Hi Gary,
I don't have any 'hard copy evidence' but do have an opinion based on
30+ years in the business.
The bare PCB is a part, just like any of the components on the board,
with a rev based on its own history. The assembly is a part itself (in
the product hierarchy) comprised of its pieces (the board ...) with its
own rev. The assembly rev and the board rev are (should be in my
opinion) mutually exclusive of each other.
A rev change to the board may/should affect a rev change to the assembly
while a rev change to the assembly may/should not affect a rev change to
the board.
Mario Irigoyen
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Gary
M. Koven
Sent: Wednesday, February 13, 2008 8:10 AM
To: [log in to unmask]
Subject: [DC] Revision levels of PCB Assy v-v PCB Fab
Thirty-some odd years ago when I was a novice designer, I was trained
that
the revision level of a PCB assembly (PCBA) must match, or be greater
than,
the revision level of the bare PCB fab.
We have a situation now with usable Rev 5 bare board glass that is being
populated for a different application, requiring a new part number for
the
PCBA and the BOM.
I'm inclined to do the initial release of the new PCBA and BOM at Rev 5,
based on experience. My boss wants a Rev 0 release.
I can't remember what document originally specified the form, fit and
function rules for PCB and PCBA revision level control.
Can someone provide hard copy evidence for revision level control to
substantiate, or disprove, what I was taught back in the day?
Thanks and Best Regards,
----------------------------
Gary M. Koven, C.I.D.
Dynazign, Inc.
Charlotte, NC, USA
704.405.1234
Veteran of the Marsh School
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