Ted,

Here is a snap of part of the notes I use. If your assembling lead free then most < 170C materials are unlikely to be suitable.


Best Regards
 
David Greig
______________________________
GigaDyne Ltd
5 Albany Business Centre
Gardeners Street
Dunfermline KY12 0RN
United Kingdom
t: +44 (0)1383 624 975
www.gigadyne.co.uk
______________________________

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis
Sent: 25 June 2007 14:50
To: [log in to unmask]
Subject: [TN] UL specification on temp rating for bare board material

I have just sent out two designs to be quoted both are high power designs for industrial applications. now I am new here and
thought it would be a good idea to add more detail to the fabrication notes. The material I called out for was 4101/23 or 24
with a minimum Tg of 170, the old notes didn't call out for anything. So I get the quotes back and my employer said to go back
to the 140 Tg, the new material isn't needed. I tried to explain to him that a 140 Tg used in the environment you expect to have
this product operate in is risky. He explained to me that UL specifies an operating temperature of the material and that we will
never reach that level. I tried to explain to him that's when the material fails in a ball a flames. UL is not concerned if the
product will function correctly or not, their concern is will someone get hurt or die. Is my understanding correct on the UL
requirements? UL is just a flame and voltage limit not a limit on normal operating temperature ranges?
    He pays the bills so he can do what he wants however, I am getting tired of trying to explain to him not to confuse we have
never had a problem so far with you have just been lucky thus far.

Thank you,

Ted Tontis CID
Manufacturing Engineer
Custom Power Technology
N93 W14605 Whittaker Way
Menomonee Falls, WI 53051
[log in to unmask]
www.custompowertech.com
Phone: 262-253-0880
Fax: 262-253-0948

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