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Subject:	Re: Immersion Gold Fabrication Processes / Specifications
From:	doug smith <[log in to unmask]>
Reply To:	"TechNet E-Mail Forum." <[log in to unmask]>, doug smith" <[log in to unmask]>
Date:	Wed, 2 Jun 1999 09:36:12 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (90 lines)

1. - Are there any specifications (IPC or other) which should be referenced
in the PCB fabrication
drawing for NiAu finishing?

You should indicate your desired finish in the fab notes using the term "Electroless Nickel/Immersion Gold". You can also specify thickness minimums if this finish is not addressed in your standard PCB fabrication spec. Normally a minimum of 100 micro inches Nickel and 3 micro inches Gold. The gold is a self-limiting process and will generally produce about 3-7 micro inches.

2. - At what point during fabrication is NiAu normally applied - before or
after LPI soldermask (or both)?
If both, what are pros / cons of each? Is it important to outline
desired Fab processing in the
fabrication drawing?

It is not a good idea to specify any kind of processing restrictions on the fab drawing. Specify what you want as a finish result, but do not put restrictions on methods. The Ni/Au finish is applied after soldermask, but this need not be specified on the fab drawing. Notes should always be a simple as possible and not duplicate information already present in a general spec.

3. - What sources of NiAu info are available on the web?

Here's an excellent source for info...

http://www.automata.com/capblity/fab/immerau.htm

Doug Smith
Technical Support Engineer
Yamamoto Mfg. (USA), Inc.

(408)944-8308

[log in to unmask]

FAX (408) 944-1361

>>> David Schaefer <[log in to unmask]@yusa.com> 05/27 10:49 AM >>>
Can anyone provide some information on the questions listed below:

1. - Are there any specifications (IPC or other) which should be referenced
in the PCB fabrication
drawing for NiAu finishing?

3. - What sources of NiAu info are available on the web?

Thanks,

Dave Schaefer
PWB Design Technical Lead
NORTEL Broadband Wireless Access
14 Fultz Boulevard
Winnipeg, MB R3Y 1V3

Phone: (204)631-2298 ESN 771

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