I’m not an expert at wire bonding although I’ve done lab scale gold ball bonding before so I understand the basics of the process and I’ve never seen this deep an indent before. Could this be an indication of too much pressure or ultrasonic power? Would love comments from people who actually run high volume bonders as to whether this is indicative of poor process control, it sure seems fishy to me.
20 + 53.17 exp(-t/1414.43)
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