Research status of laser reflow on solder bump forming of area array packages are introduced, and experimental analysis on laser reflow of PBGA solder ball is performed.
The maximum cumulative equivalent creep strain was located in inner solder ball and at the edge of silicon chip.
最大累积等效蠕变应变位于内层焊点,且在芯片边缘。
Furthermore, the effect of solder ball layout and stress relax buffer layer material on the fatigue life of solder joints is studied.
最后探测锡球配置方式和缓沖层材料性质对于锡球疲劳寿命的影响,以获得高可靠度的封装结构。
The study included three aspects, which are the resistance force appearing in the solder paste printing, the solder ball test and solder paste wetting test.
焊膏印刷性能试验研究以下三个方面:焊膏印刷时所受到的阻力,焊膏焊料球试验和润湿试验。
Laser bumping is advantageous for its flexibility especially when used for individual solder ball rework and small or medium production of BGA packages, yet it hasn't been vastly applied presently.