Electronics Forum | Sat Apr 18 09:44:46 EDT 2009 | davef
Low tombstone pastes have been around for 8-10 years. Talk to your paste supplier about suggestions of the "latest and greatest." Usually these pastes: * Are a blend of alloys with slightly different melting points * Have a mid-level activity flux *
Electronics Forum | Sat Apr 18 17:42:07 EDT 2009 | billwestiet
I like this suggestion the best as a "band aid", check out some of the low tombstoning solder pastes. I've seen these work.
Electronics Forum | Tue Apr 21 16:33:06 EDT 2009 | llaerum
Home plate design is great for avoiding beads and tombstoning in some cases, but it will not help you when the spacing is too far apart. It will make it worse. You need a good even screen and accurate placement.
Electronics Forum | Wed Apr 15 17:16:00 EDT 2009 | rmitchell
Hi, I am trying to reduce some 0402 cap tombstones. The main cause is the pad spacing is a little too far apart and the parts are as tall as they are wide .5mm I am stuck with the pad spacing for a while. All other parts are soldering well, even 0
Electronics Forum | Thu Apr 11 16:37:16 EDT 2002 | pteerink
Profile would be the first place I look. Check your rise and fall rates for temp. Should be no more than 2 deg/sec for rise and 4-6 deg/sec for cooling. Phil
Electronics Forum | Thu Apr 16 08:01:38 EDT 2009 | kpm135
I've had some luck with longer soak. Of course that was on a board with severe thermal mismatches so I don't know if it will help your problem or not.
Electronics Forum | Thu Apr 16 09:54:12 EDT 2009 | davef
We know virtually nothing about your process, but here's some guesses: * Turn-off the nitrogen * Change from Sn63 to Sn62 * Change to a low-tombstone paste * Change the thermal recipe: slower ramp, longer soak * Do a better job of placing components
Electronics Forum | Fri Apr 17 10:44:29 EDT 2009 | rmitchell
Hi, follow up, Thanks to everyone that responded. We finished the build, the sun burst thru the clouds and the birds sang. Well that was a slight exageration. Sorry for lack of detail on the original post, I was frazzled. Since the 0201's were p
Electronics Forum | Fri Apr 24 10:21:57 EDT 2009 | ratsalad
I haven't seen those names in a while. I used to work with them; the ones from Plexus anyway. That must be from about 2000 or 2001, I think that's about when Michael Yuen left the company. I haven't read through this yet, but Mr. Yuen is a very sh
Electronics Forum | Thu Feb 24 11:02:29 EST 2000 | mark scheunemann
I am looking to discuss 0402 issues, specifically tombstoning/unsoldered. Any recommendations on pad size/spacing, stencil design etc would be helpful. Placement and reflow profile look good.
