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Disclosed is a method that uses a rubber spacer as spring loading mechanism to measure package surface temperature. Benefits include a more consistent surface temperature measurement.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
56% of the total text.
Thermocouple Using a Rubber Spacer as a
Spring Loading Mechanism to Measure Package Surface Temperature
Disclosed is a method that uses a rubber spacer as spring
loading mechanism to measure package surface temperature. Benefits include a
more consistent surface temperature measurement.
In current thermal resistance metrology (TRES) at ATD, a
thermocouple is attached underneath a cooling solution with thermal insulated
epoxy (i.e. Omega Bond). To make sure the thermocouple contacts the package
surface, the thermocouple bead protrudes 1 to 3 mils out from underneath the
cooling solution. During the surface measurement, the thermocouple bead cannot
contact the surface consistently due to the presence of thermal interface
material between the cooling solution and the package surface (see Figure 1).
Also, the protrusion of the thermocouple bead can vary from operator to
operator during the thermocouple attach process. These inconsistencies produce variations
in the measured surface temperature and increase metrology errors.
Figure 2 shows the disclosed method using a rubber spacer as
the spring loading while measuring the package surface temperature. The
thermocouple bead is positively protruded by the rubber spacer with a certain
loading force, which then allows it to pass through the thermal interface
material and contact with the package surface. A meter converts voltage signals
that pass through a paired wire from the thermocouple bead to a tem...