Heatsink Clip Load Metrology
R
68 Thermal/Mechanical Design Guide
Note: When optimizing the heatsink pocket depth, the variation of the load cell height should also be
taken into account to make sure that all load cells protrude equally from the heatsink base. It may
be useful to screen the load cells prior to installation to minimize variation.
Remarks: Alternate Heatsink Sample Preparation
As just mentioned, making sure that the load cells have minimum protrusion out of the heatsink
base is paramount to meaningful results. An alternate method to make sure that the test setup will
measure loads representative of the non-modified design is:
• Machine the pocket in the heat sink base to a depth such that the tips of the load cells are just
flush with the heat sink base.
• Then machine back the heatsink base by around 0.25 mm [0.01”], so that the load cell tips
protrude beyond the base.
Proceeding this way, the original stack height of the heatsink assembly should be preserved. This
should not affect the stiffness of the heatsink significantly.
Figure 24. Load Cell Installation in Machined Heatsink Base Pocket (Bottom View)
Package IHS
Outline (Top
Surface)
Load Cells
Heatsink Base Pocket
Diameter ~ 29 mm
[~1.15”]
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