Contents
What is blind via ratio?
The blind via ratio is a value that takes into consideration the thickness of your layer versus the width of you via drill hole. The violation can occur because the value entered does not match the Ratio that was used in DRC.
What is micro via in PCB?
Micro-via consists of tiny holes with a diameter of 6 mils or less in circuit boards made by using laser. These holes are plated to connect adjacent layers allowing a PCB to hold more circuit traces which increases the board’s circuit density.
How much current can a Microvia carry?
In other words, it can be used up to 800 mA. The 0.508 mm trace can be used up to 1.4 amps and the 1.27 mm trace can carry up to 2.5 amps without significant heating. Vias have very low resistance and even a 0.35 mm drill via can safely carry 2 amps of current.
What’s the difference between a blind via and a buried via?
A Blind Via connects an outer layer to one or more inner layers but does not go through the entire board. A Buried Via connects two or more inner layers but does not go through to an outer layer.
How are blind vias used in a PCB?
Laser Drilled Blind Vias: These are created after all of the layers in a PCB have been laminated and before the outer layer has been etched and plated. A laser is used to ablate the copper on the outer layer as well as the insulating material between layers 1 and 2.
How are vias created on 2 layer PCB?
Unless you are at home with a DIY via rivet gun on a 2-layer board, vias are created during the PCB manufacture process. Briefly, holes are drilled through copper pads on the PCB, a chemical is put in the hole to dissolve epoxy on the internal layers to further expose the interior layer copper pads.
Which is the most expensive way to form blind vias?
It is the most expensive way to form blind vias due to the extra process steps required and the yield loss associated with handling very thin laminates through the drilling, etching and plating operations. As a result, it should be considered the last resort when blind vias are required.