Hi Mike,
The issue is PCBAs (already assembled PCBs).

On Tue, Aug 14, 2012 at 3:55 PM, Mike Fenner <[log in to unmask]> wrote:

> HI
>
> In storage the bare boards will suffer from ingress of moisture and loss of
> solderability, the longer you keep them the more they are affected. Baking
> the boards to dry them can/will degrade solderability.
>
> Properly packed and stored unopened in original packaging per IPC
> recommendations, industry wisdom would be something like: expect to see up
> to a year for most finishes. Exceptions are immersion tin and some OSP
> which
> will only go 6 months
> Probably the longest lasting finish would be Sn/Pb HASL.
> NO doubt others will have opinions and probably someone will have stored
> PCBS for some outrageously long period OK :)
> What you actually get is an it depends - not just on the quality and type
> of
> finish, but on the criticality of your own designs and processes as well as
> how stored.
> IOW, in a perfect world you would work out what you can or can't do. In
> this
> world... this topic is a perennial favorite and you will find many
> references in the TechNet archive.
> Anyway first look at IPC standards, there is one for just about everything
> you can think of. 1601 for board storage and J-003 for board solderability
> testing would be good places to start. These will help you Either determine
> what you should be doing; or confirm that what you are doing is correct.
>
>
>
> Regards
>
>
> Mike Fenner
>
> Bonding Services & Products
> M: +44 [0] 7810 526 317
> T: +44 [0] 1865 522 663
> E: [log in to unmask]
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ivan Feng
> Sent: Tuesday, August 14, 2012 2:22 AM
> To: [log in to unmask]
> Subject: [TN] PCBA shelf life
>
> Folks,
>
> Bare PCB has a shelf life depending on its surface finish, component like
> electrolytic capacitor and MSD devices also have defined shelf life.
> But for PCBA, how to define its shelf life? Is there any applicable
> standards?
>
> Any suggestions are welcomed.
>
> Regards
> Ivan
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>



-- 

Best Regards,

*Reuven Rokah*

Mobile: 972-52-6012018
Tel:        972-3-9360688
Fax:          076-5100674
 <http://www.rokah-technologies.com/>[log in to unmask]
[log in to unmask]
www.rokah-technologies.com

**
This e-mail message is intended for the recipient only and contains
information which is CONFIDENTIAL and which may be proprietary of Rokah
Technologies. If you have received this transmission in error, please
inform me by e-mail, phone or fax, and then please delete all of the
original files and all other copies exist.


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________