Footprint Expert Physical Description

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   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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m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Expert User Joined: 22 Sep 2016 Status: Offline Points: 205	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Topic: Footprint Expert Physical Description 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



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5940	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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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