IMHO, if stored in a reasonably clean environment without special 
conditions, packed assemblies have an almost indefinite lifetime, 
especially with professional-quality components. I have, on several 
occasions, the last only this week, plugged in items 5-10 years old and 
they have worked perfectly every time. I would make one proviso, that 
the circuitry is neither ultra-high impedance (>10E12 ohms) or very 
sensitive to dielectric constant of the substrate.

Brian

On 14/08/2012 04:21, Ivan Feng wrote:
> 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
>
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