In a message dated 09/08/99 9:51:32, [log in to unmask] writes:
>Does anyone know what the minimum acceptable solder joint shear strengths
>are for Sn63/Pb37 and In50/Pb50 ?
>We are trying to optimize our soldering to gold interconnect process and
>need some baseline/ industry standard numbers.
Hi Ron,
There is no shear strength standard for solder joints, nor can there be.
If solder joints are properly wetted, they have more than ample strength for
normal, even severe,  handling and operating conditions. If they are not
properly wetted, the strength will be inadequate; because you really do not
have a solder joint. Solder joint reliability for properly wetted SJs is not
a function of SJ strength.
The solder joint strength in pull/shear will vary with lead geometry, solder
volume, lead metal/metallization, the way the test is done. For 50-mil-pitch
gullwings pull strength between 2000 and 5000g are typically measured.
What do you mean by "gold interconnect process"?

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

##############################################################
TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################