PCB Libraries Forum : Circular Connector Origin

PCB Libraries Forum : Circular Connector Origin https://www.PCBLibraries.com/forum/ Mon, 13 Apr 2026 09:16:12 +0000 Mon, 24 Nov 2025 13:55:43 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3580 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Circular Connector Origin : Hi AGONZ67,We are using in the...]]> https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14341.html#14341 Author: dramos
Subject: 3580
Posted: 24 Nov 2025 at 1:55pm

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

uploads/15739/con1.png

uploads/15739/con2.png

]]> Mon, 24 Nov 2025 13:55:43 +0000 https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14341.html#14341 <![CDATA[Circular Connector Origin : I've never heard of IPC providing...]]> https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14340.html#14340 Author: Tom H
Subject: 3580
Posted: 24 Nov 2025 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?

]]> Mon, 24 Nov 2025 09:42:56 +0000 https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14340.html#14340 <![CDATA[Circular Connector Origin : Does IPC specifically state a...]]> https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14339.html#14339 Author: AGONZ67
Subject: 3580
Posted: 24 Nov 2025 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, theorigin 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' ?

]]> Mon, 24 Nov 2025 08:36:39 +0000 https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14339.html#14339 <![CDATA[Circular Connector Origin : Normally, the footprint origin...]]> https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14338.html#14338 Author: Tom H
Subject: 3580
Posted: 24 Nov 2025 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.

]]> Mon, 24 Nov 2025 08:23:07 +0000 https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14338.html#14338 <![CDATA[Circular Connector Origin : What is the standard for circular...]]> https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14337.html#14337 Author: AGONZ67
Subject: 3580
Posted: 24 Nov 2025 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?

]]> Mon, 24 Nov 2025 08:09:18 +0000 https://www.PCBLibraries.com/forum/circular-connector-origin_topic3580_post14337.html#14337