Electronics Forum | Fri Jul 20 08:09:09 EDT 2007 | chrispy1963
In passives I dont know if anything changed at all other than the terminal plating. As for Active components there has been much engineering done to allow for the extra heat needed to liquify say SAC305 or other lead free pastes without damage to th
Electronics Forum | Fri Apr 21 07:44:04 EDT 2006 | amol_kane
yes! i though this thread looked familiar! looks like it has been repeated....even the response from muse is very very familiar...that, or i am have a serious attack of deja vu! thanks for the requote though.......by doing some research I decided to
Electronics Forum | Sun Sep 17 02:48:41 EDT 2006 | Eric
Anyone know any international standard (e.g. IPC, JIS) for the SAC lead free solder strength ? If no, any industrial / company standard for it ? Besides, any mathematical model which can help to calculate it.... express in "Force / area "
Electronics Forum | Tue Sep 16 16:45:44 EDT 2008 | trynders
Thanks for the response! I thought is was odd the component vendor chose SAC for a lead frame finish. I am in the Military world, and things have been difficult to control from a lead-free standpoint. I have not been able to find any studies on SAC
Electronics Forum | Tue Sep 16 09:25:49 EDT 2008 | trynders
I had a vendor change thier lead finish from tin/lead to a SAC305. We built up several assemblies before we realized the change. The reflow process is a standard leaded profile peaking at 220 C. What are the reliablity concerns with mixing the tin/l
Electronics Forum | Wed Sep 17 09:33:08 EDT 2008 | vladig
There is one thing you should keep in mind, though. It's better not to have any area of the leads covered with only SAC after re-flow, just to make sure you Sn-whiskers won't have any chance to grow :-) Vlad
Electronics Forum | Wed Nov 09 12:19:55 EST 2005 | bhu
We have used the Indium sac305 lead free with good results.
Electronics Forum | Sun Sep 17 09:02:53 EDT 2006 | davef
Just as you will not find such a specification for SnPb solder, you will not find such a standard for SAC. We talked about solder strength several times previously here on SMTnet. Search the fine Archives for others comments. For instance: http://
Electronics Forum | Thu May 01 15:42:53 EDT 2008 | ck_the_flip
Yes, the authors do give the caveat that small amount of lead contamination in a SAC/Lead-Free system is tolerated provided the Pb-BGA has sufficiently reflowed. This verbiage is on the bottom of Figure 10. For my own peace-of-mind, I would send yo
Electronics Forum | Fri Mar 16 08:01:53 EDT 2007 | ck_the_flip
SAC coated leads on certain components require more dwell time. If you find that you have top-side wetting issues, slow the conveyor down a bit or increase your wave height, or, a combination of the 2.
