Stack or Stagger MicroVias?

Stack or Stagger MicroVias?

In a December article I wrote that was published in CircuiTree called “A Fresh Look at MicroVias”, I presented the value of stacking microvias in the context of increased route density.  The full article can be found here:  http://www.circuitree.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000953428

In this blog, I am interested in getting feedback about stacking or staggering microvias so that we can get a sense of how quickly (or not) the industry is moving to stacked microvias.  From what I can determine (based on numerous visits to design centers and fabricators) staggering microvias is still more common; however, more and more fabricators are offering stacking methods.  Has your company evaluated stack methods?  Is the additional cost or the current limit on number of layers the primary reason for not moving to them?  Maybe the fabricator you are working with can only stagger microvias?

Please let us know what your experience is and what you expect your company to do in the future.

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