Electronics Forum | Fri Jul 15 13:58:32 EDT 2005 | seaK
Our production is putting QFN40 and QFN56 package on board. With 80% opening on terminal, 40% on thermal pad, we found QFN56 100% forming toe fillet, but it does not work out the same to QFN40. We suspect it's because of the weight of component.....
Electronics Forum | Fri Apr 13 15:42:18 EDT 2007 | flipit
This is sort of interesting. We had a clock problem with Alpha OM-338 lead free paste. The flux residue was causing a clock problem and the clock was only a few KHz. We went back ot OM-5100 lead paste and the problem never occurred again. Chris
Electronics Forum | Wed Oct 31 04:37:15 EDT 2007 | aj
Hi, My oven has 5 zones each 12 inches in length , giving a total of 70 inches Heating Zone in total. I am working with a 6 layer PCB ,ENIG Finish. I am using Alpha OM338T no-clean Solder Paste. I am working to a cycle time of 4 to 4.5mins RTS p
Electronics Forum | Thu Jan 10 09:23:20 EST 2008 | jdumont
Looking for some opinions on what the best, readily available, Alpha lead free water sol paste is out there. Only thing I can see on their website is the WS-819. Anyone with experience with this? We currently are using the OM-338 NC which works great
Electronics Forum | Mon Feb 11 17:21:40 EST 2008 | larryd
What causes BGA voids over 25%? Have recommended profile for solder paste, hit 237C for 5 seconds and still get a void on 2% of specific BGA in various locations. BGA is FG676, 1mm pitch, on ImAg using lead free paste OM338 on a 6 layer FR4 PCB.
Electronics Forum | Tue Feb 12 04:07:29 EST 2008 | aj
Hi, Have you checked out the BGA datasheet and see what profile is recommended for the BGA ? I use OM338 and there are dozens of recommended profiles for the Paste but you have to consider the components aswell. You state your Peak temp which I w
Electronics Forum | Wed Feb 23 01:06:06 EST 2011 | kemasta
Hi all Recentlt I encounter a issue, the solder paste was not dry after wave. Mostly happen and the end of the board. It is rare case, 1 day happen about twice. But to achieve our quality target, I still need to overcome this issue. I use Alpha OM-
Electronics Forum | Mon Jun 07 17:43:42 EDT 2004 | russ
Doing a little poll here. How many of you are using lead free paste and what type/brand are you using. We are using Alpha OM338 SAC405. I am not liking it very much so far. It seems to be too viscous. It is definitely the thinnest stuff I have e
Electronics Forum | Thu Apr 06 16:42:44 EDT 2006 | russ
this is all good jay but would WML have to say about this paste? I'm gonna wait for his response before I do anything! I am bringing in some samples of this soon to try for myself. I have a part that the manufacturer says to run with a paste with n
Electronics Forum | Tue Nov 17 22:36:17 EST 2009 | rajeshwara
Hi All Plz help , we are manufacturer of Set Top Boxes , where we use ST BGA 5202 ,Paste : ALPHA METAL OM338-T45-LF & STENCIL : 4 MIL & we also tried 5 mil . Problem : At first Test BGA work fine but after some days Assembly dead functional and when
