PCB Libraries Forum : PCB Library Expert PTH Reference Calculator https://www.PCBLibraries.com/forum/ Mon, 20 Apr 2026 22:49:04 +0000 Wed, 03 Jul 2019 07:33:44 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2510 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[PCB Library Expert PTH Reference Calculator : In Library Expert Enterprise,...]]> https://www.PCBLibraries.com/forum/pcb-library-expert-pth-reference-calculator_topic2510_post10337.html#10337 Author: Tom H
Subject: 2510
Posted: 03 Jul 2019 at 7:33am

In Library Expert Enterprise, the through-hole pad stack settings are in - 
Preferences > Terminals > Through-hole > Pad to Hole Ratio & Minimum Annular Ring

In Library Expert Pro, the through-hole pad stack settings are in the Calculator Panel > Terminal tab.

]]> Wed, 03 Jul 2019 07:33:44 +0000 https://www.PCBLibraries.com/forum/pcb-library-expert-pth-reference-calculator_topic2510_post10337.html#10337 <![CDATA[PCB Library Expert PTH Reference Calculator : The PTH Reference calculator and...]]> https://www.PCBLibraries.com/forum/pcb-library-expert-pth-reference-calculator_topic2510_post10336.html#10336 Author: Tom H
Subject: 2510
Posted: 03 Jul 2019 at 7:30am

The PTH Reference calculator and Library Expert Through-hole calculators use what we refer to as incremental pad stack calculation. 

The Hole Size is calculated over the maximum Terminal Lead and the pad stack is 1.5 X the Hole Size. 

A 0.50 mm Hole = 0.75 mm pad size or 0.125 mm annular ring, but the minimum annular ring overrides that. If your minimum annular ring is 0.20 mm then the pad size would be 0.25 mm

A 1.00 mm Hole = 1.50 mm pad size or a 0.25 mm annular ring. 

A 2.00 mm hole = 3.00 mm pad size or a 0.50 mm annular ring. 

Terminal Leads that create large hole sizes probably carry a lot of current or the package is big and bulky and has weight to support. That is the main reason for the larger Annular Ring. To support the package weight and voltage current. Requires additional solder. 

]]> Wed, 03 Jul 2019 07:30:18 +0000 https://www.PCBLibraries.com/forum/pcb-library-expert-pth-reference-calculator_topic2510_post10336.html#10336 <![CDATA[PCB Library Expert PTH Reference Calculator : Is there a version of this that...]]> https://www.PCBLibraries.com/forum/pcb-library-expert-pth-reference-calculator_topic2510_post10334.html#10334 Author: pholden7
Subject: 2510
Posted: 03 Jul 2019 at 5:54am

Is there a version of this that uses "Proportional Padstack" calculations?]]> Wed, 03 Jul 2019 05:54:57 +0000 https://www.PCBLibraries.com/forum/pcb-library-expert-pth-reference-calculator_topic2510_post10334.html#10334