Mike,
You are correct! And I use Indium 5.1 SAC for my SMT with excellent
results. I have tested other Suppliers, but found that Indium has best
overall performance and appearance of my LF products.
Tom
-----Original Message-----
From: Mike Fenner [mailto:[log in to unmask]]
Sent: Friday, December 16, 2005 10:37 AM
To: [log in to unmask]
Subject: RE: [TN] Stencil Design for Lead-Free
A little note of caution: there is some "it depends" according to paste
supplier and possibly your board finish. It is true that with some a 1:1 is
required, due to lack of spread. Others you can use the same or pretty much
the same as your Sn/Pb. If you have a large stencil library this can be a
significant factor.
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Braswell
Sent: 16 December 2005 12:35
To: [log in to unmask]
Subject: Re: [TN] Stencil Design for Lead-Free
Joel,
I have been using 1:1 aps for our LF for some time with no problems.
We are printing 15mil & 20mil pitch with excellent solder wetting to pads
and leads.
Tom Braswell
Manufacturing Engineer
Fawn Electronics
6441 East NC 97
Elm City, NC 27822
Ph: (252) 977-8745
Fx: (252) 977-3477
Email: [log in to unmask]
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Joel Mearig
Sent: Thursday, December 15, 2005 6:42 PM
To: [log in to unmask]
Subject: [TN] Stencil Design for Lead-Free
I am looking for information regarding stencil design for fine-pitch
lead-free applications. I am interested to see what most people are doing
for the aperture size. Are you reducing or going 1 to 1? If you are reducing
what is the reduction formula? Are you reducing the same regardless of
aperture stance to print direction? Any input would be much appreciated.
Joel Mearig
Delta Tau Data Systems, Inc.
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Corporation does not accept responsibility for changes made to this email
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