PCB Libraries Forum : Component zero Orientation A or B?

PCB Libraries Forum : Component zero Orientation A or B? https://www.PCBLibraries.com/forum/ Mon, 06 Apr 2026 09:21:43 +0000 Mon, 30 Mar 2020 11:46:59 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2389 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Component zero Orientation A or B? : We're building a lot of 4-pin...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10697.html#10697 Author: Tom H
Subject: 2389
Posted: 30 Mar 2020 at 11:46am

We're building a lot of 4-pin DFN footprints for PCBPOD, and Pin 1 is all over the place.

Pin 1 in lower left, upper left, upper right, lower right.

There is no standard pin out for the 4-pin DFN package and therefore there is no standard Pin 1 Zero Orientation. Never will be. The component manufacturer's are doing whatever they want.

]]> Mon, 30 Mar 2020 11:46:59 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10697.html#10697 <![CDATA[Component zero Orientation A or B? : Right now we're getting ready...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10653.html#10653 Author: Tom H
Subject: 2389
Posted: 27 Feb 2020 at 2:18pm

Right now we're getting ready to release our V2020 Library Expert Beta in 2 weeks.

The programmers are not going to update anything until after the official release in mid-April.

The main reason is that V2020 is a total rewrite that started a year ago and nothing is going to distract them from meeting release deadlines.

This is not an easy fix and may take a week, but the most important thing is 100,000 users with existing libraries created by Library Expert do not like changes. Even though you can control the Zero Orientation in Preferences.

]]> Thu, 27 Feb 2020 14:18:04 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10653.html#10653 <![CDATA[Component zero Orientation A or B? : Hi Tom,Thanks for the info. Since...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10652.html#10652 Author: ransonjd
Subject: 2389
Posted: 27 Feb 2020 at 1:48pm

Hi Tom,

Thanks for the info. Since there's no DFN specific reason to favor the current orientation, could the orientation be updated to match the orientation of similar 3&4-pin components? I feel like one of the major benefits of PCB libraries is the consistency of the footprints generated, and DFNs seem like an odd exception.

]]> Thu, 27 Feb 2020 13:48:07 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10652.html#10652 <![CDATA[Component zero Orientation A or B? : I forgot to mention the main reason.Unlike...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10651.html#10651 Author: Tom H
Subject: 2389
Posted: 27 Feb 2020 at 1:17pm

I forgot to mention the main reason.

Unlike most component families, the 4-pin DFN has multiple pin configurations and Pin 1 can be in different locations.

So there really is no Zero Orientation for the 4-pin DFN.

]]> Thu, 27 Feb 2020 13:17:38 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10651.html#10651 <![CDATA[Component zero Orientation A or B? : It's because the "D"...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10650.html#10650 Author: Tom H
Subject: 2389
Posted: 27 Feb 2020 at 1:15pm

It's because the "D" dimension is normally larger than the "E" dimension.

Our software programmer didn't read our documentation. Confused

Not sure if IPC-7351C will ever adopt the Orientation B concept to align with the IEC 61188-7 Standard which lists both A & B orientations.

I'm not sure if IPC-7351C will ever be released. The chairman Karen McConnell just stepped down after 20 years and the subcommittee is losing interest.

]]> Thu, 27 Feb 2020 13:15:20 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10650.html#10650 <![CDATA[Component zero Orientation A or B? : Hi,I'm noting that 4-pin...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10648.html#10648 Author: ransonjd
Subject: 2389
Posted: 27 Feb 2020 at 1:00pm

Hi,

I'm noting that 4-pin DFNs still follow "A" orientation and not "B" orientation. What's the motivation for this difference from other 4-pin components?

Thanks!

]]> Thu, 27 Feb 2020 13:00:04 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post10648.html#10648 <![CDATA[Component zero Orientation A or B? : Thanx Tom!I can help you by telling...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9801.html#9801 Author: AB_Regin
Subject: 2389
Posted: 04 Oct 2018 at 10:37pm

Thanx Tom!

I can help you by telling that I discovered this issue after POD download of this one:

http://www.pcblibraries.com/POD/?M=KINGBRIGHT&PN=APHF1608SEEQBDZGKC

]]> Thu, 04 Oct 2018 22:37:37 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9801.html#9801 <![CDATA[Component zero Orientation A or B? : I see now what you are referring...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9800.html#9800 Author: Tom H
Subject: 2389
Posted: 04 Oct 2018 at 8:23am

I see now what you are referring to.

I created the documentation, so now I have to find some 4-pin DFN parts and see what the typical pin numbering scheme is for Antenna, Capacitor, Crystal, Diode, Filter, Inductor, IC, Oscillator (the most used family for this package), Resistor & Transistor.

Thank you for reporting this issue.

]]> Thu, 04 Oct 2018 08:23:29 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9800.html#9800 <![CDATA[Component zero Orientation A or B? : And more...I found this document,...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9798.html#9798 Author: AB_Regin
Subject: 2389
Posted: 04 Oct 2018 at 1:17am

And more...

I found this document, in which the DFN-4 is described as an oscillator (this is just a matter of a different 3D Body i guess):

https://www.pcblibraries.com/Products/FPX/UserGuide/download/Library%20Expert%20Surface%20Mount%20Families.pdf

Here in this document it shows the correct rotation for level B, but your library expert outputs it as level A!

]]> Thu, 04 Oct 2018 01:17:16 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9798.html#9798 <![CDATA[Component zero Orientation A or B? : I can add some more information...]]> https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9797.html#9797 Author: AB_Regin
Subject: 2389
Posted: 04 Oct 2018 at 12:58am

I can add some more information after some searching..

I found this old topic:

https://www.pcblibraries.com/forum/ipc7351c_topic732.html

At that time you Tom said that the Library Expert follows the IPC 7315C and Level B zero rotation, but that does not seem to be the case with the DFN-4?

]]> Thu, 04 Oct 2018 00:58:09 +0000 https://www.PCBLibraries.com/forum/component-zero-orientation-a-or-b_topic2389_post9797.html#9797