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November 2012

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From:
Mike Fenner <[log in to unmask]>
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Date:
Thu, 15 Nov 2012 11:09:58 +0000
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Yes John but there are lots of Sn/Pb pastes that can take a Pb-free reflow,
but such products whether no clean or water wash don't answer the question.
Mostly because its such an odd situation to hypothesise and because things
like:
OF what is the 3%?
By weight or by volume?

So I think some issues have been conflated, or something bas has happened
like An error on line with paste types.
So I don't think we can help until the situation has been probed a little.

Best Wishes
 
 
 
Mike-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Wednesday, November 14, 2012 10:03 PM
To: [log in to unmask]
Subject: Re: [TN] SnPb and Pb-free paste mixture

Hi Amol how is life at AFG??

 I would advise that they use leaded solder (heh heh) reflow at lead free 
temperatures peaking at say 240C and use a flux that is rated for lead 
free soldering. Such a leaded/flux combination can be obtained from AIM 
WS-488 63/37 is the part number for the paste

Best regards


John Burke

General Manager/COO

Zollner Electronics Inc
Plant Milpitas
575 Cottonwood Drive
Milpitas, CA 95035
Phone:          + 1 408 434 5442
Fax:            + 1 408 434 5401
Mobile:         + 1 408 628 2433
E-mail:         [log in to unmask]
Internet:  www.zollner-electronics.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
Sent: Tuesday, November 13, 2012 4:05 PM
To: [log in to unmask]
Subject: [TN] SnPb and Pb-free paste mixture

Hi,
We have this unusual (at least for me) request from a potential new
customer. This is taken verbatim from their request for process 
information.
Before I go and tell them this cannot be done, I want to ask the experts 
out
on technet if they have seen/done something like this. My thinking is that
this would be very hard to do on the floor unless there is a custom
formulation available. I am not aware of their reasoning for asking this
other than for a very unusual (and ineffective) way of mitigating tin
whiskers. Leaving the potential flux incompatibilities aside, is this
something that is being done/can be done? I could use some expertise or
references/studies on # 2 as well.


1.       "Since our products are not subject to RoHS and our customer is 
not
requiring lead mitigation, is there a vendor preferred process of Pb based
or Pb-free processing.

a.       Describe your history/experience and process for adding ~3% Pb to
Pb-free paste and utilizing Pb-free processes.

b.      Any quality or reliability concerns adding ~3% Pb to Pb-free
soldering.

c.       Describe your history/experience and processes used in
transitioning a product from Pb to Pb-free (or reduced Pb).

2.       Do you know of any issues with RoHS and reliability at -65C?"

Thanks,
Amol

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