• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/sadh/043/04/0059

    • Keywords

       

      Ball grid array; capillary underfill encapsulation; finite-volume method; incomplete filling; void formation.

    • Abstract

       

      Prediction of void occurrence during capillary underfill encapsulation process is vital to avoid package failure due to incomplete filling during the encapsulation process. Two design variables, namely the gap height and package orientations, together with different types of industrial standard design of dispensingmethods were identified as possible influences to the void formation in encapsulated package. In this paper, all these factors have been closely related to the void formation and subsequently the best chip design has beenformulated to improve package reliability. From the study, air entrapment is clearly visualized in the experiment, which can be detrimental as it contains trapped oxygen, which can combust at high temperature. A series of experiments eventually showed higher possibility of air void formation by U-type dispensing method compared with the L-type dispensing method. In addition, it is found that the chip design parameters that include the scaling size and ball grid array orientation have an effect on the size of void formed. Our experimental findingswere validated using lattice-Boltzmann method simulation and great consensus is found between both approaches. These findings provide additional insights to the electronic packaging developer to effectively reduce the formation of void during encapsulation process.

    • Author Affiliations

       

      AIZAT ABAS1 FEI CHONG NG1 Z L GAN1 M H H ISHAK1 M Z ABDULLAH2 GEAN YUEN CHONG1

      1. School of Mechanical Engineering, Engineering Campus, University of Science Malaysia, 14300 Nibong Tebal, Malaysia
      2. School of Aerospace Engineering, Engineering Campus, University of Science Malaysia, 14300 Nibong Tebal, Malaysia
    • Dates

       
  • Sadhana | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.