Altium Designer Documentation

Working with the Vias Under SMD Design Rule on a PCB in Altium Designer

Created: February 23, 2016 | Updated: September 27, 2019
Now reading version 16.0. For the latest, read: High Speed - Vias Under SMD for version 21
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Rule Category: High Speed

Rule Classification: Unary


This rule specifies whether vias can be placed under SMD pads.


Default constraints for the Vias Under SMD rule.

  • Allow Vias under SMD Pads - specifies whether vias can be placed under the pads of surface mount components. (Default = disabled).

How Duplicate Rule Contentions are Resolved

All rules are resolved by the priority setting. The system goes through the rules from highest to lowest priority and picks the first one whose scope expression matches the object(s) being checked.

Rule Application

Online DRC, Batch DRC, and during interactive routing and autorouting.

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