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Mounting Holes: Satellite Vias Standard?

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=3328
Printed Date: 25 Jan 2025 at 1:04pm


Topic: Mounting Holes: Satellite Vias Standard?
Posted By: teamcomtac
Subject: Mounting Holes: Satellite Vias Standard?
Date Posted: 16 Oct 2023 at 3:03am
Hello,

Are there any standards / guidelines on Satellite Vias of Mounting holes? 

The hole size is given by the screw diameter and the pad size is given by the screw's head / washer but what about satellite vias?

- At which distance from the center should the vias be placed? Under the head? Outside of the head?
- What should the diameter of the vias be? Is it proportional to the hole's dimension?

Thanks in advance!


Replies:
Posted By: Tom H
Date Posted: 16 Oct 2023 at 8:21am
Satellite vias are usually used for mounting holes that need extra support for mounting hardware. 

When using torque to screw to a nut with washer you might need the extra support to prevent crushing the FR4 glass. 

Without this support of satellite vias, you might crush the FR4 glass with too much torque. 

Also, because screws going to mounting holes might need to be grounded, the satellite vias provide extra grounding support. 



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