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Gold Wire for Room Temperature Wedge-Wedge Bonding
Keywords: Wire bonding, Wedge-Wedge bonding, Coated Gold wire
In the past few years one trend in the automotive industry was the increase of electronics for various applications. Among them are driver assistance systems like park distance control, navigation system, electronic power steering and electric brake control. The actual needs for power electronics are a higher integration density as well as an expansion of the applicability. Examples are System in Package concepts or mechatronic systems. Nowadays integrated sensor technology, logic signals and control of high electrical currents have to be combined. Examples are temperature sensor substrates or base materials, special performance requirements of contacts and especially highest reliability. Most of those applications are currently using AlSi1 thin wires. For AlSi1 wires in the range of 20 to 50m diameter a fatigue break is a common failure mode. This failure may occur due to long time vibration of the device in a vehicle. With a new developed special gold wire this fatigue break behaviour could be solved. By using aluminium as a coating the gold wire becomes bondable at room temperature. Various reliability test results will be discussed as well as the general performance of room temperature wedge-wedge bonding for this aluminium coated gold wire. Special focus will be on the bonding parameters, which are different from both common AlSi1 wedge-wedge bonding and gold ball-wedge bonding. The properties of the aluminium coating before and after bonding will be described.
Tobias Mueller, Vice President Bonding Wires
W. C. Heraeus GmbH
Hanau, Hessia 63450,

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