adding microvia in PADS layout

[viperpaki007]

Hi,

I need to add microvias of 50um diameter with drill size of 47um for 0.4mm pitch BGA package routing. So far i am unable to find options in PADS layout to put such small microvias. I tried to define microvias of 50um dimensions using

Setup>Pad stack>Pad stack type>Via

The probelm is that the software does not accept such small via dimensions. When i put via diameter of 2mil and drill size of 1.85mil, software starts complaining that your drill size is more than via size..:/

Can anybody help. Screenshot is attached

 

[barry]

Where are you getting the error?

Regardless, I seriously doubt you are going to find anyone who can make a via with a .000075" annular ring, as you are specifying.

 

[viperpaki007]

Hi, I found out the solution for above problem, First, i was not reading the via dimension, for 0.4mm pitch BGA, properly. Real via dimensions for 0.4mm pitch are 9mil via pad and 5 mil laser drill. Moreover, i made the following to 0 in PADS layout.

Tools>options>Design>drill oversize=0