Heatsink with 'thread gutter' - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 31st July 2012, 02:26 PM   #1
diyAudio Member
Join Date: Mar 2003
Location: Zürich
Default Heatsink with 'thread gutter'

I was looking at some heatsinks and came across extruded heatsinks with a M3 'thread gutter' for mounting. At first I thought it was for mounting it to a chassis, but I also found some pictures of components bolt to the chassis using this 'thread gutter'.

Radiatory serii SK125, SK125-50SA, SK125-84SA

That picture can only be for illustration purposes, as all tabs are probably shortcircuited. So, can it really be used this way? And would want limit the dissipation on the TOxxx body (because part of the body is not in contact with the heatsink)?

many thanks for your replies! Erik
my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!
  Reply With Quote
Old 31st July 2012, 03:07 PM   #2
diyAudio Member
Join Date: Mar 2003
Location: Zürich
Looking at the heatsink again I think the thread gutter is indeed meant to be used that way, as the TO220 'feet' just go nicely through a possible PCB attached to the bottom of the heatsink (and held in place with other M3 screws to the other thread gutter on the heatsink).

And what about insulating pads? Do you think there will be additional stress on them due to the 'gutter'? Shall it be possible to use silpads without them tearing?
my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!
  Reply With Quote
Old 31st July 2012, 04:28 PM   #3
macboy is offline macboy  Canada
diyAudio Member
Join Date: Oct 2003
Location: Ottawa, Canada
This will not limit dissipation by any appreciable amount. The heat is concentrated under the body of the part, not at the end of the tab.

Sometimes it is OK to short out the tabs. In the case of four diodes (presumably configured into a bridge recitifer) as pictured, it is not OK. But the picture is for illustration only, and any insulating washers would obscure the view of the heatsink.
  Reply With Quote
Old 31st July 2012, 04:52 PM   #4
diyAudio Member
Join Date: Mar 2003
Location: Zürich
Good! I also thought that the heat will not concentrate on the tab, as it is there only for mounting purposes. Also heat will spread well over a metalic surface, so the tab won't be 'very hot' even if it is not completely in contact with heatsink material.

yes, you are right, sometimes shorted tabs are indeed needed. It is just that these four diodes (I think) on the example don't make sense.

All with all, many thanks!
my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!
  Reply With Quote
Old 5th August 2012, 03:46 PM   #5
diyAudio Member
Join Date: Sep 2010
See this semi-relevant AN from IRF that popped up here a few months ago:


For the 'super-220' package they propose a clip that presses on the body of the device, in lieu of the regular bolted-tab mounting.

ON has something similar to say in their AN:


Last edited by discrete; 5th August 2012 at 03:49 PM.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Where's the Heatsink Supplier thread? speakerguy79 Parts 0 10th October 2007 11:15 PM
Sorry, another heatsink thread EsE Pass Labs 19 4th June 2007 10:45 PM
Found JBL L40's in the Gutter! drpepper Multi-Way 4 18th May 2005 08:09 PM
Heatsink Sourcing (split from AXB thread) Aud_Mot Pass Labs 38 21st August 2004 03:15 PM
Aleph 2 heatsink thread Gabster Pass Labs 21 29th January 2003 08:44 PM

New To Site? Need Help?

All times are GMT. The time now is 05:11 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2