Electronics Forum | Wed May 24 16:19:58 EDT 2006 | inds
John, there have been quite a few discussion on Mixed Assemblies in this forum.. do a search.. you will get whole lot of information.. in addition - IF you are using Lead-free reflow profile...make sure the rated temp for Sn-Pb components is not vi
Electronics Forum | Wed Feb 24 11:28:09 EST 2010 | vleasher
I apologize for being so vague. It is a standard leaded process using ALPHA OM-5100 for the SMT. So would a reduction in wash temp result in less white residue?
Electronics Forum | Thu Jan 24 13:23:53 EST 2002 | Shawn
Thank you all very much for the responses. The solder is eutectic and the problem, as far as I can tell, has been around before I was here, 2+ years. The flow machine is a treiber with 2 bottom preheaters and 1 top. The solder pot temp is 500F +/-4F
Electronics Forum | Wed Aug 23 19:01:54 EDT 2000 | kbmacg
For high temperature electronics, operating in 225�C ambient environments, most solders can not be used. The high-lead solders all have difficulties of one sort or another. Is their anything new regarding useful high melting point solders? Especially
Electronics Forum | Mon Dec 02 17:02:28 EST 2002 | Vince Whipple
Steve, I agree with the recommendation to check the temperature. This is the first place to go. Is this an IPA or water based Noclean? What is the topside temp of the assembly at the effected areas? If you are too cold you will have a tendency to hav
Electronics Forum | Mon Jul 18 13:34:31 EDT 2005 | jzaccari
Francisco, You need to be concerned about "lead-free" BGAs. The SAC balls will not reflow at at standard tin-lead process temps. I have seen many examples where this has been a very big problem. In once case the BGAs just poped-off when the board was
Electronics Forum | Wed May 24 16:47:21 EDT 2006 | patrickbruneel
Inds, It's about time that lead-free components can stand higher temps "myth" stops. The only difference is the plating, the component itself has not changed. Can you give us an update on this threat? If you�re the same inds http://www.smtnet.com//
Electronics Forum | Fri Mar 06 02:47:15 EST 2009 | lococost
Have you tried higher peaktemp? I saw the QFP is sn90pb10, This has a liquidus of 268 - 302 C. A good paste should be able to handle 230C (or more), of course you would need to check your other components peak temp.
Electronics Forum | Thu Feb 25 15:24:58 EST 2010 | jdumont
We use the OM-5100 and wash it with relatively good results. Just dont let it sit longer than a few days before wash. We've used Zestron AC200 and A-250 in a batch cleaner set to 140 wash temp for 8-10 min @ the recommended concentrations. We have h
Electronics Forum | Wed Feb 06 07:18:47 EST 2019 | SMTA-Bob
I am looking for some old scrape boards that have either CCGA or CBGA, high temp columns or balled devices for some process experiments I am doing. If anyone has some please let me know, the company name or supplier will not be see or used Many than
