Teardrops

Parent page:  PCB Dialogs

The Teardrops dialog is used to add and remove teardrops from the design.

Summary

Teardrops are often added to a routed PCB design to create stronger track-to-pad, track-to-via and track-to-track connections. This is valuable when the the design objects are very small, and is particularly valuable for drilled pads and vias, because mis-alignment between the drill center and the pad/via center can result in the drill hole removing much of the copper connecting the track to the pad/via. 

Teardrops are created by placing a region object at the required location.

Access

To add or remove teardrops to the current PCB, select Tools » Teardrops from the menus.

Options/Controls

Teardrops can be added and their properties defined as follows:

• Working Mode - Add or Remove teardrops, in accordance with the other dialog settings.
• Objects - target either all objects (All), or only those objects currently selected in the workspace (Selected only). This setting is used in conjunction with those object types enabled in the Scope region of the dialog.
• Teardrop style - the edge of the region object used to create the teardrop can be straight (Line) or Curved.
• Force teardrops - if this option is enabled, teardrops will be applied to all vias and/or SMD pads, even if this results in a DRC violation.
• Adjust teardrop size - if this option is enabled the teardrop size is automatically reduced to meet applicable design rules.
• Generate report - create a text report listing both successful and unsuccessful teardrop sites.
• Scope - enable which objects to consider for teardrop addition/removal - Vias, SMD Pads, Tracks, T-Junctions- in conjunction with the coarse-level scoping defined in the Objects region of the dialog. When adding teardrops, you can configure teardrop sizing as follows:
  • Via (and round Thru-Hole Pads) - specify the length and width of the teardrop as percentages of the via/thru-hole pad diameter (d). The defaults are 30% and 70% respectively. Click the blue percentage values to change these as required.
  • SMD Pad (and non-round Thru-Hole Pads) - specify the length and width of the teardrop as percentages of the attached track width (w). The defaults are 100% and 200% respectively. Click the blue percentage values to change these as required.
  • Tracks - specify the length of the teardrop as a percentage of the attached track width (w). The default is 100%. Click the blue percentage value to change this as required.
  • T-Junction - specify the length and width of the teardrop as percentages of the primary track width (w) (the horizontal track in the image). The defaults are 300% and 100% respectively. Click the blue percentage values to change these as required.

Notes

• Region-based teardrops were introduced in Altium Designer 14.3. In earlier versions teardrops were created from track and arc objects. If required, this style of teardrop can be added or removed by running the Tools » Legacy Tools » Legacy Teardrops command.