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IPC-7351 Mounting Hole Naming Convention & Info

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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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.
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jameshead Quote  Post ReplyReply Direct Link To This Post 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
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jameshead Quote  Post ReplyReply Direct Link To This Post 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?
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Tom H View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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".
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ctm81 Quote  Post ReplyReply Direct Link To This Post 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.
 
Any estimated date where this new standard will be released?
 
Thanks
CTM
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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.
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ctm81 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2013 at 6:50pm
Hi Tom,
 
Many thanks for the additional info and it is much appreciated.
 
Thanks
CTM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick B Quote  Post ReplyReply Direct Link To This Post Posted: 26 Mar 2015 at 12:54pm
The Footprint Naming Convention has been updated.
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