I believe that Werner has made an excellent synopsis of this issue as a
whole. Besides the CASTIN data "discussed", does anyone else have any
Pb-free alloy reliability data or data information?
I (and/or my boss, Karl Seelig) will be at the IPC Works, and we certainly
will discuss those test results then.
See all of you there!
David
-----Original Message-----
From: Werner Engelmaier <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Tuesday, July 06, 1999 4:56 PM
Subject: Re: [LF]
>Hi Bridget, David, & All,
>Bridget asks:
>>* What is the accepted reliability time span for the product
(CASTIN)?
>and David answers, very correctly:
>> This really will be dependent upon component and board types and
>geometries, etc, and then accelerated fatigue testing should be performed
as
>a comparison to Sn/Pb solders.
>Earlier David responded to my query regarding the reliability testing
>performed on CASTIN with:
>>You are absolutely correct. Obviously, reliability issues remain the
>>greatest concern in the switch to pb-free solders.
>>However, please note that CASTIN was deemed to be more reliable than
>>Sn63/Pb37 in -40/125C and -40/85 testing. Of course, our reliability
testing
>>is an ongoing process. I will keep all of you apprised on the results of
>these.
>I have, unfortunately, seen too many inadequate accelerated test from which
>conclusions were drawn whichwere not warrented by the results and in a
number
>of cases wrong and misleading.
>Therefore, I urge everyone who is willing to share data to give full
details
>of the test, procedures, test vehicles and substrates with dimensions,
>measured CTEs, measured solder joint heights (for leadless like BGAs and
>CGAs) and properly determined lead stiffnesses for leaded attachments. In
>general, to repeat myself, you can not go wrong very far following
>IPC-SM-785; but, Boy!, have people gone wrong without it. And if claims are
>made for a solder product, thid kind ofdetailed disclosure is mandatory, as
>far as I am concerned.
>So, David, have the test performed for AIM on CASTIN been published
anywhere;
>if not, IPCWorks'99 with its LF Forum would be a grand opportunity.
>
>Werner Engelmaier
>Engelmaier Associates, L.C.
>Electronic Packaging, Interconnection and Reliability Consulting
>7 Jasmine Run
>Ormond Beach, FL 32174 USA
>Phone: 904-437-8747, Fax: 904-437-8737
>E-mail: [log in to unmask], Website: www.engelmaier.com
>
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