PCB Libraries Forum : SODF OR DFN https://www.PCBLibraries.com/forum/ Thu, 16 Apr 2026 15:42:15 +0000 Wed, 15 Apr 2026 23:49:36 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 30 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3634 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[SODF OR DFN : Dear Tom and Team,Yes, I thought...]]> https://www.PCBLibraries.com/forum/sodf-or-dfn_topic3634_post14510.html#14510 Author: dramos
Subject: 3634
Posted: 15 Apr 2026 at 11:49pm

Dear Tom and Team,

Yes, I thought the same about SODF and DFN.
So I consider that the footprint I created is correct.

In the other hand, it is my question about the shape of the internal corners of the pad.
On our company, when we create a footprint we build it with Nominal density option and Most density option. The program allows to do it in a very fast and easy way.

In both cases, the value Side and Heel is 0.00. It could be similar to the value 0.00 that we have in the Periphery parameter on a DFN.

Furthermore, there are some SODF components where the lead is below the body, for example the mentioned RB751S40T1G.

Yesterday, when I saw the component that I downloaded I started thinking that perhaps it had sense and It could be done using the new features that Altium developed.

I know that it could be a crazy idea, but I would like to start this discussion with you because in PCBFE you have a big and long knowledge. You've been involved in footprints for decades. In my company there is not a dedicated librarian to share with him this kind of ideas.

Anyway, thanks for your comments.
david



]]> Wed, 15 Apr 2026 23:49:36 +0000 https://www.PCBLibraries.com/forum/sodf-or-dfn_topic3634_post14510.html#14510 <![CDATA[SODF OR DFN : This package is definitely a SODFL...]]> https://www.PCBLibraries.com/forum/sodf-or-dfn_topic3634_post14508.html#14508 Author: Tom H
Subject: 3634
Posted: 15 Apr 2026 at 10:47am

This package is definitely a SODFL package. 

A DFN is a BTC package where the terminal lead are completely under the package body. 

DFNs do not have terminal leads that protrude outside the package body. 

SODFL:



DFN:



]]> Wed, 15 Apr 2026 10:47:30 +0000 https://www.PCBLibraries.com/forum/sodf-or-dfn_topic3634_post14508.html#14508 <![CDATA[SODF OR DFN : Hi Tom and Team,I was working...]]> https://www.PCBLibraries.com/forum/sodf-or-dfn_topic3634_post14507.html#14507 Author: dramos
Subject: 3634
Posted: 15 Apr 2026 at 10:23am

Hi Tom and Team,

I was working in this SOD-523 diode, onsemi part number RB751S40T1G .

Suddenly, I had a doubt with a value because the length of the pin is 0.30mm REF, I was thinking to use +/-0.05mm of tolerance but I said to my self: "how PCBFE resolve this question? and I've gone to the Parts area and bingo! it is ready to download.

After downloading I opened it and It was not similar to a SOD-523, it seems more a DFN component. 



Could we consider this kind of components a DFN and why? 

My first impression has been: the footprint is no correct but then... and why not? 
I attached the downloaded file as well.

My component was more "traditional"



I attached as well my component fpx 

Anyway I am not very happy with my footprint and as now we have a new feature where we can modify the corners of a footprint when the pad is rounded rectangle or chamfered pad. 



Using this feature I created the inner corners of the component squared  and outer corners rounded. the inner corners are under the component and perhaps are more close to s DFN...

What's your opinion?



Thanks for your comments, they are always really appreciated.

Regards,
David
]]> Wed, 15 Apr 2026 10:23:33 +0000 https://www.PCBLibraries.com/forum/sodf-or-dfn_topic3634_post14507.html#14507