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Solder Mask on Power Pads

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3329
Printed Date: 12 Oct 2024 at 7:27pm


Topic: Solder Mask on Power Pads
Posted By: tomasc
Subject: Solder Mask on Power Pads
Date Posted: 16 Oct 2023 at 6:15am
Hello,

When generating footprints with power pads (For example QFN, PQFN etc.) and importing them into Altium Designer, these pads are covered with Solder Mask. 

It looks like the "Top Paste" layer is made into "Top Solder" which means there is solder mask on a solderable pad.

Which settings I should change to make a power pad into a one "Top Solder" layer?


Replies:
Posted By: Tom H
Date Posted: 16 Oct 2023 at 8:48am
Solder Mask is a Negative image. 

The Thermal Pads are no covered in Solder Mask, the solder mask is completely removed from all pads. 

Paste Mask is a Positive image and Solder Mask is a Negative image. 

You're mixing you layer assignments up. 

Top Solder layer = Solder Mask
Top Paste layer = Paste Mask

We never had a problem with this in the past 20 years. 

Maybe I'm missing something that needs more explanation. If so, please elaborate. 

Thanks



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