Back in the '70s, I was a contractor (Job Shopper) at Motorola
in Scottsdale, AZ. The PC Boards for each military project used
a different set of "deviations" from the Mil Specs...
Kevin L. Seaman
OrCAD CIS Librarian
Allegro PCB Librarian
Sr. Staff PCB Layout Engineer
Broadcom Corp. Irvine, CA
(949)926-5656 (ext. 65656)
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Ted
Tontis
Sent: Wednesday, November 09, 2005 9:17 AM
To: [log in to unmask]
Subject: Re: [DC] IPC2221, IPC2222
I thought that Mil Specs were being replaced with the IPC Specs?
My take on this is that the Spec is to help designers know what
the industry standard is, and offer them a base line to start off with.
By knowing and understanding the industry standard you can avoid
designing a product that can be more difficult or cost prohibitive to
manufacture.
All designs have different needs and requirements, the trick is
to understand when breaking a design guideline you are sacrificing
something and that something needs to be less costly then the reason you
are breaking that guideline.
Ted
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Steve Mariani
Sent: Wednesday, November 09, 2005 10:44 AM
To: [log in to unmask]
Subject: Re: [DC] IPC2221, IPC2222
What about Class 3 designs? When doing Calss 3 do you use IPC only or
use
Mil Specs too?
----- Original Message -----
From: "Brand, Rodney" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, November 09, 2005 11:37 AM
Subject: Re: [DC] IPC2221, IPC2222
I use standards from our subcontractors. They know what they can do that
does not have a big effect on yield, I lean towards pushing the limits
because today's tighter limits are going to be tomorrows standard
limits. I know that there are absolute limits but we are not there yet.
Remember when 8&8 was common for volume and know 4&4 is common. Most of
the subcontractors have developed their standards by starting with the
IPC's then improving the limits to be competitive.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Mariani, Stephen
Sent: Wednesday, November 09, 2005 10:57 AM
To: [log in to unmask]
Subject: [DC] IPC2221, IPC2222
All,
I would like to get an idea on how may of you design PCB's using IPC
manuals or a company design standards driven from mfg or both? Does
anyone only use IPC standards to create designs?
Thanks
Steve
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