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QFN Thermal Tab Paste Mask %

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Altium
Forum Description:
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2598
Printed Date: 12 Oct 2024 at 5:25pm


Topic: QFN Thermal Tab Paste Mask %
Posted By: jnbrown
Subject: QFN Thermal Tab Paste Mask %
Date Posted: 15 Jan 2020 at 11:09am
What is a good default value to use for QFN Thermal Tab Paste Mask %?
I asked our contract manufacturer and they me to use the recommendation on the manufacturers data sheet, however most manufacturers do not specify this.


Replies:
Posted By: Tom H
Date Posted: 15 Jan 2020 at 11:20am
Library Expert defaults to 50% paste mask reduction in the "Rules" tab. 

IPC says the range of Paste Mask Reduction should be 40% - 60%. 

Less than 40% is not enough and greater than 60% is too much. 



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