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GAISER TOOL COMPANY

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GAISER CAPILLARY INFORMATION

14. BALL BONDING PROBLEMS

GTC Figure 52

Figure 52. Several reasons can lead to the cratering of the bond pads. Some of them are:

bullet Excessive power setting
bullet Work piece movement during bonding
bullet Adhesion of the metallization to active device (Note: this is not true cratering.)
bullet Bond time is too long
bullet Bond stage temp is too high
bullet Bond pad metallization is too hard and/or thin

Figure 53. Necking above the ball bond can occur for several reasons:

bullet Insufficient force on the tool allowing the ball to wobble during scrubbing
bullet Free-air ball size too small, which is captured within the inside chamfer
bullet Incorrect percent elongation of the wire allowing the wire to work harden during formation

Get the BASIC CAPILLARY BONDING and DESIGN document in BASIC CAPILLARY BONDING/ DESIGN format

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