Anything over 1 gigahertz is going to have issues with any flux residues
left behind. Lots of good papers on this subject out there.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
Sent: Thursday, March 12, 2009 2:39 PM
To: [log in to unmask]
Subject: Re: [TN] ROL1 RUMOR
Let me use "Doug's line"
It depends on your definiti
Let me use "Doug's line"
It depends on your definition. What is a Hi-Rel board. The
telecommunication companies have been using R0L0 and RoL1 RMA type
("Leave Behind") fluxes for a very long time on products that require
25+ years of reliability. Even in the telecommunications wireless world
with frequencies up to a couple of GHz these fluxes are used without
cleaning. Now if you tell me that you need to clean Hi-Frequency boards
otherwise you'll have inductive crosstalk then I'd believe that but it
would depend heavily on your definition of "Hi-Frequency".
Regards,
George
George M. Wenger
Andrew Wireless Solutions
Senior Principal FMA / Reliability Engineer 40 Technology Drive, Warren,
NJ 07059
(908) 546-4531 [Office] (732) 309-8964 [Cell] [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wilson, Bob
Sent: Thursday, March 12, 2009 3:15 PM
To: [log in to unmask]
Subject: Re: [TN] ROL1 RUMOR
Agreed.
I took a class at UCLA with Bob Hanson. He stated that Hi-Rel boards
need to be clean but the best way is to use RMA, then next-best is WSP
(Water Soluble Paste) then last is NC (No Clean).
But they do have to be clean.
If the Hi-Rel boards aren't clean, then they cause inductive crosstalk.
Bob Wilson
-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Thursday, March 12, 2009 12:00 PM
To: TechNet E-Mail Forum; Wilson, Bob
Subject: RE: [TN] ROL1 RUMOR
No it isn't. High speed stuff needs to be clean of any residues.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wilson, Bob
Sent: Thursday, March 12, 2009 1:02 PM
To: [log in to unmask]
Subject: Re: [TN] ROL1 RUMOR
But...but...RMA is required on high-speed stuff!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, March 12, 2009 11:00 AM
To: [log in to unmask]
Subject: Re: [TN] ROL1 RUMOR
I heard from both our Kester and Alpha reps that there was a consensus
to drop RMA flux materials due to the fact that so few companies use
this formulation anymore. The ROL0 and ROL1 fluxes are more difficult to
clean, solvents are required and are expensive, water soluble fluxes are
much easier to completely remove, and at the same time all of the
commercial side of the industry has typically gone to no-clean flux
formulations. So some of the solder paste, flux, and wire vendors are
taking a long hard look at continuing to make these products to a
dwindling customer base.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: Thursday, March 12, 2009 12:31 PM
To: [log in to unmask]
Subject: [TN] ROL1 RUMOR
Heard a rumor from one of my colleagues that ROL1 solder flux would no
longer be manufactured.
I find this extremely hard to believe. Has anyone heard this rumor?
Just curious.
Thanks.
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
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