Paolo,

That is to prevent charge build-up that consequentially, might cause
unwanted electric static discharge (ESD) that can damage the electronics.
The general, most idealistic scenario is 60% humidity (plus other
ESD-preventive handling procedures). In the satellite/space industry, there
are guidelines that require the humidity of the assembly environment
between 40 to 60%. Then again, it depends on the application of the device
(it should). For lack of actual experience, I'm afraid I can't tell you if
it's adequate at 20% or overkill at 60%.

Any thought, anyone?


>MEMS PACKAGING ISSUES AND MATERIALS
>KEN GILLEO Cookson electronics
>Adavanced Microelectronics Nov/Dec2000
>"The ideal range for humidity into package appears to be somewhere
>between 20% and 60%."
>What do you really think about this?