Someone on the forum talked about replacing Aluminium Electrolytic Caps on 'old' pcbs during servicing. I think they were in the Nuclear Industry.
The caps may need forming before applying power even if you don't replace them.
Rex

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: 14 August 2012 16:31
To: [log in to unmask]
Subject: Re: [TN] PCBA shelf life

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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