BAMFIT – A Rapid Test for Reliability of Heavy Wire Bonds

F&S BONDTEC - BAMFIT – A Rapid Test for Reliability of Heavy Wire Bonds
Drahtbond Pull Test

BAMFIT - Bondtec Accelerated Mechanical Fatigue Interconnect Testing

>> Special attention is paid to the quality of the bonds

>> Life of the bond has to be maximized. However, this is not quite trivial

>> The BAMFIT method measures the number of load changes until breakage

BAMFIT fracture image shows the different shape of the interface much more clearly
BAMFIT fracture image shows the different shape of the interface much more clearly

The Problem

Bond wire connections must hold for several decades and under high thermomechanical loads. The optimization of bond connections is currently being implemented with static pull and shear tests. Indications of the long-term reliability are only given by time-consuming load change tests and empirical values.

The Solution

To fill this gap, a highly-accelerated test method for determining the lifetime of bond wire connections has been developed and converted to an extremely fast automatic quality test using a state-of-the-art bond tester.

This makes it possible to determine an estimation of the fatigue behavior of bond wire feeders in a very short time.

Test Results

Comparison of shear test and BAMFIT results as part of a wire bonding parameter investigation

As part of an orienting experiment, 300 μm thick wires were bonded with two bond parameter settings. Subsequently, shear tests and BAMFIT tests were carried out. The scope of the investigation for the orienting experiment was initially limited to 10 bond sites to be tested.
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Improvement of a DoE for wire bonding process optimization

Process optimization in wire bonding begins with the(ideally systematic) adjustment of the bonding parametersand the determination of the bond quality on the basis of quantifiable parameters
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Machines for BAMFIT testing of heavy wire bonds

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