BackDrill drill files for vias and or pins that
exceed the minimum stub length on selected high
Works on Cadence Versions 14.2 thru 16.x .
See the BackDrill locations, marked with
BackDrill Doughnuts inside the Allegro BRD
Automatically reduces the outer pad size at
each BackDrill location
Protects BackDrills from adjacent copper with
CopperCAD's "C" - Shaped route keepouts.
Use the optomizer to consolidate the BackDrill
drill files, and lower your manufacturing costs.
Copy and Paste the TechFile Stackup report
info into your FAB Drawing.
Instantly calculates the minimum stub length
for your boards stackup.
Works in both metric and imperial units of
The BackDrill drill depth will be calculated
as the last connection layer minus one (1) layer.
If the "minimum Pin Barrel Length" value is
entered, the BackDrill drill depth will be
calculated as the last connection layer minus
one (1) layer or the pin barrel length rounded
up to the next layer, which ever is the larger
In order to remove the pin or via barrel, a
BackDrill with a diameter seven (7) thou
larger than the original drill diameter is
See Amphenol-TCS's ( formally Teradyne's )
White paper on Via Stubs at GB/s data
Amphenol-TCS's ( formally Teradyne's )
Practical Guide to BackDrilling.
On the CCD_BackDrill Top and Bottom layers, a circular
doughnut marks each BackDrill location.
The inner diameter represents the original drill size and the outer diameter represents the new BackDrill drill size.
Re-route those connections to optimize the BackDrill drill files.