curves for different Rp and We=10

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Figure 8

Variation of dimensionless time t* and velocity u* with x* curves for different Rp and We=100

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Figure 9

Variation of dimensionless time t* with different Rp and We in the filling end x*=1

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Figure 10

Variation of dimensionless velocity u* with different Rp and We in the filling end x*=1

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