bond shear

A process in which an instrument uses a chisel-shaped tool to shear or push a ball or wedge bond off the bond pad (see figure below). The force required to cause this separation is recorded and is referred to as the bond shear force. The bond shear force of a gold ball bond, when correlated to the diameter of the ball bond, is an indicator of the quality of the metallurgical bond between the gold ball bond and the bond pad metallization. The bond shear force of an aluminum wedge bond, when compared to the manufacturer's tensile strength of the wire, is an indicator of the integrity of the weld between the aluminum wire and the bond pad or package surface metallization.

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