TECHNET Archives

March 1998

TechNet@IPC.ORG
Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
Re: Secondary reflow during wave
From:
ETS <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 20 Mar 1998 11:29:58 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (49 lines) 
One thing that should reassure you is that once solder has been reflowed it
takes a higher temperature to reflow again. Check with your solder paste
supplier for actual second reflow temps.

Brian Stumm
ETS, LLC
509-483-0900 (voice)
[log in to unmask] (e-mail)


>I have a board with a 208 pin QFP top side.  During the wave process the
>QFP lead at its solder joint reaches 178 degrees C.  Eutectic solder
>reflows at 183 degrees C so the joints should not be reaching molten state
>and visual observation at least confirms that.  What is an acceptable high
>end temperature for these joints to see before the joint is degraded to the
>point of being a reliability risk?  Are there any empiracle tests that  can
>be used to determine the degradation of the joint if any is taking place?
>
>Jim Gryga
>
>################################################################
>TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
>################################################################
>To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in the body:
>To subscribe:   SUBSCRIBE TechNet <your full name>
>To unsubscribe:   SIGNOFF TechNet
>################################################################
>Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional
information.
>For the technical support contact Dmitriy Sklyar at [log in to unmask] or
847-509-9700 ext.311
>################################################################
>
>
>

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################

ATOM RSS1 RSS2