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MC2 is pleased to announce the release
of No-Stress heat spreaders: heat spreading substrates with tailorable
thermal expansion properties. No-Stress heat spreaders offer a unique
combination of:
- High Thermal Conductivity
- Low Thermal Expansion
- Affordability
- Easy Machining & Attachment
Unlike aluminum and copper substrates, No-Stress spreaders make it
easy to use high conductivity hard bonds between low expansion semiconductor
or ceramic materials and the heat spreading substrate - without creating
excessive residual stresses in the semiconductor material. Compared
to the other leading high conductivity/low thermal expansion materials
shown in the table, the No-Stress heat spreaders are tailorable over
a broader range, while simultaneously offering greater ease of use and
lower costs.
| Heat Spreader Substrate |
CTE
(x 10^-6/K) |
k
(W/m/K) |
| Kovar |
5.3 |
17 |
| W/Cu |
6.7 - 8.0 |
185 - 210 |
| Mo/Cu |
7 - 8 |
160 - 170 |
| AlSiC |
6.4 - 7.3 |
160 - 180 |
| No-STRESS |
5 - 12 |
100 - 250 |
Performance
The thermal performance of the No-Stress heat spreaders is shown in
the graph below. The No-Stress material spreads heat in two dimensions:
a laser diode would typically be mounted on the edge of the spreader,
and the waste heat would be dissipated away from the edge. The heat
is spread in the plane normal to the long axis of the diode. In this
configuration, the spreader provides approximately ½ the thermal
conductivity of copper, with a thermal expansion of 9 x 10-6/K.
Options
 The
No-Stress heat spreaders can be fabricated in a variety of design configuration
and sizes to extremely high tolerances. The matched expansion material
can be integrated into conventional copper heat spreaders to optimize
thermal performance. They are available with copper or gold plating
and with user-specified surface finish. The No-Stress attributes can
also be integrated into MC2's air-cooled and liquid-cooled
heatsinks for enhanced thermal performance.
Availability
Now available in evaluation quantities. Larger quantities and custom
designs can be built to order.
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