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SMD vs. PTH Outline and Footprint Name

Printed From: PCB Libraries Forum
Category: General
Forum Name: General Discussion
Forum Description: general topics not related to other forums
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2976
Printed Date: 31 Oct 2025 at 7:44am


Topic: SMD vs. PTH Outline and Footprint Name
Posted By: stanleycayochok
Subject: SMD vs. PTH Outline and Footprint Name
Date Posted: 31 Aug 2021 at 8:27pm
Is there a reason why PTH use maximum dimension while SMD uses nominal dimension for outline mapping and footprint naming?

Would it be possible to add an option for PTH to use nominal instead of maximum?


Replies:
Posted By: Jeff.M
Date Posted: 01 Sep 2021 at 9:15am
It's because at the time we created the calculator, most manufacturers only provided Maximum body dimensions for most Through-hole component packages. 

A spot check of data sheets shows this is still the case.

There's also the practical reason to provide a more realistic and consistent graphic representation of the terminal relationships to the body for SMD parts because of tighter sizes and tolerances.



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