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Circular Connector Origin
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AGONZ67 View Drop Down
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    Posted: 6 hours 12 minutes ago at 8:09am
What is the standard for circular connector origins? 

Is there an IPC spec that specifically states pin one or centroid of body?
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Tom H View Drop Down
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Points: 5973 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 5 hours 58 minutes ago at 8:23am
Normally, the footprint origin is the Center of Gravity. 

However, some designers put the origin on Pin 1. We did this in the 1980s and 90s to keep all the pad locations on a 0.10" grid to make routing traces easier. 

But then the metric system came along and gridless routing. 
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Points: 122 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AGONZ67 Quote  Post ReplyReply Direct Link To This Post Posted: 5 hours 45 minutes ago at 8:36am
Does IPC specifically state a location? 

I don't have the spec handy, but a search produces the following results. "According to the According to the IPC-7351 standard, the origin for a circular connector's land pattern should be at the centroid (center) of the part's body." 

We are about to have this discussion and would like to know if there are established IPC specs stating something to the effect of, "origin of through hole circular connectors shall be 'pin one', or 'centroid' ?
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Points: 5973 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 39 minutes ago at 9:42am
I've never heard of IPC providing any guidance on land pattern origin or drafting outlines for silkscreen (IPC says no silkscreen is preferred), assembly, component, terminal, origin target. 

IPC left this up to the PCB designer preference. 

However, most assembly pick & place machines use the center of gravity for the origin. 

If a PCB designer places the origin for the 14-pin DIP footprint, then the assembly shop must take the time to calculate the center for their pick and place line. This is very time consuming.

You should discuss footprint origins with your assembly shop. You provide the X,Y coordinate list for all the footprints in your PCB layout. What does assembly prefer?
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Hi AGONZ67,
We are using in the next way, the center of the component is the copper center.
In the courtyard mechanical layer we place another center mark that is the center of the rectangle of the courtyard.
Waiting your comments, this is an interesting discussion.
Regards
david
PS: the attached pic are related to 2137160001 Molex connector
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