Ivan,
Just some thoughts
MIL-HDBK 217 had a "Non-Operating" failure rate calculation, based on storage conditions. I've been out of the reliability game for awhile, but could dig into the archives if that would be helpful. It basically gives you a percentage of the predicted failure rate for an operational usage condition. This failure rate can then get you to an availability prediction after so many years.
Are you trying to determine your packaging needs to meet some long term storage requirements or are you trying to define your products given shelf life for a customer? Do they have any defined requirements on what constitutes success i.e. 9 out of 10 units are operational after 5 years of storage.
Jim Carlson
Quality/Configuration Manager
L-3 Communications
Applied Signal & Image Technology
443-457-1111 Ext. 238
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ivan Feng
Sent: Tuesday, August 14, 2012 6:20 AM
To: [log in to unmask]
Subject: Re: [TN] PCBA shelf life
Thanks for all your inputs. Yes it depends, but is there any data or applicable models to model the relation of PCBA shelf life vs. its storage condition. Or any approach to determine shelf life under a given environment.
Thanks
From: Reuven Rokah [mailto:[log in to unmask]]
Sent: 2012Äê8ÔÂ14ÈÕ 13:47
To: TechNet E-Mail Forum; Feng, Ivan(·ëÑ©)
Subject: Re: [TN] PCBA shelf life
Ivan,
Its depend on : storage condition, packaging type, working (yes/no), environment (if at work) etc.
On Tue, Aug 14, 2012 at 4:21 AM, Ivan Feng <[log in to unmask]<mailto:[log in to unmask]>> 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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