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LM3886 T vs TF (simple question, not an argument)
LM3886 T vs TF (simple question, not an argument)
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Old 21st January 2007, 12:10 PM   #11
head_spaz is offline head_spaz  United States
diyAudio Member
 
Join Date: Mar 2004
Location: Arkansas
When using the T form factors, I've found that thin kapton
insulators do a fine job.
Thermal resistance can be as low as 0.1. Better than mica.
Better than silpad, better than aluminum oxide. And, it's
reuseable. Hard to beat! Especially when you can buy it cheap.

Better yet, mount the T directly to a large heat speader...
and then insulate and mount the spreader to your heat sink
using Kapton. The larger area of contact will lower the thermal
resistance and transfer more heat.
Also the spreader will add additional mass, whereby it adds
another level of safety by protecting the junction temps during
high level transients / dynamics.


Polymide Kapton MT 2 mil thick Film insulator
(Dupont 200MT). - Dirt cheap on e-bay


Item number: 180028543577
5.5"W x 72"L (that's six feet long !)
Buy it now price is : US $8.99
US Postal Service First Class Mail is : US $2.25
Shows Qty = 12 in stock.

For you bulk buyers, the same vendor has:
Item number: 180028544664
5.5"W x 144"L (that's 12 feet long)
Buy it now price is : US $16.49
US Postal Service First Class Mail is : US $3.00
Shows Qty = 6 in stock.

Click the image to open in full size.

P.S. I'm not affiliated with this vendor, just thought I'd pass
the info to you'se guys.
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Old 21st January 2007, 12:44 PM   #12
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
1thou=1mil=0.001inch=0.025mm thick Kapton would be even better.
Does anyone know where to get that cheap?

3M selotape is a form of Kapton but not formulated for high temperatures. How well would that work? I think the adhesive is actually thicker than the tape!
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Old 21st January 2007, 01:38 PM   #13
BrianDonegan is offline BrianDonegan  United States
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Join Date: Dec 2004
Location: TPA HQ (The Basement)
LM3886 T vs TF (simple question, not an argument)
My general preference is Bergquist K-10 (Kapton-based) thermal pad. (http://catalog.digikey.com/scripts/p...name=BER118-ND). Have used it in many applications and never had a problem.

It is thicker, but especially for kits, where skill-levels vary widely, they are pretty foolproof. More experienced builders can do what they want.
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