Hi Ioan,
Since what we are most woried about is surviving soldering, a
solderfloat test is what is best. While either IST and HATS tests on
coupons can give you basic behavior in terms of long-term reliability,
and some of that info can be useful for an assessmnet of LF-soldering
survivability, neither of them normally tests to soldering T's--perhaps
they could be pushed there, however.
Werner
-----Original Message-----
From: Tempea, Ioan <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, 26 May 2006 12:07:04 -0400
Subject: Re: [TN] Rohs Weeeeeee board material
Yes,
I kinda got lost in my day to day worries and hit send too soon.
So one concern is getting good boards consistently and Richard is on
the money.
Another concern is if the laminate is OK, will the MLB construction be
lead-free
capable too? There was a thread a while back mentioning something about
designs
that would not be that suited for lead-free boards, can't remember
well, but
things about the copper planes have been briefly mentioned. So IMHO,
capable
laminate does not equate capable boards. What tests can confirm the
capability
of a full PCB structure?
Thanks,
Ioan
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard D.
Sent: Friday, May 26, 2006 11:56 AM
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material
That is the purpose of a thorough process/procedures audit done
periodically to ensure the material received is going to be good.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Friday, May 26, 2006 10:50 AM
To: [log in to unmask]
Subject: Re: [TN] Rohs Weeeeeee board material
Hi,
I guess we have a good idea now of the difficulties in specifying and
manufacturing lead-free capable PCBs. The next question that comes to my
mind is how are we going to assess if the PCBs that are well speced are
what we expect?
I mean, the spec can be OK, whether perfect IPC-4010 slash sheets are
developed, or STII is implanted. But the manufacturer might still use
expired prepregs, they can have lamination problems, and so on.
What tests shall a contract manufacturer or OEM with no in-house testing
capability impose, in order to have the confidence that they receive
what they specified?
Thanks,
Ioan
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