Richard;

  Intel says that inside the MBB ( Moisture Barriers Bag ) the component can
survive for one year from bag seal date ( Intel storage time plus customer
storage time ) in conditions as critical as 40C and 90% RH. Besides this
fact, the components came with a HIC ( Humidity Indicator Card ) that tells
you if need rebake or not.
  For in Process storage Intels says  you could store  PLCCs and PQFP ( =<
100 leads ) outside MBBs for long period of time if RH is less than 10%.
  This matter is not so simple, the moisture absortion rate is material and
size dependant. I recomend you go to Intel web site and download ( pdf
format ) the chapter 8 of 1999 Intel Packaging Databook, you will find 28
pages about Moisture Sensitivity/Dessicant Packaging/Handling of PSMCs

http://developer.intel.com/design/packtech/packbook.htm

I hope this help

Jorge Dourado de Santana
Maintenance / Process Engr
Microtec - Brazil



> -----Original Message-----
> From: <Richard Tilbrook> [SMTP:[log in to unmask]]
> Sent: 8 de Outubro de 1999 04:37
> To:   [log in to unmask]
> Subject:      [TN] level 6 moisture sensitive smt components
>
> Hi,
>
> I am enquiring into the acceptable conditions [ie. temp. and Relative
> Humidity] for long term storage [ie. 8 to 10 months] of level 6 moisture
> sensitive smt components.
>
> I am aware that moisture sensitive components of levels 2 through 5
> require
> an RH of less than or equal to 20% RH for long term storage, but does this
> apply to levels 5a and 6, or is a lower RH necessary? I ask as I have no
> level 5a information to check on, and level 6 information is individual to
> the component.
>
> Thankyou for taking the time to read this,
>
> Regards,
>
> Richard Tilbrook,
> Junior Engineer,
> British Aerospace.
>
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