Electronics Forum: popcorn and caps (Page 1 of 10)

Tantalum caps “popcorn”

Electronics Forum | Thu Apr 25 01:22:29 EDT 2019 | smith88

Out gassing not out fading

Tantalum caps “popcorn”

Electronics Forum | Sat Apr 27 15:45:25 EDT 2019 | smith88

Thanks I appreciate the information

Tantalum caps “popcorn”

Electronics Forum | Sat Apr 27 10:43:25 EDT 2019 | smith88

I have read this I guess the question I should be asking is what have you done when finding these? IPC says it enters the body so it is a defect many in my group feel it should not be because they are not hermacticaly sealed anyway. I am needing thou

Tantalum caps “popcorn”

Electronics Forum | Thu Apr 25 01:20:58 EDT 2019 | smith88

I am having fractures in my tantalum caps, I believe it is from out fading but I am having a hard time convincing others. Where they are not hermatically sealed are thes fractures a concern? Moisture is entering the body regardless of the fractures?

Tantalum caps “popcorn”

Electronics Forum | Thu Apr 25 11:30:09 EDT 2019 | davef

Numerous technical papers on the web document the moisture sensitivity of tant caps. Here's one: https://nepp.nasa.gov/DocUploads/CE5125B5-E0EB-4CFA-8867BE3F3E342CA5/moisture%20effect%20Ta%202C%20M.pdf

Tantalum caps “popcorn”

Electronics Forum | Sat Apr 27 15:42:53 EDT 2019 | davef

Your ppl are correct, the capacitor is not sealed. So, it is perfectly acceptable for the capacitor to have absorbed moisture. If your ppl don't either prevent moisture absorption or remove the moisture prior to soldering, their component could fail

Decoupling caps and PCB layout

Electronics Forum | Wed Aug 10 02:38:36 EDT 2016 | zxcvb

I guess I've been somewhat ignorant when it comes to the finer details of pcb layout. Lately I've read a couple of books that try their best to lead me on the straight and narrow. Here is a couple of examples of a recent board of mine, and I have hig

Solder beads on small caps and res.

Electronics Forum | Wed Nov 29 14:49:38 EST 2006 | MS

Any recommendation to reduce solder beads next to 0402, 0603 and 0805 caps and res? What about home plate vs. bow tie stencil aperture design?

Solder beads on small caps and res.

Electronics Forum | Wed Nov 29 17:00:40 EST 2006 | John S.

We've used both effectively to resolve this issue. Check with your stencil manufacturer. Often, they can give you a very good starting place on issues like this since they see everyone's designs. John S.

Solder beads on small caps and res.

Electronics Forum | Wed Nov 29 17:05:15 EST 2006 | slthomas

I have used a 10% area reduction with home plates on 6 mil stencils with good success. If you're using 5 mil stencils you might go with 0 or 5% reduction.

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