Can anybody out there provide some guidance on specifying moisture barrier
packaging requirements?  IPC/JEDEC J-STD-020 is very clear in explaining
how to determine the MSL rating of a package.  And very clearly states that
anything that fails Level 1 "must be dry-packed".  Although it gives a
reference for labeling (JEP 113), it gives no references for moisture
barrier materials or dry-pack systems.  It doesn't even reference its'
companion document, J-STD-033.

Comparing J-STD-033 to EIA 583 reveals a couple of MAJOR differences.

J-STD-033 requires a bag with WVTR of 0.002 maximum.  And also requires 10%
MIH (Max Interior Humidity inside bag)
EIA 583 Class 1 requires a bag with WVTR of 0.02 max and Class 2 is only
0.08 max.  MIH is apparently left up to the user as information is provided
for 20%, 30%, 40%, with a formula to use for calculation at other levels.
And no guidance for determining safe MIH levels.  What's a poor supplier to
do?

There are obviously huge differences in cost, amount of desiccant required,
storage life, etc... between J-STD-033, EIA 583 Class 1 and EIA 583 Class
2.  Any guidelines out there for how to choose?

Thanks,
Nancy

Nancy Reynolds
Product Manager
KEMET Electronics

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