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October 2001

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Subject:
From:
Neil Atkinson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 16 Oct 2001 16:17:56 +0100
Content-Type:
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The classic book on this subject is 'Statistics for Experimenters' by Box,
Hunter and Hunter.  I can recommend it.

Neil

-----Original Message-----
From: Crepeau, Phil [mailto:[log in to unmask]]
Sent: 16 October 2001 15:32
Subject: Re: Lead Free Surface finishes


hi,

i'd like to recommend a great book that can get you started on a doe.  it's
'design for quality' by lochner and matar.  amazon has it.  it clearly
explains the entire process in engineering terms, and it has lots of
complete, unambiguous, every day practical examples.  no six sigma training
necessary.

phil

-----Original Message-----
From: Neil Atkinson [mailto:[log in to unmask]]
Sent: Tuesday, October 16, 2001 1:11 AM
To: [log in to unmask]
Subject: Re: [TN] Lead Free Surface finishes


Graham,

I agree with Bev.  A DOE can be designed to reduce the permutations needed
and still get good results.  You need to be talking to a good statistician
or (dare I say it) someone who has done a six sigma course.


Neil

-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: 15 October 2001 14:49
Subject: Re: Lead Free Surface finishes


Graham,
Since you are looking at SIR/EM type testing an not solder joint testing,
then things like spacing and voltage gradient, etc are more important than
part type.  So to cut cost (if you have not already bought your coupons),
design a board with fewer component types, use all surface finishes and run
it as a DOE so you do not have to use every different combination of
variables.

regards,
Bev Christian
Research in Motion

-----Original Message-----
From: Graham Naisbitt [mailto:[log in to unmask]]
Sent: October 15, 2001 6:52 AM
To: [log in to unmask]
Subject: [TN] Lead Free Surface finishes


Techies and (I guess - Leadies?)

We are about to carry out some reliability test work, examining the
influences of electro-chemical reactions using SIR techniques.

The manufacturing process that will be employed involves lead-free soldering
materials, water based fluxes and water based conformal coatings. The
methodology we shall employ shall be as drafted in a new IEC draft spec
6-1189.

The coupon we will use is intended to model mixed technology as closely as
possible. We include through-hole connectors, J lead SOIC's, BGA 225, SMT
Capacitors and QFP 160.

We will use an LPIM resist and were going to examine 4 different surface
finishes:

NiAu (ENIG)
ImSn - Immersion Tin
ImAg - Immersion Silver
OSP

However, and to get to the question: We can't afford all these permutations
so, we shall select only one surface finish. Can you folks advise the most
popular surface finish that is likely to be used for lead-free processing?

Please, we would REALLY like a simple answer rather than to open a huge
dialogue - 'cos we have to get the testing done by Mid November and we have
yet to have the coupons made!!

Awaiting your replies with interest.

Regards, Graham Naisbitt

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