What are the back drilled vias?

[Anonymous_Ricky]

hi all,

what are Back Drilled vias and what are the advantages/disadvantages of the same?

thanks & regards,

Ricky

 

[mathewsam2001]

Re: Back drilled vias

A back-drilled via is a normal through-hole via in a PCB that connects two signal layers, but the dangling stub hanging down from the last signal layer to the bottom of the board has literally been drilled out. A drill bit with a diameter a few mils larger than the drilled and plated hole drills a "blind" via to within a few mils of the lowest signal layer. This removes the copper stub and prevents a potentially disastrous resonance in the 5 to 10 GHz range. All high-performance backplanes use back-drilled vias.

 

[amjad]

Re: Back drilled vias

back drill

 

[Mustafa_Engineer]

Re: Back drilled vias

hi

 

[difflvl]

Re: Back drilled vias

It is essentially a more cost effective way of creating a blind via.