PCB Libraries Forum : Class A (Most) Land Pattern Extended Pads https://www.PCBLibraries.com/forum/ Tue, 14 Apr 2026 22:38:02 +0000 Tue, 11 Jun 2024 08:30:36 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3391 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Class A (Most) Land Pattern Extended Pads : You can&#039;t manually solder...]]> https://www.PCBLibraries.com/forum/class-a-most-land-pattern-extended-pads_topic3391_post13553.html#13553 Author: Tom H
Subject: 3391
Posted: 11 Jun 2024 at 8:30am

You can't manually solder BTC or Grid Array parts, and Gullwing parts don't require a lot of solder on the Toe. 

However, 80% of the parts on a typical PCB layout are Chips. Here is the IPC J-STD-001 guidelines for Chip packages. The main focus is the "F" dimension or the Toe solder joint goal.


]]> Tue, 11 Jun 2024 08:30:36 +0000 https://www.PCBLibraries.com/forum/class-a-most-land-pattern-extended-pads_topic3391_post13553.html#13553 <![CDATA[Class A (Most) Land Pattern Extended Pads : Hey everyone,My understanding...]]> https://www.PCBLibraries.com/forum/class-a-most-land-pattern-extended-pads_topic3391_post13552.html#13552 Author: Alex Quilty
Subject: 3391
Posted: 11 Jun 2024 at 7:28am

Hey everyone,

My understanding for IPC's Class A Land Patterns is that they perform just as well as Class B (Nominal) Land Patterns. I also know that the Class A Land Patterns have been kept for those who may be soldering the component to the PCB by hand. Finally, where I am a little confused, is where a particular Pad may be too small or too big, this could cause issues in manufacturing to IPC Class specifications depending on the size, which leads me to the question: 

Is it okay to extend my Pads to allow for easier hand soldering? If so, how much longer am I allowed to make these Pads before it degrades the Fillet too much, since the solder would be spreading along the Pad instead of climbing the lead to form the Filet?

Edit: I just noticed the Land Pattern Forum section, I can move this there if you would like, otherwise I will leave it here, or if a MOD could move this post, that would be awesome! Let me know if you want me to move it.
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