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The laminate will have an maximum operating temperature which is
different from Tg and Td. Years back UL just tested materials to a 105C
maximum but newer materials have been tested at the 130C, which is the
case for most FR4's at "most" manufacturers.
Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice - 802.257.4571 ext 37
Fax - 802.257.0011
<http://www.vtcircuits.com/>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Upton, Shawn
Sent: Friday, March 23, 2007 10:11 AM
To: [log in to unmask]
Subject: [TN] PCB Temp Guidelines
Had a recent question about using a PCB at 105C; I wasn't sure about it.
I usually spec FR4 for HASL finish, FR4 with Td_min=350C/CTE_max=3.5%
for immersion gold finish; and haven't done high temp (150C or more)
yet. I figured, the board in question was RoHS compliant, so it
shouldn't outgas too quickly at 105C, at least not for brief testing --
but I wasn't sure about prolonged periods.
So, the question is, what is regular FR-4 recommended up to for
temperature?
Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336
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