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VOLUME -25 NUMBER 6
Publication Date: 06/1/2010
Front Page News
People in the News
Electronic Mfg. Services
Electronic Mfg. Products
Special Features: Test and Measurement
Product Preview: Atlantic Design/MDM
June 2010 Issue
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Pressurex Pressure Sensor Film Aids Bond Strength
Sensor film reveals pressure variations.
Madison, NJ — When used in microelectronics, ultrasonic welding creates reliable bonds without introducing impurities or thermal distortion into components. Semiconductor devices, transistors and diodes are often connected by thin aluminum and gold wires using ultrasonic welding. It is also used for bonding wiring and ribbons as well as entire chips to microcircuits.
To optimize the weld and prevent defects, the horn and anvil must be precisely aligned during setup so that the horn exerts uniform pressure across the entire weld area. An economical and precise procedure that will ensure this outcome involves the use of Pressurex? pressure indicating sensor film.
Routine use of Pressurex
during the setup of ultrasonic welders helps ensure proper contact pressure and alignment between the horn and anvil, which results in welds of greater bond strength and aids in reducing rejected product and lowering base factory cost. Pressurex is an easy-to-use tool that reveals the distribution and magnitude of pressure between any two contacting surfaces. When placed between the horn and the anvil of the ultrasonic bonder, the film instantaneously and permanently changes color directly proportional to the actual pressure applied. The precise pressure magnitude (PSI or kg/cm
) is then easily determined by comparing color variation results to a color correlation chart — conceptually similar to interpreting Litmus paper. If desired, the film can be further analyzed. Pressurex is extremely thin (4 to 8 mils) and flexible, which enables it to conform to curved surfaces. Thus formed, these pressure maps show that there are pressure variations across the weld zone which can result in less than optimal weld strength. Such variations are generally caused by lack of alignment between the horn and anvil or by dirt or residue on the horn.
Contact: Sensor Products Inc., 300 Madison Avenue, Madison, NJ 07940
800-755-2201 or 973-884-1755 fax: 973-884-1699 E-mail: email@example.com Web:
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