Method for Testing Bonding Connections
Provided is a method for assessing the production quality of bond connections using thermography. By applying a contouring it is possible to determine reliably and reproducibly the position-dependent temperature and the thermal time constants for each bond wire by using thermography. This also allows real-time monitoring of the bond connections and precise prediction of possible failures or defects.
Bonding is used particularly to connect the outwardly visible terminals in an electronic circuit to chip connectors via bonding wires, thereby creating contact points. When manufacturing such arrangements, it is important that the bond connections are correctly formed to guarantee the necessary current flow in operation.
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To ensure a good and stable bonding connection checks are carried out in spot-check manner with one or more bonding connections. For this, a “shear test” is employed to verify the mechanical stability of the bonded connections, but this method has the disadvantage that the arrangements get destroyed.
The aim of our invention was to provide a testing method and a testing apparatus, that both are simple and reliable, to determine if a correct bonding connection in a component arrangement has been formed, even in mass production.
Regarding the inventive method, the bonding connection is created between a bonding section of a bonding wire and a metal contact point. The bonding wire has a structured top-side surface in the region of the bonding section. Methods to structure the surface are described in DE102010038130. It can be recognized if the bonding connection has been produced correctly – in a way that the current flow necessary for operation as required by its function is guaranteed – by evaluating a thermogram that is provided by the testing apparatus. For testing the bonding connection, a specific voltage is applied to the bonding wire to heat the bonding connection, resulting in a specific thermogram.
Once the bonding connection was produced correctly – meaning that it is able to guarantee the current flow necessary for operation as required by its function – this can be seen by evaluating the thermogram.
- Online process control
- More precise forecast of potential defects or malfunctions
- Precise and reproducible control of each bonding wire
- Non-Destructive testing
This technology for testing heavy wire bonds can be used in the fabrication of electrical connections. Typically, wire bonding is used for connecting a so-called die to electrical connections of a chip housing, for example the semiconductors of an integrated semiconductor, a light emitting diode or a sensor.
Chances for Collaboration:
- R&D Cooperation
- Patent Purchase
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