Agree,
We are having a follow up with our customer to try to understand the rationale behind their question. Thank you for all the insights into the issue.
Regards,
Amol
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Thursday, November 15, 2012 3:10 AM
To: [log in to unmask]
Subject: Re: [TN] SnPb and Pb-free paste mixture
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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