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February 2015

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Subject:
From:
"Nutting, Phil" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Nutting, Phil
Date:
Wed, 11 Feb 2015 23:15:32 +0000
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Dale,

No "it depends" here.  We have had issues mostly with PTH Avago Opto devices.  Apparently optos do not use the same sealing technique used in other ICs, transistors, diodes, etc.  Although I do not believe boards we built in-house have failed from this, I can say that some built by one of our CMs did have significant failures.

Avago came in and asked what they could do to make things better.  Well duh, seal the parts.  After waiting three years Avago finally came out with a white paper on how to install their optos.  It boiled down to not using halide containing flux and controlling the pressure of the post soldering wash as found in very tiny print on their data sheets.

Curious that I do not recall the same type of failures on the SMT version of the parts.

We have had some issues with circuit board mounted relays but not as many and I cannot confirm the cause of the failures although some engineers jumped to conclusions.

Best regards,

Phil Nutting

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dale Ritzen
Sent: Wednesday, February 11, 2015 5:25 PM
To: [log in to unmask]
Subject: [TN] Incursion of fluxes into electronic device packages

Hello Technetters,
Has anyone ever experienced issues with solder paste flux (or potentially flux from cored wire solder or wave solder or selective solder processes) penetrating into a chip package during reflow or cleaning or whatever? One of our customers has asked about it and I know of no incidents like this. Their question applies to all types of flux in general. But, I thought someone out there may have run across this in their travels. 

I'm trying to figure out just how that could possibly happen with all the package retooling for the higher temperature RoHS processes, but I will rely on your vast experience and knowledge to provide the right answers.

I am waiting for all the "It depends..." answers to start rolling in!

Thank you in advance,
Dale Ritzen, ASQ CQA
Quality Manager / ISO Management representative
_____________________________
Austin Manufacturing Services

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