Werner, what's that plug for Fantasy Football doing in your signature
line? I thought you were a soccer guy! :-)
Mike Buetow
Editor in Chief
Circuits Assembly
w/m 617-327-4702
Virtual-PCB -- the industry's first virtual trade show:
www.virtual-pcb.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Tuesday, July 22, 2008 9:13 AM
To: [log in to unmask]
Subject: Re: [TN] They solder well... But they don't work!
Hi Dale,
In all your descriptions, you are not telling us what the failure mode
actually is. On the basis of what do 75% not pass? Are the failures just
some undefined functional dysfuction?-your wire-bond inclusion in the
discussion leads me to believe this.
You also are not telling us what the reflow profiles [both standard and
increased] at the QFP leads [not the PCB soldering pads] are. This is
needed to make sure that the heat sink, which the die is and to which
the leads are attached, does not keep the lead temperature too low even
with your increased profile.
Werner Engelmaier
Future workshops:
Solder Joint Reliability: Parts 1 through 4, July 21/22, Hamburg,
Germany Pb-Free Soldering Processes-Survival, Quality, Reliability,
August 18, Orlando Reliability Issues with Lead-Free Soldering
Processes, September 22, Schaumburg Failure Mode and Root Cause Analyses
Reliability (Fatigue, Brittle Fracture, ENIG), September 22, Schaumburg
Solder Joint Reliability: Parts 1 & 4, Oct. 9, Moscow, Russia Solder
Joint Reliability: Parts 1 & 4, Oct. 17, Timisoara, Rumania Solder Joint
Reliability: Parts 1 & 4, Oct. 22, Tallinn, Estonia
**************
Get fantasy football with free live scoring. Sign up for FanHouse
Fantasy Football today.
(http://www.fanhouse.com/fantasyaffair?ncid=aolspr00050000000020)
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives Please
visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
