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June 2007

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Mon, 25 Jun 2007 11:02:41 -0500
Content-Type:
text/plain
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text/plain (168 lines)
Get Werner Engelmaier's white paper, which includes the appropriate and
comprehensive fabrication notes to put on the drawings to ensure you get
a board you can use. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis
Sent: Monday, June 25, 2007 9:36 AM
To: [log in to unmask]
Subject: Re: [TN] UL specification on temp rating for bare board
material

David,
    Thanks for the response and the image of your fabrication notes. All
of our designs are Pb so I do not have to worry about the elevated temps
of a Pb free process.
    My problem is that the boards I normally deal with are large in size
with a great deal of copper pours all over the board. I know from a
process and field stand point the boards would be more reliable using a
higher Tg.
The response I get is that we have large vias to help offset problems
with barrel wall strength.

Regards,

Ted


Regards,

Ted
----- Original Message -----
From: "David Greig" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 25, 2007 9:10 AM
Subject: Re: [TN] UL specification on temp rating for bare board
material


> 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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