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

Created: March 17, 2022 | Updated: March 18, 2022 | Applies to version: 4

This document is no longer available beyond version 4. Information can now be found here: SMD Neck-Down Rule for version 5

This documentation page references Altium NEXUS/NEXUS Client (part of the deployed NEXUS solution), which has been discontinued. All your PCB design, data management and collaboration needs can now be delivered by Altium Designer and a connected Altium 365 Workspace. Check out the FAQs page for more information.

 

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.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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