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

Created: März 17, 2022 | Updated: März 18, 2022 | Applies to version: 21

This document is no longer available beyond version 21. Information can now be found here: SMD Neck-Down Rule for version 25

 

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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Note

The features available depend on your Altium product access level. Compare features included in the various levels of Altium Designer Software Subscription and functionality delivered through applications provided by the Altium 365 platform.

If you don’t see a discussed feature in your software, contact Altium Sales to find out more.

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