Eric,
So your question is... what is the shelf life for MS parts, with regards to moisture intrusion?
There is none, but you do have a couple of possibilities.
1. Your parts are stored in a dry-box or in protective packaging and they are ok to use (per the humidity indicator card) when needed.
2. Your parts are stored in moisture barrier bag with desiccant, but they are on the shelf long enough for moisture to make its way into the bag/part/desiccant such that the parts must be baked out prior to use. The length of time that it takes for this to happen will depend on the transmissivity of the bag, the amount of desiccant, and the environmental conditions of storage.
3. Parts are not stored with any kind of moisture protection and must be baked prior to use.
Ben
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric CHRISTISON
Sent: Wednesday, November 04, 2009 10:34 AM
To: [log in to unmask]
Subject: Re: [TN] Component Shelf Life
What about moisure sensitivity? I'm thinking about MSL classifications
which are outlines in a Jedec spec which I can't lay my hands on right
now? A bit of a vague question.
Regards,
Bev Christian wrote:
> Paymon,
> Gregg hit it on the nail head.
>
> In addition, it is going to depend on finish, finish thickness (varies)
> and what your level of acceptability is (which IPC class product do you
> build?).
>
> I also do not know of a published, recent standard on this topic.
> Bev
> RIM
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
> Sent: Wednesday, November 04, 2009 9:54 AM
> To: [log in to unmask]
> Subject: [TN] Component Shelf Life
>
> Dear Colleagues,
>
> I am looking for a standard for component shelf life. Is anyone aware of
> such document?
>
> Best Regards,
>
> Paymon Sani
> Quality Engineer
> Creation Technologies
>
> Office: 905.754.5000 x 5363
> 110 Clegg Road | Markham, ON, Canada | L6G 1E1
> [log in to unmask]<mailto:[log in to unmask]> |
> www.creationtech.com<http://www.creationtech.com/>
>
> [cid:[log in to unmask]]Working together to build the future
>
>
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--
Eric Christison Msc
Mechanical Engineer
Consumer & Micro group
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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