Thermal Simulation into the Effect of Varying Encapsulant Media on Wire Bond Stress Under Temperature Cycling

Packwood, Matt; Li, Daohui; Mumby-Croft, Paul; Dai, Xiaoping

doi:10.1109/icept.2018.8480816

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Previous publications that focus on the reliability or lifetime prediction of aluminum bonding wires mainly deal with wire bridges and not with the wire material itself. The influence of the organic or inorganic encapsulation on the reliability of the wire bridges, for example, is evaluated in [12,13], while [14][15][16] perform accelerated mechanical fatigue tests to investigate the influence of thermo-mechanical shear stress on wire lift-offs. The changes in the microstructure near the bonding interface and crack propagation due to power cycling are investigated by [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Fatigue Lifetime Prediction Model for Aluminum Bonding Wires

Moers,

Dresbach,

Altenbach

2023

Metals

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Electrical signal transmission in power electronic devices takes place through high-purity aluminum bonding wires. Cyclic mechanical and thermal stresses during operation lead to fatigue loads, resulting in premature failure of the wires, which cannot be reliably predicted. The following work presents two fatigue lifetime models calibrated and validated based on experimental fatigue results of an aluminum bonding wire and subsequently transferred and applied to other wire types. The lifetime modeling of Wöhler curves for different load ratios shows good but limited applicability for the linear model. The model can only be applied above 10,000 cycles and within the investigated load range of R = 0.1 to R = 0.7. The nonlinear model shows very good agreement between model prediction and experimental results over the entire investigated cycle range. Furthermore, the predicted Smith diagram is not only consistent in the investigated load range but also in the extrapolated load range from R = −1.0 to R = 0.8. A transfer of both model approaches to other wire types by using their tensile strengths can be implemented as well, although the nonlinear model is more suitable since it covers the entire load and cycle range.

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