Browse Prior Art Database

BALL SHEAR CALIBRATION FIXTURE

IP.com Disclosure Number: IPCOM000005841D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-12
Document File: 1 page(s) / 54K

Publishing Venue

Motorola

Related People

Thomas A. Scharr: AUTHOR [+2]

Abstract

Ball shear testing is used to test the bond quality of the gold thermosonic ball bonds which are made to IC devices during the wire bonding assembly process. Ball shear testing is used for process wntrol, wire bonder set-up and qualifica- tion. It is used in conjunction with wire pull tests because it is a direct measurement of the bond area which may be 6-10 times greater then the cross-section of the wire tested during wire pull. Figure 1 shows the ball shear test method.

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MOTOROLA Technical Developments Volume 10 March 1990

BALL SHEAR CALIBRATION FIXTURE

by Thomas A. Scharr and Russell Lee

   Ball shear testing is used to test the bond quality of the gold thermosonic ball bonds which are made to IC devices during the wire bonding assembly process. Ball shear testing is used for process wntrol, wire bonder set-up and qualifica- tion. It is used in conjunction with wire pull tests because it is a direct measurement of the bond area which may be 6-10 times greater then the cross-section of the wire tested during wire pull. Figure 1 shows the ball shear test method.

   There are several types of ball shear testers available with internal calibration capabilities, These calibration methods are usually not run in the same mode as the actual shear test and in some cases do not give a direct response in grams force as in the actual shear test. The ball shear calibration fixture was developed so that the accuracy of shear force measurements taken with ball shear test equipment could be verified through an independent means. It is used with the ball shear tester in the same mode of operation as used when testing a bond. The ball shear calibration fixture can also be used to run gauge capability studies and to correlate ball shear testers at different locations.

   The ball shear calibration fixture consists of a mechanism to apply a known force to the shear tool and load cell Of the tester via a standardized calibration weight as shown in figure...