For RoHS bds going thru lead-free high temperautures, PCB
fabricators should be defaulting to the new version of
FR4's. The new version has improved reliability at higher
temperatures. In addition to a high Tg of >170C, they have
a Td of >330C. This is the the temperature where the
laminate begins to degrade.
Thank you,
Eddie Rocha
South Bay Circuits
Roger,
I am wondering if we can make your last statement so
definitive. During
the early 90's boards were not made as well as they are now
and we did
have to bake them - from certain manufacturers. I am
wondering with the
higher temperatures for Pb-free soldering if we might see
the problem
raise its ugly head for some of the lower end suppliers. I
don't know,
I'm just asking.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger
Stoops
Sent: May 11, 2005 9:52 AM
To: [log in to unmask]
Subject: Re: [TN] MSL?
MSL = Moisture Sensitivity Level, defines and characterizes
how an
IC/xstr/dio/etc. package will withstand exposure to
temperature and
humidity over time. Specifically important for defining
what process or
procedure to use in assembling semiconductors to a pcb.
The MSL level
has become more of an issue with RoHS due to the elevated
reflow temps.
J-STD-020 describes this in more detail; the lower the
number, the more
robust the part. The Jedec std is free on the 'net.
Doesn't really pertain to PCBs.
Regards,
Roger
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie
Rocha
Sent: Tuesday, May 10, 2005 6:23 PM
To: [log in to unmask]
Subject: [TN] MSL?
I'm a PCB fabricator, and I have a survey asking me several
general
questions related to RoHS with one being moisture
sensitivity level
(MSL)? What exactly are they looking for? Does this
pertain to bare
PCB's?
-- Thanks,
Eddie Rocha
South Bay Circuits
(480) 940-3125 x122
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