| When a high frequency current passes through a bonding wire, the AC resistance of the bonding wire is generally larger than its DC resistance due to the skin effect, which leads to the discrepancy of the AC and DC fusing current. In this paper, a theory of AC electrothermal coupling of bonding wire is introduced firstly, considering the skin effect. Secondly, the AC electrothermal coupling simulation model of the gold bonding wire is established by using COMSOL Multiphysics finite element software. Lastly, the AC fusing current of the gold bonding wire is simulated by this model. The results show that when other conditions are equal, the AC resistance of the gold bonding wire is larger than the DC resistance, and increases as the frequency increases; the AC fusing current of the gold bonding wire is smaller than the DC fusing current, and decreases as the frequency increases. The simulation model and results can provide reference for the analysis of the AC fusing current of the gold bonding wire. |
