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This disclosure described a simple and cost effective universal
heat sink test fixture. The universal fixture is a general purpose tool for
testing the shear strength of the heat sink to module attachment.
English (United States)
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This is the abbreviated version, containing approximately
74% of the total text.
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Universal Heat Sink Test Fixture
Heat Sink to Chip Module attachment is a process that needs to be qualified periodically and when it is a new process. The key qualification test includes finding the shear strength of the module and the heat sink joint. Usually we conduct a tensile test using for example Instron test machine. The Instron test machine requires a specific fixturing and trained personal.
Here, we proposed a Universal\General Purpose tool for testing the shear strength of the heat sink to module attachment. The technical benefit of this proposed tool is to minimize or avoid breakage of the chip especially for a small chip to large heat sink joint. There are several advantages of the proposed disclosure
Inexpensive Consistent test - Universal fixture make the test repeatable No need for special set up or fixturing Area - No limitation. Chip area can be as small as 6 x 6 mm (bare chip) to as large as 2 x 2 in (capped modules)
Shear Strength 600 psi - 1000 psi Loading can be varied from 1 lb min to @ 70 lbs max. Recent trend towards using lidless modules due to cost. This fixture would be ideal for low force applications. Plots of load Vs shear stress can be made for different areas for easy reference Mfg. operators and technician can easily use fixture with little training.
Spring loaded Screw
Loading Adjustment Screw
Heat Sink Holder
Up and down adjustment
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