Carey Fisher wrote:

>Forrest,
>What's MSL and why does it matter?
>
Others have answered with what it is... basically a rating which has to 
do with absorbtion of moisture from the air which vaporizes during 
soldering cracking the package (or doing other damage).

What is scary is how many packages are at MSL 3 or above.  What is 
biting me are the regulators I want to use which are in a TO-263 package 
which is basically a surface mount version of the TO-220.  Once I open 
the package I have to use all of them within 7 days or I have to bake 
them at 125*C for at least 8 hours to dry them out before I do use them.

-forrest
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