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September 2006

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Subject:
From:
"Barmuta, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Barmuta, Mike
Date:
Tue, 12 Sep 2006 13:29:44 -0700
Content-Type:
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text/plain (164 lines)
Chris: If you search the TechNet archives you'll find quite a bit of
information on ionic extraction testing, purpose, application, theory,
etc. This should provide you an informational background to draw on.

To address your question more specifically, if both types of finishes
are done as SMOBC for the ENIG vs. HASL boards:

1. I would expect the ionic contamination levels to be the same prior to
soldermask application. 

2. I would expect the ionic contamination levels to be the same after
soldermask application. However after soldermask is not where you want
to do your second check. You want to check after soldermask, the final
finish application and cleaning.

3. Based on our experience, after the final finish application and
cleaning I would expect the HASL board to be higher in ionics due to the
chemistries and thermal exposures involved.

Please remember low measurements of the average ionic contamination
level of a board does not guarantee it's electrical performance. It is
basically an indicator of the process.

	
Regards
	
Michael Barmuta
	
Staff Engineer
	
Fluke Corp.
	
Everett WA
	
425-446-6076


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball
Sent: Tuesday, September 12, 2006 12:45 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish

The requirement being questioned reads:

BARE BOARD CLEANLINESS MUST BE VERIFIED BEFORE AND AFTER APPLICATION OF
SOLDER MASK USING AN OMEGA METER 600 SMD OR EQUIVALENT HEATED IONOGRAPH.
MAXIMUM CONTAMINATION SHALL NOT EXCEED 0.47ug/cm2 NaCl.

Would you expect ENIG to be at 0.6 while HASL was at 0.8, for example? I
thought there would be a final cleaning that would cause the end result
to
be pretty much the same, regardless.

As is obvious, I don't really know squat about this sort of thing, and
am
relying on the kindness of strangers.... (hello Dewy)

Thanks,
-Chris




                       [log in to unmask]
                       Sent by: TechNet                  To:
[log in to unmask]
                       <[log in to unmask]>                 cc:
                                                         Subject:    Re:
[TN] bareboard cleanliness related to
                       09/12/2006 02:36 PM                 surface
finish
                       Please respond to TechNet
                       E-Mail Forum; Please
                       respond to Wgkenyon2







You might wish to compare ionics, which might not be much different.
However, if you compared non-ionics using TMs 2.3.38 or 2.3.39, you
might
find  quite
a difference.

Bill  Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO  80526
Tel: 970.207.9586 Cell: 970.980.6373
email:  [log in to unmask]


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