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March 2005

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Subject:
From:
James Vincent <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Mon, 7 Mar 2005 13:45:36 -0000
Content-Type:
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text/plain (83 lines)
Werner

The IDEALS project arrived at a statement pretty much along the lines
you criticize below back in 1998/9 (we said "functionally equivalent" if
memory serves), and many have since.  I agree that caveats are required
to circumscribe statements on "reliability", but clearly it is the case
that practical experiments on real PCBs do show (and here I search for a
phrase) a broad correspondence in behaviour between SnPb and Pb-free.

So, at what point can we believe the evidence of our eyes?  What will
define, say in IPC-7095 terms, the believable test?

Regards

James

James H Vincent
Lead Engineer, Reliability Engineering
Bookham, Caswell
+44 (0)1327 356318
 

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] 
Sent: 07 March 2005 12:07
To: [log in to unmask]
Subject: Re: [LF] useful links

Hi Dave,
Unfortunately, to many of this kind of pronouncements "that SAC has been
proven at least as reliable as
SnPb" are made by people who do not understand solder joint reliability.
And
unfortunately, those people are attached to organizations like NIST and
NEMI,
giving their pronouncements underserved weight,

Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com


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