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May 2007

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Subject:
From:
Gary Camac <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gary Camac <[log in to unmask]>
Date:
Tue, 1 May 2007 07:32:17 -0500
Content-Type:
text/plain
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text/plain (132 lines)
Ioan,

I am not using any leadfree.  My company's products are presently
exempt, so my efforts were only exploratory.

The SN100C became available last year after I had already started
processing my leadfree test assemblies.  I was only able to populate
some double-side reflow assemblies using the SN100C. The oven recipe was
the one I had developed for SAC305, with a little boost in the reflow
zone.  We also ran mixed alloy assemblies (reflowed SAC305/wave SN100C).
Board finishes were ENIG and Iag. All assemblies past our qualification
testing.

Gary

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Monday, April 30, 2007 2:31 PM
To: [log in to unmask]
Subject: Re: [TN] SN100C vs. SAC305

Gary,

I've told you I was behind on that. I'll contact AIM. You have tested
it, but are you using it? We still dream about having a standard
material, so that the new developments be faster communicated and redily
applicable by everybody. If the reliability research is mainly on SAC,
who will take care of the SN100C?

John, I've originally sent it to leadfree also, but the message bounced
back. I have to figure this one out. Which brings me back to the
question I have already asked at least twice: why is IPC still keeping 2
forums? TN and LF are practically populated by the same persons, with
the same interests.

Thanks,

Ioan

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gary Camac
Sent: Monday, April 30, 2007 3:03 PM
To: [log in to unmask]
Subject: Re: [TN] SN100C vs. SAC305


Iaon,

Concerning your second bullet point, I successfully tested a SN100C
paste from AIM last year.

Gary Camac 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Monday, April 30, 2007 1:42 PM
To: [log in to unmask]
Subject: [TN] SN100C vs. SAC305

Dear Technos,

I need to know how is this combat evolving. This topic has been brought
up several times, but things change fast right now and there must be
more empirical data on the matter.

What I know regarding the 2 materials can be summarized:

*	Pro SN100C: cheaper, better looking, eats less copper in the TH
*	One major unknown - the Reliability: SN100C is not available in
solder paste format, therefore the boards would have SAC SMT joints and
SN100C TH joints. This means 2 different materials and since we don't
know how reliable a board with only one material is, should we risk
introducing an extra variable?

I would like to know what your take is. Does anybody mixes the 2
materials? Any reliability testing done? How long have you been doing it
and do you see RMAs?

Thanks,

Ioan


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