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Include Via in Thermal Pad Footprint

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=2990
Printed Date: 25 Nov 2024 at 3:44pm


Topic: Include Via in Thermal Pad Footprint
Posted By: gvellet
Subject: Include Via in Thermal Pad Footprint
Date Posted: 01 Oct 2021 at 9:13am
Hi,

In a QFN footprint with a thermal pad in the center. Is there a reason why we should not include the n vias in the thermal pad already in the footprint? 

If I am not mistaken, the standard practice is that the PCB designer shall instantiate the footprint on his PCB. 

Then while doing the layout he adds manually the vias in the thermal pad of each QFN package. 

It seems to me like error prone and a waste of time.

Thank you,


Replies:
Posted By: Tom H
Date Posted: 01 Oct 2021 at 9:54am
Most CAD tools cannot handle vias in Thermal Pad without a pin name. 

Most CAD tools cannot move or delete vias built into a PCB library part once it's in the PCB design. 

We created an entire library where every Thermal Pad had vias and put it out to our customers. Lots of complaints came in, so we removed them. 

You can add vias to the Thermal Pad in FP Designer if you like.



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