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March 2007

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From:
Joyce Koo <[log in to unmask]>
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Date:
Fri, 23 Mar 2007 10:23:20 -0500
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IPC-TM-650 check for outgas (test method)

abcd

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Upton, Shawn
Sent: Friday, March 23, 2007 9:11 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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