Patent ID: 6758385
Filing Date: 2004-07-06
Classification: G01N,H01L

Abstract:
An apparatus for performing a pull test in order to determine tensile strength of a bonding wire connection comprising a bonding wire loop between two bonding contacts on a substrate, the apparatus comprising:a drive rod with a tension hook positioned at an end thereof that can be controllably inserted under the wire loop; a drive device that is connected to the tension hook and generates a tensile force along a tensile force vector (F) directed substantially perpendicular to the substrate surface; a force-measurement device comprising at least one load cell disposed coaxially with the drive rod and associated with the tension hook, to detect the tensile force at each moment; a recording device engaged with the force-measurement device in order to record a pull-off strength value for the bonded-wire connection, wherein the force-measurement device is disposed substantially coaxially with the tensile force vector (F); a detector to detect the highest point of the bonding wire loop; and a position controller adapted for automatic positioning of the tension hook, and hence the point of origin of the tensile force vector, below the highest point of the bonding wire loop.