Electronics Forum | Fri Sep 21 10:44:34 EDT 2001 | slthomas
You can, and for small parts you probably won't see much difference between body temp. and lead temp. For QFPs or PLCCs there will be a much greater delta, though. I'd be more concerned with the small surface area you're making contact on (spherica
Electronics Forum | Fri Oct 26 09:38:57 EDT 2007 | slthomas
Rather than go into detail here, try googling "classic reflow profiling". One of the guys at ECD (a thermal profiler manufacturer) wrote a pretty decent article that covers most if not all of it. You DO have a profiler, don't you, or an oven with
Electronics Forum | Thu Oct 25 11:29:04 EDT 2007 | ck_the_flip
Forget all the bickering and semantics. EVERYONE IS RIGHT!! ...but then again, in soldering, there IS no right, wrong, or indifferent... just blame. :-) Soldering is, after all, the most difficult process with the most opportunities for defects.
Electronics Forum | Wed May 19 07:38:42 EDT 2004 | Bob L.
I'm trying to help one of our remote sites solve a problem with a warped PBGA. The corners are lifted, creating columnar joints and the central balls are sometimes shorting. I've verified that it's not popcorning and I've got samples going to the l
Electronics Forum | Wed Mar 24 10:04:09 EST 2004 | Marc Apell
183C, 60 +- 15 seconds). The quesiton to use a straight ramp or soak profile comes down to the product your are soldering. The key is to get the whole assembly at the same peak temp (minimized delta) and same TAL for effective formation of the so
Electronics Forum | Tue Dec 28 12:55:16 EST 1999 | Justin Medernach
Greg, The best advice that I can give you is a PBGA will respond just like any other surface mount package. There may be a 5 degree delta between a PBGA 356 and a QFP208 but the two respond very similarly in the convection reflow environment. CBGAs
Electronics Forum | Tue Oct 16 11:32:48 EDT 2007 | cyber_wolf
FYI: This seems to be worse depending on the oven....I think it may have to do with the way the machine exhaust. I have used the Fuchs on our Omniflow and on our XPM's.(Pb Free profiles) The Omniflow stinks the whole shop up....the Vitronics do not s
Electronics Forum | Wed May 12 16:31:25 EDT 2004 | Mark @ SolderStar
In answer to your questions. (1) pls can any body throw some light on the reflow profiling? Reflow profiling is the process of confirming that you PCB's that pass through your reflow oven are produced within specifications provided by solder paste
Electronics Forum | Fri Sep 07 12:19:20 EDT 2007 | guqing
We are having problem to develop lead-free (SAC305) reflow profile for big SMT electrolytic caps. The delta T of the joint of the cap with the rest of the board is too big to fit in the tighter lead-free window. Any suggestions regarding the total pr
Electronics Forum | Sat Sep 19 09:52:09 EDT 2009 | profilingguru
Before you rule out the profile, did you run an actual profile of the board or run machine characterization? How old are your TCs? Have you run them more than a half dozen times? Is your profiler calibrated. In my experience making a living of pr
