Bonding wire characterization using automatic deformability measurement

Hang, Chunjin; Lum, I.; Lee, J.; Mayer, Michael; Wang, Chunqing; Zhou, Y.; Hong, S. J.; Lee, S. M.

doi:10.1016/j.mee.2008.05.008

Cited by 27 publications

(19 citation statements)

References 11 publications

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“…In this study, an innovative online procedure to obtain a measure of hardness in situ is used. 14,15 By measuring the amount of deformation of the Au ball caused by a fixed load from the wire bonder, a measure of the hardness can be obtained. The amount of deformation provides a measure of the relative hardness of the material being tested, with a softer material deforming more than a harder material.…”

Section: Procedures Overviewmentioning

confidence: 99%

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In Situ Studies of the Effect of Ultrasound During Deformation on Residual Hardness of a Metal

Lum

Hang

Mayer

et al. 2009

Journal of Elec Materi

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A method is developed using an ultrasonic wire bonder to systematically study in situ the effect of superimposed ultrasound during deformation on the residual hardness of a metal wire. The method is applied during ultrasonic ball bonding of Au wire. It is found that 69 mW applied ultrasonic power during deformation of the Au balls leads to lower residual hardness than similarly deformed Au balls without applied ultrasound; this may be beneficial in reducing defects in applications sensitive to bonding stresses. It is confirmed that, although samples deformed with applied ultrasound experience larger strain rates than samples deformed without, strain rate hardening (if it does exist) does not change the finding that ultrasound applied during deformation of Au leads to lower residual hardness.

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Section: Procedures Overviewmentioning

confidence: 99%

“…An innovative method is used in this study, where the online signals of the wire bonder are used to obtain a measure of the ball height. 14,15 The ESEC WB3100 records the z-position of the horn as given by an encoder (Fig. 2).…”

Section: Detailed Proceduresmentioning

confidence: 99%

In Situ Studies of the Effect of Ultrasound During Deformation on Residual Hardness of a Metal

Lum

Hang

Mayer

et al. 2009

Journal of Elec Materi

Self Cite

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show abstract

“…4b and d, respectively. This definition differs from that used in previous work 9 where deformability was defined as BH after a certain force applied and accounting for FAB size sample-to-sample variability. The new definition addresses FAB size variability and is more intuitive than the previous definition, where a larger number meant a less deformable FAB.…”

Section: Strength Of the Haz And Fab Deformabilitymentioning

confidence: 99%

“…For a detailed description of the online method, see Ref. 9. Figure 5 shows a schematic diagram of parts of the bondhead structure.…”

Section: Strength Of the Haz And Fab Deformabilitymentioning

confidence: 99%

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Comparison of Insulated with Bare Au Bonding Wire: HAZ Length, HAZ Breaking Force, and FAB Deformability

Song

Hang

Pequegnat

et al. 2009

Journal of Elec Materi

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Two types (A and B) of 25-lm-diameter bare Au bonding wire and their corresponding insulated wire were used to produce 50-lm-diameter free-air balls (FABs) for heat-affected zone (HAZ) and FAB deformability analyses. Insulated wires showed no significant difference in HAZ length compared with bare wire for type A, while their difference lay in the range of 4% to 12% longer for type B. The HAZ breaking load of bare wire is 0.3% to 1.8% smaller than that of insulated wire for type A and not significantly different for type B even though the HAZ length is shown to be larger for insulated wire B. The deformability of the FAB from insulated wires is 1.0% to 2.1% smaller than that from bare wires for type A and 2.1% to 3.4% larger for type B.

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Effect of EFO parameters on Cu FAB hardness and work hardening in thermosonic wire bonding

Pequegnat

Hang

Mayer

et al. 2009

J Mater Sci: Mater Electron

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Bonding wire characterization using automatic deformability measurement

Cited by 27 publications

References 11 publications

In Situ Studies of the Effect of Ultrasound During Deformation on Residual Hardness of a Metal

In Situ Studies of the Effect of Ultrasound During Deformation on Residual Hardness of a Metal

Comparison of Insulated with Bare Au Bonding Wire: HAZ Length, HAZ Breaking Force, and FAB Deformability

Effect of EFO parameters on Cu FAB hardness and work hardening in thermosonic wire bonding

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