Questions and answers

What is blind via ratio?

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 considered a Microvia?

From Wikipedia, the free encyclopedia. Microvias are used as the interconnects between layers in high density interconnect (HDI) substrates and printed circuit boards (PCBs) to accommodate the high input/output (I/O) density of advanced packages.

What size is a Microvia?

IPC used to define a microvia based on its size, which was equal to or smaller than 0.006 inch (0.15 mm).

What is a blind via in PCB?

A blind Via connects exactly one outer layer with one or more inner layers. A buried via is a via between at least two inner layers, which is not visible from the outer layers. This technology allows more functionality in less board space (packing density).

Do blind vias cost more?

A Buried Via connects two or more inner layers but does not go through to an outer layer. BUT: Not all combinations are possible. Blind and Buried Vias add considerably to the cost of a PCB.

Are blind vias expensive?

It is drilled, etched & plated. Subsequently, this layer is laminated with all of the other layers of the PCB. The number of manufacturing steps involved in this method of manufacturing blind vias makes it very expensive.

What is HDI PCB design?

HDI stands for High Density Interconnector. A circuit board which has a higher wiring density per unit area as opposed to conventional board is called as HDI PCB. HDI PCBs have finer spaces and lines, minor vias and capture pads and higher connection pad density.

What is a stacked via?

The Stacked Via: A stacked via consists of multiple vias layered directly on top of each other. Each via is first drilled and then metalized, leaving a small annular ring at the top and bottom to ensure electrical connection. This annular ring is typically very narrow – as thin as .

What are blind and buried vias?

Blind and buried vias are used to connect between layers of a PCB where space is at a premium. 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.

What is the difference between thru hole vias blind vias and buried vias?

A blind via connects an outer layer of the board to inner layers and doesn’t go through the entire board. A buried via connects inner layers without reaching the outer layers. And a through hole via goes all the way through, from top to bottom, connecting all layers.

What is HDI stackup?

What is an HDI stackup? HDI is short for high density interconnect, and refers to the use of buried, blind and micro vias as well as any layer HDIs to create compact boards.