PCB Libraries Forum : DFN and PSON footprint differences https://www.PCBLibraries.com/forum/ Fri, 03 Apr 2026 21:22:43 +0000 Wed, 18 Jun 2025 14:59:16 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3495 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[DFN and PSON footprint differences : Hi,It was not a Feature Request...]]> https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13899.html#13899 Author: dramos
Subject: 3495
Posted: 18 Jun 2025 at 2:59pm

Hi,
It was not a Feature Request at the beginning of all...

But as I realized that the Option configuration could create confusion between the users, YES I will add it as Request improvement of the program.

Best regards,
david
]]> Wed, 18 Jun 2025 14:59:16 +0000 https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13899.html#13899 <![CDATA[DFN and PSON footprint differences : Is this a New Feature Request?If...]]> https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13898.html#13898 Author: Tom H
Subject: 3495
Posted: 18 Jun 2025 at 9:01am

Is this a New Feature Request? 

If so, you're in the wrong Forum Thread. Go here - 
https://www.pcblibraries.com/forum/product-suggestions_forum33.html

The component families are grouped together for easy code changes. 

]]> Wed, 18 Jun 2025 09:01:20 +0000 https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13898.html#13898 <![CDATA[DFN and PSON footprint differences : Hi,Many thanks for the explanation!I...]]> https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13897.html#13897 Author: dramos
Subject: 3495
Posted: 17 Jun 2025 at 10:33pm

Hi,

Many thanks for the explanation! 

I am working on the Calculator Option File, and I would like to share with you one idea.
When we are configuring the default Pin1 orientation, Pad shape... In the Components-Surface Mount , Would be very crazy - no sense idea - to separate into two different options the QFN and PQFN. SON and PSON is another example.

The reason is the next, if we have a PQFN component with rectangular leads of course we will use a rectangular pad, but if we have a QFN footprint with a rectangular lead perhaps would be interesting to use a rounded rectangle pad.
uploads/15739/example1_2025-06-17_22-32-35.png

Thanks for your comments.

Best regards,
david

]]> Tue, 17 Jun 2025 22:33:24 +0000 https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13897.html#13897 <![CDATA[DFN and PSON footprint differences : PSON is the same as PQFN as both...]]> https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13896.html#13896 Author: Tom H
Subject: 3495
Posted: 17 Jun 2025 at 7:13am

PSON is the same as PQFN as both have Pull-Back leads under the package body. 

PSON/PQFN terminal leads come is 2 shapes. 
  1. Rectangular Lead = Rectangular Pad
  2. D-Shaped Lead = Rounded Rectangle Pad
LGAs have 2 terminal lead shapes. 
  1. Square Lead - Square Pad
  2. Round Lead = Round Pad
DFNs have rectangular leads

Thermal Terminal Leads come in 2 shapes.
  1. Rectangular 
  2. Rounded Rectangular 

]]> Tue, 17 Jun 2025 07:13:59 +0000 https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13896.html#13896 <![CDATA[DFN and PSON footprint differences : Hi Tom and Team,When I am creating...]]> https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13895.html#13895 Author: dramos
Subject: 3495
Posted: 16 Jun 2025 at 11:10pm

Hi Tom and Team,

When I am creating footprints I have as a rule of thumb, to use rounded rectangle pads except for DFN, LGA, PQFN and Thermal pads. For this footprints I use rectangle pads

What about PSON? I think that this footprint has the pads underneath the body as a DFN and It should use a rectangle pad, as well.

What is the default recommendation for this footprint type?

Regards,
david
]]> Mon, 16 Jun 2025 23:10:49 +0000 https://www.PCBLibraries.com/forum/dfn-and-pson-footprint-differences_topic3495_post13895.html#13895