Enhanced Polymer Passivation Layer for Wafer Level Chip Scale ...

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102. Solder mechanics, a state of the art assessment, D. R. Frear, TMS, 1991 103. Creep and Stress Relaxation in Solder Joints, Hall PM, In: Lau JH, editor. Solder joint reliability theory and applications. New York: Van Nostrand Reinhold, P313,1991 104. Integrated Matrix Creep: Application to accelerated testing and lifetime prediction, Knecht S, Fox L, In: Lau JH, editor. Solder joint reliability theory and applications. New York: Van Nostrand Reinhold, 1991 105. Solder joint reliability of chip array BGA, Syed A, In: Pan Pacific Microelectronics Symposium, Maui. 1998 106. Constitutive and Damage Model for Solders, Stolkarts V, In: Electronic Components and Technology Conference, P379–385,1998 107. Solder Creep-fatigue Analysis by an Energy-partitioning Approach, Dasgupta A, ASME Journal of Electronic Packaging 114:152–60,1992 108. Experimental Correlations of An Energy-based Fatigue Life Prediction Method for Solder Joints, Akay H, In: Advances in Electronic Packaging, Proceedings of the Pacific Rim/ASME International Intersociety Electronic and Photonic Packaging Conference INTERpack’97, vol. 2. P1567–74,1997 109. An Integrated Fatigue Life Prediction Methodology for Optimum Design and Reliability Assessment of Solder Interconnections, Liang J, In: Advances in Electronic Packaging, Proceedings of the Pacific Rim/ASME International Intersociety Electronic and Photonic Packaging Conference INTERpack’97, vol. 2, P1583–92,1997 110. Reliability analysis for fine pitch BGA package, Wu SX, In: Electronic Components and Technology Conference, P737–41,1998 130
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Enhanced Polymer Passivation Layer
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SolderBrace coatings were low tempe
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Table of Contents Abstract ........
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4.4 Failure Analysis ..............
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List of Figures Figure 1.1 Trends i
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Figure 3.17 SAC305 Reflow profile .
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CHAPTER 1 INTRODUCTION In the era o
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This effect changes the package to
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1.4 Solder Joint Fatigue Figure 1.2
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leading to the solder joint failure
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umped wafers. The coating is stenci
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11 Bumped Wafer Print over ball Pre
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2.1 Chip Scale Package Technology C
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Mountable with conventional assembl
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Figure 2.3 Cross section of a typic
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Table 2.1 Comparison between tradit
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In-Situ Bumped Wafers Placed Prefor
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of solder joint failure, and they o
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(a) (b) Figure 2.8(a). Metalized ph
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"underfilled" structure distributes
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have generally been the modificatio
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are “low temperature” wafer lev
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2.3.4 Optimized SolderBrace Materia
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CHAPTER 3 WLCSP DIE FABRCIATION In
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Table 3.1 Test Die used for Reliabi
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Figure 3.4 Fabrication Process Flow
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spin coating. A layer of light sens
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layer, is investigated as a potenti
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10. Final cleaning: After the passi
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Cyclopentanone, a colorless liquid
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used to check the basic spin and ph
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Figure 3.7 SolderBrace film thickne
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6. Post-UV exposure bake: This step
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8. Pattern characterization: The su
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offers the optimum flux release cha
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fatigue resistance, lower cost SAC
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Figure 3.12 Solder Ball Placement M
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of solder balls to the holes on the
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of thermal shock. If the temperatur
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Figure 3.17 SAC305 Reflow profile -
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foaming and high performance cleane
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- Polish clean: used the optimized
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Figure 3.22 SolderBrace printed waf
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Voids Figure 3.25 SolderBrace Mater
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cutting speed was set at a low valu
Page 91 and 92: Figure 4.2 Process Flow of Board As
Page 93 and 94: pitch, and bump diameter), and subs
Page 95 and 96: 4.2.4 X-Ray Inspection Figure 4.5 R
Page 97 and 98: Figure 4.6 Air to air thermal cycli
Page 99 and 100: Figure 4.7 Thermal Cycling Setup 87
Page 101 and 102: 4.4 Failure Analysis The main purpo
Page 103 and 104: Figure 4.10 Pad cratering failure o
Page 105 and 106: CHAPTER 5 FINITE ELEMENT ANALYSIS I
Page 107 and 108: 5.1.1 Modeling Approaches Due to th
Page 109 and 110: are shown in Figure 5.2. However, t
Page 111 and 112: 5.1.2 Material Properties Many pack
Page 113 and 114: strain rate sensitivity. The evolut
Page 115 and 116: Morris et a1 [96] used a double pow
Page 117 and 118: focus on the time-dependent effects
Page 119 and 120: 5.2 Modeling Procedure In this proj
Page 121 and 122: Figure 5.6 The diagonal symmetry mo
Page 123 and 124: 5.2.3 Meshing Table 5.2 Anand const
Page 125 and 126: direction, but that the surface is
Page 127 and 128: PREP7 tref,398 ! set zero strain te
Page 129 and 130: 5.2.7 Thermal Fatigue Life Predicti
Page 131 and 132: CHAPTER 6 CONCLUSIONS Wafer level c
Page 133 and 134: References 1. Future Trends in Elec
Page 135 and 136: 23. Electronic Packaging and Interc
Page 137 and 138: 48. Ultra Low Stress and Low Temper
Page 139 and 140: 70. Factors for Successful Wafer-Le
Page 141: 92. Microstructural Dependendence o
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