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The heater block and clamp determine the mechanical stability of the die during wirebonding. Mechanical stability is the foremost requirement to attain optimum ball bonds. The application of conventional heater block and clamp design on lead frames with short tie bars can apply an excessive pressure on the tie bar, resulting in die paddle flexing. In this study, the clamp design was modified to include a tie bar relief that eliminates flexural stress on the tie bar, allowing the clamp to hold the die for wirebonding without overclamping or paddle flexing. This enhanced heater block and clamp design reduced the occurrence of in-process ball lifting.
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