I'm not sure if they have separate ratings just for laminates, but when
conformal coatings are tested - 'Coatings for Use on Recognized Printed
Wiring Boards (QMJU2)', the highest temperature rating when using FR-4 is
130C. This involves environmental cycling for 1000 hrs at 160C or 300 hrs
at 175C.
Lamar
John DeBrita <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
12/15/2009 08:18 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
John DeBrita <[log in to unmask]>
To
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cc
Subject
Re: [TN] [BULK] [TN] PWB Operating Temperatures
Underwriter's Lab's has this info for various laminate types. It is their
"MOT" values or Max operating temperature rating.
Regards,
John F. DeBrita
Director of Process Engineering
DDi
BUILDING TOMORROW'S TECHNOLOGY ... TODAY
Tel: 714 688-7296 Mobile: 714 944-2214
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Friday, December 11, 2009 12:12 PM
To: [log in to unmask]
Subject: [BULK] [TN] PWB Operating Temperatures
Importance: Low
Hi All,
Can anyone tell me, or direct me to where I can find, the maximum
sustained operating temperature for a PWB fabricated with FR4.
What are some of the reliability concerns, at the assembled board level,
associated with a constant temperature of 70°C?
Thanks
Paul Reid
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