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May 1998

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Subject:
From:
Glenn Pelkey <[log in to unmask]>
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Date:
Tue, 12 May 1998 08:28:21 PDT
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Just thinking about your situation and some of the responses, I was wondering
how some of these limits have been established?

In relation to environmental testing, has anyone determined the acceleration
due to temperature?  And, what is considered a failure?  I was thinking this
should include below and above the glass transition temperature, even if it's
not a typical use environment.

Then one more twist, what about the influence of humidity?

Thanks is advance for any response.

Glenn Pelkey
Maxtek Components Corp.

|         ----------
|         From:   Sam Mollet[SMTP:[log in to unmask]]
|         Sent:   Monday, 11 May, 1998 14:25
|         To:     [log in to unmask]
|         Subject:        [TN] Maximum FR4 operating temperature
|
|
|         I have an application with a maximum ambient temperature of 70
| °C.  I am using copper planes on FR4 to help cool some power resistor
| leads.  The copper planes can hit 115 °C.  Is this a problem?  Is there
| a rule of thumb on how hot FR4 can continuously be operated at?

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