Hi Dave,
You are equating 'Functional Performance' Classes with reliability classes--they are not the same. I have tried, in the past nut unsuccessfully, to put a disclaimer into the scope of these documents, to alert the reader that only an appropriate 'Design-for-Reliability' would assure reliability.
While good quality is a requirement for reliability, it is far from sufficient. That is why we have IPC-D-279 and all the IPC-970x's. Neither IPC-6012 nor IPC-6013 were written with reliability being in any way addressed. There is at least one documented situation, where Class 3 product fails before Class 2 product.
If I can get Class 3 without cost penalty, sure, why not, but do I have to have it for reliable product---NO. In most cases, Class 3 is specified for contractual, not technical reasons, and because there is a more complete paper trail [which is not a bad thing].
Werner
-----Original Message-----
From: David Bergman <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 8 Apr 2009 2:16 pm
Subject: [TN] Decoupling Performance Class and Quality Assurance testing?
Along with John Perry, I just made a post to IPC’s blog site about quality
assurance testing to IPC board standards. The first paragraph is below. I
would be very interested in some discussion on this topic on the blog site.
Here is the link:
http://blog.ipc.org/
How much do you know about IPC’s PCB performance documents IPC-6012 or IPC-6013
Class 3 requirements? Sure, everybod
y wants Class 3, and why not? The
performance classification carries with it the highest level of end product
reliability, but does everybody need it? Class 3 was developed for end products
where down time means human life is endangered (life support equipment, critical
weapon systems, etc.). Is Class 3 appropriate for everyone (IPC, for example,
is aware of some military end products that are built to Class 2 requirements)?
Even though Class 2 would yield acceptable product in many cases, some customers
want the end product built to Class 3, end of discussion……………
Best regards,
Dave
David W. Bergman 大山人
Vice President, International Relations
IPC - Association Connecting Electronics Industries
3000 Lakeside Drive Suite 309 S Bannockburn, IL 60015-1249 USA
+1 847-597-2840 tel
+1 847-615-5640 fax
+1 847-867-1388 mobile
[log in to unmask]
www.ipc.org
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