heat transfer of MOSFET to heatsink - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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
Reply
 
Thread Tools Search this Thread
Old 4th August 2013, 01:38 PM   #1
jdg123 is offline jdg123  United States
diyAudio Member
 
jdg123's Avatar
 
Join Date: Jan 2010
Location: Traverse City, Michigan
Default heat transfer of MOSFET to heatsink

Please help me beat the heat for my first Pass Labs DIY...

In the BOM for Aleph J there is no mention of a paste or pad for attaching items to heatsinks. I just need a recommendation please.

Thanks!
  Reply With Quote
Old 4th August 2013, 01:50 PM   #2
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
search for "mica and goop" thread

no need for beating a dead horse

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 4th August 2013, 02:09 PM   #3
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Mica or silicon insulator and "goop" which is thermal transfer compound - otherwise known as white s**t. If you opt for the grey soft insulator you wont need any goop.
  Reply With Quote
Old 4th August 2013, 03:15 PM   #4
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
The DIYaudio store sells red Keratherm in the proper size - these are the amongst best available goop-less insulators you can get.

10 Keratherm® Red Insulators - Parts

If you don't want to wait, you need a pad designed for TO-247 and/or TO-3P package fets, and are looking for a low thermal impedance.

The search engines at Mouser and Digi-key both have a fantastically hard time with this...
So here you are - http://www.mouser.com/ProductDetail/...aI9mlusI07Y%3d

This is the new Bergquist A2000 material, which looks to be incredible good.

  Reply With Quote
Old 4th August 2013, 03:49 PM   #5
jdg123 is offline jdg123  United States
diyAudio Member
 
jdg123's Avatar
 
Join Date: Jan 2010
Location: Traverse City, Michigan
Default great help!

Thank you for the excellent pointers!!!
  Reply With Quote
Old 4th August 2013, 03:54 PM   #6
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Please do read up on "goop". It's not there to help the thermal transfer, well not in massive quantities anyway. The aim is to get the "devices" to sit as flat as possible on the heatsink so that heat can flow. If the MOSFET was PERFECTLY flat and the heatsink was PERFECTLY flat there would be no requirement for goop. In reality the two mounting surfaces are anything but flat. The goop is only there to fill in the irregularities between the two surfaces.
  Reply With Quote
Old 4th August 2013, 09:40 PM   #7
diyAudio Member
 
Triodethom's Avatar
 
Join Date: Dec 2009
Location: Newnan GA
A sheet of glass and some 2000 grit paper to polish the surfaces are how cpu get mated to heat sinks and then they still use silver goop. Well at least the hard core ones do this for heat transfer.
  Reply With Quote
Old 4th August 2013, 09:45 PM   #8
diyAudio Member
 
Triodethom's Avatar
 
Join Date: Dec 2009
Location: Newnan GA
Quote:
Originally Posted by 6L6 View Post
The DIYaudio store sells red Keratherm in the proper size - these are the amongst best available goop-less insulators you can get.

10 Keratherm® Red Insulators - Parts

If you don't want to wait, you need a pad designed for TO-247 and/or TO-3P package fets, and are looking for a low thermal impedance.

The search engines at Mouser and Digi-key both have a fantastically hard time with this...
So here you are - http://www.mouser.com/ProductDetail/...aI9mlusI07Y%3d

This is the new Bergquist A2000 material, which looks to be incredible good.

How about the
SPA2000-0.015-00-58 it about 1/2 the price .
  Reply With Quote
Old 4th August 2013, 10:25 PM   #9
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
It's too small for a TO-247.

Why are you speaking so largely?


  Reply With Quote
Old 5th August 2013, 02:40 PM   #10
diyAudio Member
 
Triodethom's Avatar
 
Join Date: Dec 2009
Location: Newnan GA
Quote:
Originally Posted by 6L6 View Post
It's too small for a TO-247.

Why are you speaking so largely?


Sorry about that it the past and copy I used did not mean to be rude.
  Reply With Quote

Reply


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
Improving heat transfer of ICs uncle_leon Chip Amps 64 15th July 2011 10:36 AM
heatsink thermal transfer GeeVee Solid State 4 29th September 2009 01:10 PM
Coping with amp box heat (not heatsink sizing) cfcubed Pass Labs 5 23rd July 2008 04:59 PM
Heat transfer sompound and mica , silpads etc dhole Pass Labs 1 29th April 2005 04:45 PM
Is solder a good heat transfer medium? leadbelly Parts 3 11th March 2004 03:33 AM


New To Site? Need Help?

All times are GMT. The time now is 05:59 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2