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Which US Frequency is Best for Wirebonding?
Keywords: Wirebonding, Ultrasonic Frequency, Optimization
This paper discusses how to choose the optimum ultrasonic frequency for wirebonding thin gold or aluminum and heavy aluminum wires or ribbons. For different surface properties, wire thicknesses and bond pad parameters, it appears that no single US frequency is ideally suited. Rather, the main strategy we found is to use as high an US frequency as possible and as low as necessary, bearing in mind that at higher frequencies the parameter windows become considerably narrower.
Josef Sedlmair,
F&K Delvotec Bondtechnik GmbH
Ottobrunn, Munich D-85521,
Germany


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