TPT Wirebonder www.tpt.de Page 38 of 53 September 2016
33. Bumps without tail.
Go to standard Ball bond mode and program a standard Ball-Wedge bond.
To get a Bump without a tail you have to make a small groove to the wire at tip of the ball.
To get this small grove you have to make the second bond with very less parameters on the Ball.
Use a Tail between 400 and 500 and TableTear Mode.
Parameters for second Bond: 80 US / 200 Time / 150 Force
Use a Loop Program with: 100 Up / 100 Forward
Loop Program can be varied. Up to: 140 Up / 120 Forward
Second Bond parameters are critical for Bump height.
You have to try different Loop parameters and bond parameters to get a good and constant result.
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