Electronics Forum | Tue Nov 15 14:31:59 EST 2005 | Samir Nagheenanajar
Back in the days when I was in charge of a Paintline Dip conformal coater, I had the same issue with a non-hermetically sealed Potentiometer. We tried to use rubber boots, but the capillary/wicking action of our silicone-based heat cured coating was
Electronics Forum | Wed Aug 15 08:33:31 EDT 2012 | jdumont
Wondering if anyone has ever run across this in their travels. We have gotten a few field returns back in recent months and it appears that many of the balls of the PPC440 CPU BGA (ceramic) have shifted. I know we Xray this part 100% during assy so
Electronics Forum | Mon Feb 12 08:19:47 EST 2018 | dontfeedphils
Yep, that's already in the works, but boots by themselves don't address the wicking issue.
Electronics Forum | Thu Dec 22 15:17:06 EST 2005 | jdumont
How is everyone coating under these connectors? Is RTV covering the outside so nothing can get in an answer? Or very thin silicone to wick under... http://img302.imageshack.us/img302/1728/dscn24450ac.jpg
Electronics Forum | Thu Feb 01 07:41:01 EST 2018 | dontfeedphils
Interesting, never heard of using wax as a coating mask. Not sure how well the AR coating would hold up to a hot alkaline wash (unless you have experience with it), but that stuff usually starts to flake off/de-wet if you just look at it wrong. I'm
Electronics Forum | Wed Jun 08 13:06:36 EDT 2005 | jimby
You will have to machine the part off down to the top of the balls. Wick solder off from individual sites one at a time. All that will be left is Parylene shell where balls once were. Take an orangestick and alcohol to break up and remove. Tricky par
Electronics Forum | Mon Sep 20 13:04:25 EDT 2004 | davef
The Intel BGA Developer�s Guide [ http://developer.intel.com/design/packtech/ch_14.pdf ] says: 14.8.3.3 Plated Through Hole (PTH) Isolation Regardless of the technique used for the mounting pads shape or definition, isolation of the plated through h
Electronics Forum | Wed Apr 19 10:48:36 EDT 2017 | robl
Thanks for the suggestion Rob, this might work > for us in some cases. In most cases though, I'll > need multiple coupons per PCB purchase (a coupon > per coating "setup"). > > Currently talking to > some PCB suppliers to see if anyone can of
Electronics Forum | Tue Feb 03 13:39:08 EST 2009 | grics
Good morning Jamie. I work at a CM and can offer some input on process flexability. I do not have any data on how reliable the coating is but I can say that they are both very difficult to control. Will you be selective coating or full coating? Ho
Electronics Forum | Wed Oct 06 04:23:09 EDT 1999 | Brian
| | I am a new employee at a company that has had a large turnover of employees over the past year. I am working on a board (components on one side only), the engineer (he is also new ) wants to use an .035 pad with a .021 dia. hole, there are no via
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