Wire Bonding

Levine, Lee I.

doi:10.31399/asm.edfa.2016-1.p022

Cited by 3 publications

(4 citation statements)

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“…For comparing the developed model with the experimental results, the relative deviations of the logarithm of the cycles to failure between all experimental data points and the corresponding model data are calculated; see Equation (3).…”

Section: Quantitative Comparison Of Experimental Data With Model Datamentioning

confidence: 99%

“…For the transmission of electrical signals and for the electrical connection in power electronic devices, high-purity aluminum bonding wires with diameters between 125 µm and 500 µm are often used [1]. The wires are processed into bridges by ultrasonic wedge-wedge wire bonding [2][3][4]. The combination of corrosive media and different cyclic mechanical and thermal stresses during operation can lead to fatigue loads on the wire bridges because of the different thermal expansion coefficients of different substrate materials [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Quantitative Comparison Of Experimental Data With Model Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Fatigue Lifetime Prediction Model for Aluminum Bonding Wires

Moers,

Dresbach,

Altenbach

2023

Metals

View full text Add to dashboard Cite

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“…Al-Prime is tested with R-ratios of 0.1, 0.4 and 0.7. The R-ratio is defined by the quotient of minimum stress σmin and maximum stress σmax, see Equation 1: R = σ min σ max (1) The wires were tested up to a maximum number of cycles between 1,000,000 and 10,000,000 cycles. Each fatigue experiment was evaluated by a Python TM routine according to DIN 50100:2016-12 [14].…”

Section: Fatigue Testingmentioning

confidence: 99%

“…Heavy bonding wires made of high-purity aluminum with diameters between 125 µm and 500 µm are the most used materials for the transmission of electrical signals and for the electrical connection in power electronic devices. More than 90% of the bonding wires are processed into bridges by wedge-wedge wire bonding [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of R-Ratio on Fatigue of Aluminum Bonding Wires

Moers

Dresbach

2022

Metals

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Bonding wires made of aluminum are the most used materials for the transmission of electrical signals in power electronic devices. During operation, different cyclic mechanical and thermal stresses can lead to fatigue loads and a failure of the bonding wires. A prediction or prevention of the wire failure is not yet possible by design for all cases. The following work presents meaningful fatigue tests in small wire dimensions and investigates the influence of the R-ratio on the lifetime of two different aluminum wires with a diameter of 300 µm each. The experiments show very reproducible fatigue results with ductile failure behavior. The endurable stress amplitude decreases linearly with an increasing stress ratio, which can be displayed by a Smith diagram, even though the applied maximum stresses exceed the initial yield stresses determined by tensile tests. A scaling of the fatigue results by the tensile strength indicates that the fatigue level is significantly influenced by the strength of the material. Due to the very consistent findings, the development of a generalized fatigue model for predicting the lifetime of bonding wires with an arbitrary loading situation seems to be possible and will be further investigated.

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