PCB Libraries Forum : Footprint Expert Physical Description https://www.PCBLibraries.com/forum/ Tue, 07 Apr 2026 01:51:01 +0000 Sun, 14 Sep 2025 08:47:33 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3538 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Footprint Expert Physical Description : The footprint name describes the...]]> https://www.PCBLibraries.com/forum/footprint-expert-physical-description_topic3538_post14026.html#14026 Author: Tom H
Subject: 3538
Posted: 14 Sep 2025 at 8:47am

The footprint name describes the outer dimensions of the package. 

The 16.00 mm = the Lead Span per the IPC-7351 Naming Convention Guidelines. 

The 14.00 mm = the Physical Description of the Package Body (doesn't include the terminal leads, just the package body dimensions). 

]]> Sun, 14 Sep 2025 08:47:33 +0000 https://www.PCBLibraries.com/forum/footprint-expert-physical-description_topic3538_post14026.html#14026 <![CDATA[Footprint Expert Physical Description : I have noticed that as screen...]]> https://www.PCBLibraries.com/forum/footprint-expert-physical-description_topic3538_post14020.html#14020 Author: m.elsayed
Subject: 3538
Posted: 14 Sep 2025 at 12:29am

I have noticed that as screen shows Footprint Name uses the D1 dimension instead of D. 

Please can add more details, also how is the Physical Description generated? 

Footprint Name: QFP50P1600X1600X120-100

Physical Description:
Quad Flat Pack (QFP), 0.50 mm pitch; 100 pin, square, 25 pin X 25 pin, 14.00 mm L X 14.00 mm W X 1.20 mm H body


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