Stacked or Staggered Microvia?
Microvias are used to connect one layer of the board to its layer and have a very small diameter in comparison to the mechanically drilled vias such as PTH (Plated Through Hole).
There are two types of microvia :stacked and staggered.
Stacked Microvias: are microvias that layered directly on top of each other.
Staggered Microvias: are microvias wh se position on each layer is not directly on top of each other.
Staggered and Stacked microvias improve signal integrity by reducing the size, reducing stub lengths.
Staggered vias are more complex to design, but their manufacturing cost is lower than stacked vias that requires more accuracy checking for the PCB manufacturer.
In term of reliability our recommendation that the stacked structures should be limited to 2 layers of microvia. If the design include third layer of microvia, then the third layer shall be staggered.
Talk to one of our experts to help you choose the right type of microvia for your design.
