Paste Mask Rules For Thermal Pads
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=2452
Printed Date: 25 Nov 2024 at 11:53am
Topic: Paste Mask Rules For Thermal Pads
Posted By: manu
Subject: Paste Mask Rules For Thermal Pads
Date Posted: 20 Mar 2019 at 4:16am
|
Hello, What are the exact rules for the thermal pad solder mask ? I know that it is 50% of the pad but from what size the mask is divided by 4 or more rectangles ? And what is the rule for the distance between these small rectangles? and the distance between these rectangles and the edge of the copper pad ? Thanks in advance.
|
Replies:
Posted By: Tom H
Date Posted: 20 Mar 2019 at 8:36am
The Thermal Tab Rules are located in the "Preferences > Rules" section of Library Expert.
You define the Thermal Tab values that are best for you to create a custom library that matches your preferences. Solder Mask Defined Thermal Pads are a new IPC-7093A standard. See this forum post - https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154.html " rel="nofollow - https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154.html ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Tom H
Date Posted: 27 Dec 2019 at 4:19pm
Here is an image of the Minimum paste mask aperture spacing rules for a SON package with a Thermal Pad that intersects with a row of pins.  ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |