Working with the SMD Neck-Down Design Rule on a PCB in Altium Designer
Created: February 22, 2016 | Updated: April 11, 2017
| Applies to versions: 16.0, 16.1, 17.0 and 17.1
Now reading version 16.1. For the latest, read: Working with the SMD Neck-Down Design Rule on a PCB in Altium Designer for version 21
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.
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.