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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