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April 2003

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Subject:
From:
"Barmuta, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 24 Apr 2003 13:38:19 -0700
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Russ:
Cost: The Ni sulfamate plating step is not exotic or unusual for fabricators
doing Ni/Au plating. If the board fabricator is set up to do deep/full panel
Ni sulfamate electroplating I would not expect added cost. They would not
have to strip the etch resist metal and would not have to hot air level, so
it should be a push at least.
I'm assuming, looking at the notes that the fabricator could do a single
plating step of sulfamate Ni for a final finish. By plating a minimum of
0.0038mm (@150u"), there is no minimum called out for the wiper area, with a
nominal of 200u" over the entire board surface it would meet the drawing
call out.
If a double plate with two thickness' of Ni is required then it would be
costlier than HAL/SMOBC.


Soldering: You may have a difficult time trying to activate and solder to
the nickel depending on your SM solderpaste flux. Baked Ni(30-60mins/300F to
cure the soldermask at the fabricator)could be a real bear to solder to.

Why don't they put 15-20u" of electroplated hard Au over the Ni and make
everyone happy? That should provide sufficient wiper life and provide a good
solderable surface.



Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076

-----Original Message-----
From: Russ Steiner [mailto:[log in to unmask]]
Sent: Thursday, April 24, 2003 7:55 AM
To: [log in to unmask]
Subject: [TN] Sulfamate NI??


I have a couple basic questions on the cost of (to me at least) exotic
coating/plating requirement.  These PCB's are electromechanical in
application as they contain a few passive components and the plating is
also a contact for a mechanical switch wiper contact.  My customer is
calling for the following (on various boards, about 1 dozen p/n's):

1.  200 u-in. of sulfamate mickel plating on wiping surface, matte
finish electroplate is acceptable.
2.  Minimum 100 u-in. of ductile sulfamate nickel plating
3.  Nickel plated, 0.0038 mm min., plated thru holes

Are these spec's going to cost more than HAL/SMOBC in large production?
(Asian PCB source).  Also, is there any issue soldering 1206 and 0805's
in convection reflow on this plating?

P.s.  This is how their notes read. I assume the "mickel" is really
supposed to be "nickel".

Any help would be appreciated. Thanks in advance!


All the best...

Russ Steiner
Manager, Marketing & Business Development
Phone  877-622-EMS1 (Toll-Free in USA)    Phone  989-539-1811 (From
Canada/Mexico)
Fax      877-622-3672
Cell Ph 989-245-2606
"The winds and the waves are always on the side of the ablest
navigators."

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