Working with the SMD Neck-Down Design Rule on a PCB in Altium NEXUS

Created: March 18, 2022 | Updated: March 18, 2022

This document is no longer available beyond version 21. Information can now be found here: SMD Neck-Down Rule for version 5

Contents

Summary
Constraints
How Duplicate Rule Contentions are Resolved
Rule Application

All Contents

Rule category: SMT

Rule classification: Unary

Summary

This rule specifies the maximum ratio of the track width to the SMD pad width, expressed as a percentage.

All design rules are created and managed within the PCB Rules and Constraints Editor dialog. For a high-level view of working with the design rules system, see Defining, Scoping & Managing PCB Design Rules.

Constraints

Default constraints for the SMD Neck-Down rule.

Neck-Down - the percentage value for the maximum permissible ratio of track width to SMD pad width. Entering a larger value will allow for the use of greater width track.

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 and Batch DRC.

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