Altium Designer Documentation

Query_Lang-PCBFunctions_Fields_SolderMaskExpansionBottomSolderMaskExpansionBottom_AD

Created: September 10, 2015 | Updated: August 19, 2021
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Parent page: PCB Query Functions - Fields

Summary

The solder mask expansion distance for arcs, fills, pads, regions, tracks, and vias can be determined either by relevant Solder Mask Expansion design rules, or manually, by defining an expansion value as part of the object's properties. For pads and vias, expansion values can be specified independently for both top and bottom sides of the board. This function returns the following:

  • Pads and vias whose Solder Mask Expansion - Bottom property complies with the Query.
  • Arcs, fills, regions, and tracks whose Solder Mask Expansion Mode is set to Manual or From Rule, AND whose Solder Mask Expansion property complies with the Query.

Syntax

SolderMaskExpansionBottom : Number

Number will follow the measurement units currently employed for the document – either Imperial (mil; 1mil = 0.001inch) or Metric (mm; 1mm = 0.001meter).

A specific option for the measurement unit can be specified – overriding the default units specified at the document level – through use of an additional measurement unit-based keyword:

  • AsMils(SolderMaskExpansionBottom) : Number – to specify a solder mask expansion in mil.
  • AsMM(SolderMaskExpansionBottom) : Number – to specify a solder mask expansion in mm.

Example Usage

SolderMaskExpansionBottom = 4
Returns all pad and via objects whose Solder Mask Expansion - Bottom property is 4 current measurement units. Also returns arc, fill, region and track objects whose Solder Mask Expansion Mode is set to Manual or From Rule, and whose Solder Mask Expansion property is 4 current measurement units.

SolderMaskExpansionBottom >= 0.0508
Returns all pad and via objects whose Solder Mask Expansion - Bottom property is greater than or equal to 0.0508 current measurement units. Also returns arc, fill, region and track objects whose Solder Mask Expansion Mode is set to Manual or From Rule, and whose Solder Mask Expansion property is greater than or equal to 0.0508 current measurement units.

AsMils(SolderMaskExpansionBottom) Between 3 And 5
Returns all pad and via objects whose Solder Mask Expansion - Bottom property is greater than or equal to 3mil and less than or equal to 5mil. Also returns arc, fill, region and track objects whose Solder Mask Expansion Mode is set to Manual or From Rule, and whose Solder Mask Expansion property is greater than or equal to 3mil and less than or equal to 5mil.

AsMM(SolderMaskExpansionBottom) < 0.1524
Returns all pad and via objects whose Solder Mask Expansion - Bottom property is less than 0.1524mm. Also returns arc, fill, region and track objects whose Solder Mask Expansion Mode is set to Manual or From Rule, and whose Solder Mask Expansion property is less than 0.1524mm.

Tips

  1. The solder mask expansion distance can be specified to be negative, zero, or positive in value.
  2. The Solder Mask Expansion - Bottom property is only defined for pad and via objects.

 

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