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High-Density Interconnect (HDI)

Many I/Os in a small area makes it nearly impossible to route to the inner balls with normal PCB fabrication technology. What is required for these connections are layers of high-density interconnect (HDI) with microvias. This technology merges IC fabrication with PCB manufacturing.

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What is high-density interconnect?

High-density interconnect is an advanced manufacturing technique that allows PCB designers to implement a high number of interconnects in a minimal amount of space. It allows you to condense things on a board and overall make it smaller.

The benefits of high-density interconnect technology

Icreased density

By utilizing HDI, you increase your ability to have a much greater density in a smaller footprint.

Routing

Route signal traces through very small component pin-pitch fields and through high component density areas of your board.

Reduce real estate

Gain the ability to strategically connect only certain pads on certain layers, which greatly reduces the need for board real estate.

Key features of high-density Interconnect (HDI)

Define the microvia structure and associated constraints
Specific values for via capacitance and delay are important for constraint adherence (e.g. delay formulas) and simulation accuracy.

Localized rules under components to facilitate escape paths
When doing the fanout, localized rules (trace widths/clearances, via sizes) can be defined to achieve the densities necessary to route away from the high-density pins. Using larger rules everywhere else will result in higher yield.

45° routing for BGA fanout
Routing with true 45-degree angles creates escape paths out of high-density pad regions.

Vias inside SMD land pads
Vias inside pads help facilitate tighter densities.

Via fanout routing schemes
Unique via fanout routing schemes (define what depth to stagger to; router will create appropriate stagger pattern)

Learn more about Xpedition

Dive deeper into this topic

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If you'd like to learn more about HDI read our blog post on high density interconnect (HDI) and ultra HDI PCB technologies.

High-density interconnect resources

High-density interconnect

Frequently asked questions