Terry, 

There are several products that has high thermal conductivity that would fit
your requirements 
 
We have used Thermagon-T-Lam/preg (Laird purchased Thermagon) and
Berqquist-Thermal clad for thermal management in multi-layer and FR4-hybrid
PCB constructions 
 
http://www.lairdtech.com/pages/catalogs/thermal.asp

http://www.bergquistcompany.com/thermal_substrates.cfm

Hope this helps, 

Regards,


Roger Tingler
Methods Engineer
Colonial Circuits
V:800-578-9602 x102
  540-752-5511x102
F:800-631-0856
  540-752-4832

E-mail: [log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Terry Kozlyk
Sent: Thursday, May 31, 2007 7:02 AM
To: [log in to unmask]
Subject: [TN] Conductive Cooling thru Pre-Prig material

Technetters;

 

I have a 6 layer PCB with about 8 HOT DPAK components. The tabs are
electrically hot so I cannot just draw the heat directly thru a copper fill
brought out to the edge of the PCB.

 

I need electrical isolation, BUT high thermal conductivity between 2
adjacent layers.

 

Can anyone recommend what material they have specified to be used for
pre-prig that conducted the heat to the adjacent layer?

 

Voltage max is about 50 volts so I could probably go down to 2 or 3 mil
pre-prig.

 

Nothing special about this PCB; about 5" x 5".

 

The fab houses I solicited for info still haven't replied so I am curious.

 

Any leads, products or websites would be appreciated.

 

Regards

TDK


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