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Footprint Expert Physical Description

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3538
Printed Date: 30 Oct 2025 at 7:06pm


Topic: Footprint Expert Physical Description
Posted By: m.elsayed
Subject: Footprint Expert Physical Description
Date 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


Replies:
Posted By: Tom H
Date 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). 



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