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Dimensions for Terminal and Component Outlines

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Footprints / Land Patterns
Forum Description: [General or a CAD specific issues / discussions]
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2508
Printed Date: 25 Nov 2024 at 2:40am


Topic: Dimensions for Terminal and Component Outlines
Posted By: Batiskaff
Subject: Dimensions for Terminal and Component Outlines
Date Posted: 02 Jul 2019 at 2:07pm
Which are package dimensions are preferred to use to draw the component and terminal outlines (nominal or maximal body dimensions)? 

Are the rules similar for SMD and PTH or not?


Replies:
Posted By: Tom H
Date Posted: 02 Jul 2019 at 2:11pm
Nominal dimensions are used for the Package Body outline and the Terminal Lead outlines and in the land pattern naming convention and the default 3D STEP model (except for Package Height). 

Rules are the same across all component families. 


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Posted By: Batiskaff
Date Posted: 02 Jul 2019 at 2:17pm
Thank you for help.

Posted By: Batiskaff
Date Posted: 03 Jul 2019 at 12:09am
I just noticed that Library Expert calculator uses maximum values of body dimensions for terminal and body outlines in all Through Hole families except Crystal(HC49). In SMD families used nominal values.

Posted By: Batiskaff
Date Posted: 03 Jul 2019 at 9:06am 
Was this done for some reason in calculator?

Posted By: Tom H
Date Posted: 08 Jul 2019 at 12:56pm
I looked at the through-hole calculators and most of the component families only require "Maximum Dimensions". This includes, Axial, DIP, SIP, Header, etc. 

Because the through-hole calculators only require Maximum dimensions, that's the only thing we have to go by. 

This is the reason why the Maximum Body value is used on the Component Body Outline. 



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