Electronics Forum: conformal coat underfill (Page 1 of 106)

BGA underfill necessary with conformal coat?

Electronics Forum | Wed Mar 27 18:23:01 EST 2002 | kmorris

Does anyone have experience doing conformal coating over Plastic BGA in High-Rel PCB assembly? Is underfill necessary to avoid problems with entrapped air, etc? Our application is a 17x17mm BGA, 256 I/O. We are assembling with a water soluable pas

BGA underfill necessary with conformal coat?

Electronics Forum | Mon Apr 01 13:00:27 EST 2002 | BTaylor

We had a problem with conformal coating getting under an IC and with Temp. and vibration would cause cracking of the solder bump, underfill solved the problem.

BGA underfill necessary with conformal coat?

Electronics Forum | Mon Apr 01 20:33:30 EST 2002 | davef

Regarding your underfil ... * What material did you use as an underfil? * What machine and technique did you use to apply the underfil? * What type of component were you underfilling? * What was the end-use environment?

BGA underfill necessary with conformal coat?

Electronics Forum | Wed Apr 03 10:50:06 EST 2002 | BTaylor

Any time Dave I can tell from your responses you have been around this block as many times as I have.Your right automotive is tough nowadays not only from the quality standpoint, now they want everything for free.

BGA underfill necessary with conformal coat?

Electronics Forum | Tue Apr 02 11:21:46 EST 2002 | BTaylor

davef I assume this question is for my reply and me. We used a dexter\hysol underfill and a Camalot 5700 to dispense.Single line technique next to a small IC with 14 bumps around the perimeter.The conformal coating was applied with a small brush aro

BGA underfill necessary with conformal coat?

Electronics Forum | Tue Apr 02 22:52:38 EST 2002 | davef

Tks BT Can't be many places tougher than automotive, 'cept maybe oil field, down pipe. We use Dexter Hysol flow underfills for both 1 thou and 3 thou gaps, but they wouldn't come close to filling under a BGA. Most BGA are sitting about 16+ thou fr

BGA underfill necessary with conformal coat?

Electronics Forum | Wed Mar 27 21:20:30 EST 2002 | davef

There is two major BGA coating camps. * Camp #1: "We require the coating to be under low stand-off devices but with no filleting. So we apply a thinned dip coat first, and then top-off with a proper spray coat" * Camp #2: "We want no coating under th

Bubbles in conformal coat

Electronics Forum | Thu Aug 27 11:35:07 EDT 2009 | davef

There are many possibilities: * Conformal coat is incompatible with surface residue on the board * Conformal coat is incompatible with solder mask on the board * Moisture is out-gassing from the board * Conformal coat is too thick and does not allow

Bubbles in conformal coat

Electronics Forum | Thu Aug 27 08:34:50 EDT 2009 | floydf

I am having trouble with little air bubbles in my conformal coat. It ranges from a few pin sized bubble to looking like spit. We are using Dow 2620 silicone conformal coat applied with a PVA sprayer machine. The conformal coat comes in bladder bags t

Bubbles in conformal coat

Electronics Forum | Fri Oct 09 16:07:30 EDT 2009 | dlabelle

We use Dow 2620 silicone conformal coat applied with PVA1000 sprayer machine. If used on a daily bases, we have no problem. If we let the machine sit idle for over a week, we will get bubbles in the conformal coating. Sometimes, purging the line w

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