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JWJ > Volume 30(6); 2012 > Article
Journal of KWJS 2012 December;30(6) :113-119.
Published online December 23, 2012.
doi:https://doi.org/10.5781/KWJS.2012.30.6.113
Design by Topology Optimization and Performance Test of Ultrasonic Bonding Module for Flip-Chip Packaging
Ji Soo Kim*, Jong Min Kim*, Soo Il Lee**
*Dept. of Energy and Environmental System Engineering, University of Seoul, Seoul 130-743, Korea
**Dept. of Mechanical and Information Engineering, University of Seoul, Seoul 130-743, Korea
Correspondence: Soo Il Lee  Email: leesooil@uos.ac.kr
  Published online December 23, 2012
ABSTRACT
Ultrasonic bonding is the novel packaging method for flip-chip with high yield and low-temperature bonding. The bonding module is a core part of the bonding machine, which can transfer the ultrasonic energy into the bonding spot. In this paper, we propose topology optimization technique which can make new design of boding modules due to the constraints on resonance frequency and mode shapes. The designed bonding module using topology optimization was fabricated in order to evaluate the bonding performance and reliable operation during the continuous bonding process. The actual production models based on the proposed design satisfied the target frequency range and ultrasonic power. The bonding test was performed using flip-chip with lead-free Sn-based bumps, the results confirmed that the bonding strength was sufficient with the designed bonding modules. Also the performance degradation of the bonding module was not observed after the 300-hour continuous process with bonding conditions.
Keywords: Ultrasonic flip-chip bonding | Topology optimization | Bonding test
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