Sumxp

The cost comparison of ENIG and ImAg on a board bases can run from 0 to
25% depending upon the location of the supplier. If the supplier is in
China the cost difference is small in North America it may be as much as
25% more for ENIG.

If you are using a Chinese shop you may also want to consider Flash Gold.
All of the Chinese shops I have visited have this process which is
electrolytic gold and nickel. A large fraction of the boards in China are
built with this coating and so far I have not heard of any issues. I have
several customers who have successfully converted from ENIG to Flash Gold.
Normally, the cost is slightly more than HASL, but like everything in
China it is negotiable.

Best regards

Lee

J. L. Parker Ph.D.
JLP Consultants LLC
(804) 779 3389


-----Original Message-----
From: Sumxplore [mailto:[log in to unmask]]
Sent: Saturday, January 14, 2006 12:55 AM
To: Lee Parker; 'TechNet E-Mail Forum'
Subject: Re: [TN] enig bad board

Looks like this is the beginning of my nightmare with more to come after
reading those valuable feedback by technetters.

No,I haven't try immersion silver but certainly I will explore it.Anyone
can
let  me what is the cost differences between Immersion silver and ENIG?

Thank you.

----- Original Message -----
From: "Lee Parker" <[log in to unmask]>
To: "'TechNet E-Mail Forum'" <[log in to unmask]>; "'sumxp'"
<[log in to unmask]>
Sent: Saturday, January 14, 2006 1:34 AM
Subject: RE: [TN] enig bad board


> Sumxp
>
> It is likely the thickness of the gold is inadequate and the underlying
> nickel has oxidized. I would measure the gold thickness (XRF) and
compare
> it to the minimum specified. The silver color after erasing is most
likely
> the nickel that is under the gold and with the oxides removed.
>
> There are many other alternatives these days to ENIG such as immersion
> silver. Have you evaluated into any of these?
>
> Best regards
>
> Lee
>
> J. L. Parker Ph.D.
> JLP Consultants LLC
> (804) 779 3389
>
>
> Best regards
>
> Lee
>
> J. L. Parker Ph.D.
> JLP Consultants LLC
> (804) 779 3389
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of sumxp
> Sent: Friday, January 13, 2006 10:48 AM
> To: [log in to unmask]
> Subject: [TN] enig bad board
>
> Hi,
>
> We noticed few ENIG bga pads black in color instead of gold.It turn
silver
> when use eraser to remove away the black color pad.What is the defect
> mode?
> Any reliability issue?Is it advisable to continue using these pcbs?
>
> Thanks......
>
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