Electronics Forum | Wed Sep 23 07:51:28 EDT 2015 | kkay
We have been experiencing an issue where our Panasonic film caps on a board are losing their rated capacitance. We are well within their recommended reflow specs and no other operation exposes the part to a temp of more than 160°C. The caps will read
Electronics Forum | Thu Sep 24 09:28:13 EDT 2015 | rgduval
No direct experience with this particular issue....but, I do know that measuring capacitance can be tricky. How are you arriving at this conclusion? Are you measuring the caps on the bench before assembly, and then on the boards post assembly? Cap
Electronics Forum | Thu Aug 23 20:56:08 EDT 2001 | davef
Print paste on tempered glass, place the parts, and reflow. What's the story?
Electronics Forum | Mon Aug 27 10:58:44 EDT 2001 | Ryan Jennens
Steve- We had the same trouble with 0805 Panasonic film caps. We had some tombstoning and open solder joints (non-wetting). We found two problems...like you, we changed our pad design to meet their recommendation. Also, they were able to suppl
Electronics Forum | Thu Aug 23 16:01:59 EDT 2001 | Steve
You made the statement "The rest of the board we use them on looks great..." My question is, what's the difference between the assemblies? Mass? Solder? Oven? Are the boards the same thickness, are other parts causing heat sinking, etc. The reflow m
Electronics Forum | Tue Aug 28 16:07:09 EDT 2001 | slthomas
Just talked to my component engineer. We use the B parts also, and apparently the B suffix indicates compatibility with wave or reflow applications, X is for reflow only. Since we only reflow these parts, sounds like that might be the best route fo
Electronics Forum | Thu Aug 23 15:45:48 EDT 2001 | slthomas
So, we've already addressed the tombstoning on these guys by adopting the mfr's (Pana.) recommendations for pad size and spacing. Problem is, we have pretty bad wetting of some of these parts. The rest of the board we use them on looks great, nice
Electronics Forum | Thu Aug 23 16:41:06 EDT 2001 | slthomas
Naw, the rest of the BOARD we use them on. Same assembly. Actually we use them on one other assembly and have the same problem. Same oven, same line, same paste, same problem. I've tried to get the production super. to move them to another line w
Electronics Forum | Fri Sep 25 00:54:39 EDT 1998 | Charles Sullivan
Does anyone have process experience with SMT Panasonic Film Caps or SMT Film Caps from others? What advice can you give on special process precautions.....or special handling? Today we found cracking between the body and terminations after reflow..
Electronics Forum | Thu Jun 15 17:59:28 EDT 2006 | slthomas
I have in the past had lots of problems with soldering film caps (same problems as you), but that was mostly before the manufacturer redesigned them. Profiles and changes in paste netted some improvements but it really took changes at their end to re
