Electronics Forum | Sat Mar 06 17:45:29 EST 2010 | isd_jwendell
Unfortunately, what you are calling a good fillet is not a good fillet. Solder on the top of the IC lead does not help to make a good connection. The most important fillet is the one located at the heel (think of the IC lead where it meets the PCB as
Electronics Forum | Thu Jun 10 16:51:01 EDT 2010 | daxman
Hi Manuel, We've been placing QFN's with our CP6's for a long time now. We use vision type 10 just like you describe. I wouldn't bother with front lighting & trying to pick up the leads. Inspecting the leads doesn't provide better accuracy. I would
Electronics Forum | Mon Aug 23 14:09:56 EDT 2010 | davef
Similar to Coop's comments, above ... Bridging: * Mis-placement: misplaced components, high placement force mushrooms paste * Too much paste: HASL thickness, lead finish, poor underside support, poor underside wipe frequency, printing with too lar
Electronics Forum | Thu Oct 07 07:58:29 EDT 2010 | scottp
The problem is there are also studies showing reduced reliability. Early thoughts were that if you got complete reflow of both solder materials then you'd be fine, but several studies have shown that there's something going on that's not well unders
Electronics Forum | Sat Feb 05 12:41:41 EST 2011 | ppcbs
Any distributors or do you know any distributors > that can deliver a T5 Lead solder paste by 01/25 > or close? Thank you to everyone who provided leads. I ended up getting a T5, 63/37 paste. I can't beleive how nice it prints. I'm printing 5 m
Electronics Forum | Fri Mar 18 13:42:02 EDT 2011 | kahrpr
First thing try a different solder paste. All solder pastes are not created equal. Also if everything else on the board looks good then check the part. As far as nitrogen goes its about 4 bucket loads you need an external tank. I have seen some marg
Electronics Forum | Wed Apr 06 04:19:52 EDT 2011 | grahamcooper22
Almit are specialists in formulating fluxes for pastes and wires for the very very demanding Japanese assembly market. And the key to good SMT is how the flux performs...and our formulation improvements are driven by requests from the companies who a
Electronics Forum | Thu Sep 29 17:42:49 EDT 2011 | action_101
I used Indium WF-9940 at the last place I was at for 5 years. We ran leaded and lead free product in our ERSAflow selective soldering machine with that flux type. It worked good for both applications. The place I am at now we have an Ersaflow selecti
Electronics Forum | Mon Oct 03 15:13:00 EDT 2011 | tombstonesmt
It sounds to me that it's a heat transfer issue. The solder is only bonding to the lead on not the barrel correct? Does your selective solder equipment have any type of heating source? Can you "dwell" on that particular joint? On some of our products
Electronics Forum | Thu Jan 12 20:11:25 EST 2012 | davef
Isola water pressure. Between a 210°C normal tin lead cycle and a 250°C lead-free assembly cycle, the vapor pressure doubles. Reflow temperature [*C]||Vapor pressure of water [psi] 150||100 200||225 210||260 220||320 230||400 240||480 250||580 300||1
