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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah
Sent: Thursday, September 15, 2011 2:19 PM
To: [log in to unmask]
Subject: Re: [TN] ENIG versus LFHASL
I am in favor of LFHASL because of its robust in processes and storage
conditions. You just have to choose the right alloy in the HASL process.
You can search in the IPC archive and read Werner recommendations, he
was
favor of Immersion Silver and against ENIG because of the Ni3Sn4 IMC
layer,
High thermal energy (15 degC) at reflow soldering, lnferior electrical
properties of solder joints and other reasons such solder d black pads.
Reuven
On Thu, Sep 15, 2011 at 8:00 PM, Phil Nutting
<[log in to unmask]>wrote:
> Hello Technetters,
>
> We are having a discussion about the merits of both ENIG and LFHASL.
In
> 2006 when we switch to a RoHS compliant process we evaluated many
board
> finishes and decided, for our volumes, that although ENIG was more
expensive
> it was more robust. LFHASL wasn't ready for prime time, Immersion
Silver
> was great but required careful storage and handling, OSP was not
something
> that fit our process.
>
> Now that LFHASL appears to be more main stream we are reconsidering
it.
> ENIG is not always done in-house at some of our fab shops, so that
adds
> time and money to the delivery. These shops now have LFHASL in-house,
so
> there is a potential for some savings here. We have been given
stories of
> storage issues with LFHASL and other concerns too.
>
> As I recall, the industry recommended method of storage of bare
circuit
> boards is in a sealed bag with desiccant, regardless of board finish.
> Leaving bare boards unwrapped and in an open bin is just plain bad
practice
> especially if near the ocean.
>
> Several of us here think LFHASL is now right for our processes.
>
> Please advise if we are off base.
>
> Phil Nutting
> Design for Manufacturing Engineer
> Kaiser Systems, Inc.
> 126 Sohier Road
> Beverly, MA 01915
> Phone: 978-922-9300 x1310
> Fax: 978-922-8374
> e-mail: [log in to unmask]<mailto:[log in to unmask]>
> www.kaisersystems.com<http://www.kaisersystems.com>
>
www.linkedin.com/in/philnutting<http://www.linkedin.com/in/philnutting>
>
>
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--
Best Regards,
*Reuven Rokah*
Mobile: 972-52-60-120-18
Tele-fax: 97239360688
<http://www.rokah-technologies.com/>[log in to unmask]
[log in to unmask]
www.rokah-technologies.com
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