PCB Libraries Forum : IPC-7351 Mounting Hole Naming Convention & Info

IPC-7351 Mounting Hole Naming Convention & Info : The Footprint Naming Convention...

Thu, 26 Mar 2015 12:54:01 +0000

Author: Nick B
Subject: 619
Posted: 26 Mar 2015 at 12:54pm

The Footprint Naming Convention has been updated.

IPC-7351 Mounting Hole Naming Convention & Info : Hi Tom, Many thanks for the...

Tue, 15 Oct 2013 18:50:57 +0000

Author: ctm81
Subject: 619
Posted: 15 Oct 2013 at 6:50pm

Hi Tom,

Many thanks for the additional info and it is much appreciated.

Thanks

CTM

IPC-7351 Mounting Hole Naming Convention & Info : IPC-7351C and IPC-7251 for Through-hole...

Tue, 15 Oct 2013 06:48:33 +0000

Author: Tom H
Subject: 619
Posted: 15 Oct 2013 at 6:48am

IPC-7351C and IPC-7251 for Through-hole are supposed to be sister documents and will be sold together.

The hold up right now is that IPC is creating a new standard IPC-7070 for Assembly Attachment and all the PCB manufacturing data that is in 7251 and 7351 is transferring over to the new 7070 standard (which I am the co-chair on the 7070 committee as well as being a member of the 7251 & 7351 executive committee).

The original scheduled release date for all 3 standards was at IPC APEX in March 2014.

But you can always contact IPC and inquire with them. It would be good for everyone to contact IPC and ask them directly when these standards are going to be released. I will try to contact them today and get the status for you.

IPC-7351 Mounting Hole Naming Convention & Info : Hi folks,I went thru the IPC...

Tue, 15 Oct 2013 02:13:01 +0000

Author: ctm81
Subject: 619
Posted: 15 Oct 2013 at 2:13am

Hi folks,

I went thru the IPC list of standards at the link below but it seems the IPC-7251 has yet to be released.

http://www.ipc.org/4.0_Knowledge/4.1_Standards/revstat1.htm

Any estimated date where this new standard will be released?

Thanks

CTM

IPC-7351 Mounting Hole Naming Convention & Info : Good idea on the "A"...

Wed, 06 Mar 2013 08:28:37 +0000

Author: Tom H
Subject: 619
Posted: 06 Mar 2013 at 8:28am

Good idea on the "A" for annulus (for now).

If "o" is listed as an offset modifier then it got past the committee as the only viable option for "Offset".

IPC-7351 Mounting Hole Naming Convention & Info : I've gone with a for annulus...

Wed, 06 Mar 2013 08:24:50 +0000

Author: jameshead
Subject: 619
Posted: 06 Mar 2013 at 8:24am

I've gone with a for annulus for now.

a500_250h200 = annulus outside diam. 5 mm, inside diam. 2.5 mm, hole diam. 2 mm.

Since it's a fundamental pad type in Pulsonix and Gerber I think it deserves its own unique basic land shape identifier and not a modifier.

o was listed as the offset modifier - has this been removed?

IPC-7351 Mounting Hole Naming Convention & Info : You're right, we did not...

Wed, 06 Mar 2013 08:08:56 +0000

Author: Tom H
Subject: 619
Posted: 06 Mar 2013 at 8:08am

You're right, we did not think to add this pad shape.

My recommendation to IPC would be to include the Pad Shape "C" followed by O + Value & I + Value.

co500i250h200 = Circular Pad Outside diameter 5.00 mm Inside diameter 2.50 mm Hole size 2.00 mm

However, IPC has banned "o" and "i" as illegal characters (so they are not used anywhere else).

O looks too close to a "0" and I looks too close to a "1" but not if you use lower case characters.

IPC-7351 Mounting Hole Naming Convention & Info : Hi Tom,How does an annulus or...

Wed, 06 Mar 2013 04:06:02 +0000

Author: jameshead
Subject: 619
Posted: 06 Mar 2013 at 4:06am

Hi Tom,

How does an annulus or donut fit into the IPC-7x51 padstack naming convention?

I couldn't find any modifiers that seemed to fit sensibly for a "c" pad style name to indicate an annulus since the "y" is for plane antipads.

James

IPC-7351 Mounting Hole Naming Convention & Info : I got the updated IPC-2221B and...

Fri, 15 Feb 2013 08:15:17 +0000

Author: Tom H
Subject: 619
Posted: 15 Feb 2013 at 8:15am

I got the updated IPC-2221B and it does not have any Mounting Hole guidance. So I wrote the chair committee person (Gary Ferrari) and he told me that the information I was looking for was in the new IPC-2222A Paragraph 9.1.3 and associated picture.

I'll get the updated IPC-2222A today and check it out.

But the best advice is to talk to your fabrication shop.

IPC-7351 Mounting Hole Naming Convention & Info : In addition to Tom's two...

Thu, 14 Feb 2013 02:19:02 +0000

Author: jameshead
Subject: 619
Posted: 14 Feb 2013 at 2:19am

In addition to Tom's two points:

A non-plated hole can have copper around it but it affects the fabrication of the board.

If a non-plated hole is clear of copper then it can be drilled at the first stage drilling along with all the plated holes and is then "tented" by the film to prevent it being plated.

If you have a non-plated hole with the drill going through copper then as well as the points Tom mentions, the drill will have to be drilled at the second stage drilling along with the route.