Looking again at the ebay listing, those guys are much thicker than the TO-220 insulators I am used to.
Listing says they are 1 mm thick, so 40 times thicker than I was calculating for.
So the temperature rise across that insulator is 40 times what I calculated, or 0.085*40 = 3.4 degrees C
for 10 Watts of heat out of a TO-220 tab.
Makes sense, they are ceramic, anything too thin would fracture easily.
There are much thinner insulators, but they are made of material (such as mica) with much lower heat conductivity.
Given that these are ceramic and will not conform to metal surfaces when compressed,?
an appropriate heat sink grease is especially important.
Jerry
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On Thu, Jan 2, 2020 at 05:25 PM, Jerry Gaffke wrote:
That is less of a temperature difference than I expected, perhaps someone will see an error in my math?
