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Old 19th December 2003, 10:50 AM   #1
Magura is offline Magura  Denmark
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Question Copper heat spreaders

Anyone got experience with copper heat spreaders?

How big and how thick for the respective heat transfer?

Magura
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Old 19th December 2003, 12:25 PM   #2
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both Wakefield and AavidThermalloy have "white papers" on their websites -- some of the articles are pretty academic. There is a very good explanatory paper on the On-Semi webiste -- they have all their application notes chronologically listed -- look for Ap Note 1570 on Thermal Management.
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Old 19th December 2003, 01:47 PM   #3
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Here are a couple of threads (one with photos) that talk about the subject. There are more that I haven't been able to find.
http://diyaudio.com/forums/showthrea...5&pagenumber=2
http://diyaudio.com/forums/showthrea...307&highlight=
In one thread that someone I havn't found yet, someone actually has measurements with and without the spreader.
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Old 24th December 2003, 12:46 PM   #4
sully is offline sully  United States
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The heat spreader is used to spread the heat to a wider area.

Copper has about twice the thermal conductivity of aluminum, so give less thermal drop closer to the transistor die.

By making the copper thicker, the actual thermal grease area that is used to transport heat is larger. This is where the most benefit occurs, by making the heat path wider where the electrical insulation is.

If anybody would like to know more about the 45 degree heat path thermal modelling, I'll be back on the 5th of Jan.

Happy holidays...Happy new year..

Cheers, John
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