Heatsinks

Mark245 · 14th May 2009, 05:33 PM

I have a question about mounting output transistors on a heatsink. First of all, is aluminum a good choice or is there a better material? Also, for TIP31/32 transistors, the collector is the metal part that will be mounted to the heat sink. Could this create a problem? The collectors for the TIP 31's should be at a different voltage than that of the TIP32's.
Thanks

h_a · 14th May 2009, 05:49 PM

Quote:

s aluminum a good choice

Yes! And the only affordable one ;-)

Quote:

is there a better material?

Copper, Silver!

Quote:

Also, for TIP31/32 transistors, the collector is the metal part that will be mounted to the heat sink. Could this create a problem? The collectors for the TIP 31's should be at a different voltage than that of the TIP32's.

Boom! in case anodizing is not perfect.

For this reason good people invented insulating heatpads.

Have fun, Hannes

Mark245 · 14th May 2009, 05:56 PM

Oh ok thanks. That actually makes me wonder, why is that metal part used for mounting attached to the collector? There is already a pin for it.

Hurtig · 14th May 2009, 06:23 PM

Because the power (heat) is dissipated in the collector of the transistor. In order transport the heat away from the silicon, the collector is connected directly to the collector.

Mark245 · 14th May 2009, 06:35 PM

Ok that makes sense now thanks for the help.

jitter · 15th May 2009, 10:42 AM

Don't forget the insulation ring between screw and case.

Minion · 18th May 2009, 01:11 AM

and use a Multimeter to make sure the Transistors are actully isolated from the heatsink .....

14th May 2009, 05:33 PM	#1
Mark245 diyAudio Member Join Date: May 2006	Heatsinks I have a question about mounting output transistors on a heatsink. First of all, is aluminum a good choice or is there a better material? Also, for TIP31/32 transistors, the collector is the metal part that will be mounted to the heat sink. Could this create a problem? The collectors for the TIP 31's should be at a different voltage than that of the TIP32's. Thanks

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14th May 2009, 05:56 PM	#3
Mark245 diyAudio Member Join Date: May 2006	Oh ok thanks. That actually makes me wonder, why is that metal part used for mounting attached to the collector? There is already a pin for it.

14th May 2009, 06:23 PM	#4
Hurtig diyAudio Member Join Date: Feb 2005 Location: Denmark - Århus	Because the power (heat) is dissipated in the collector of the transistor. In order transport the heat away from the silicon, the collector is connected directly to the collector.

14th May 2009, 06:35 PM	#5
Mark245 diyAudio Member Join Date: May 2006	Ok that makes sense now thanks for the help.

15th May 2009, 10:42 AM	#6
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	Don't forget the insulation ring between screw and case.

18th May 2009, 01:11 AM	#7
Minion diyAudio Member Join Date: May 2006	and use a Multimeter to make sure the Transistors are actully isolated from the heatsink .....

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