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Top 5 things you need to know about HDI technology

HDI stands for High Density Interconnect. Surprising as it may seem, there is no precise definition for this class of PCBs. It really is a variety of technologies that can be combined in unique configurations. The general distinction is that an HDI structure has a higher density of interconnect characteristics than a conventional PCB.

HDI PCB

1. Common characteristics & elements to HDI PCBS

Some of the common elements to HDI PCBs are the following: combinations of via types such as buried, blind and through-hole, fine Traces and Spaces, shorter interconnecting traces, tightly spaced passives (or even embedded passives or passive substrates), as well as coreless constructions (very new concept) and multiple level constructions (not a single thickness).

2. Make space a priority

Considering space when designing HDI PCBs means more than inserting as many components as the board can possibly fit. Determining the amount of space between specific components and optimizing for additional room is a technique that allows you to minimize thermal stress and EMI. Via diameter, pad diameter, and track width should all be considered at the beginning. Not making space a priority might lead you to completely redesign your HDI PCBS.

HDI PCB

3. Many different hdi VIA types

We erroneously think of Blind Micro Vias as being the definition of HDI. While these tiny vias (<150 micron) are always present in HDI designs, they are only one of the processes that could be used in an HDI design. In practice, an HDI design has many of the possible via structures such as thru-hole, buried, blind & micro Via, as well as stacked and multi-level.

4. A wide panel of applications & industries

HDI Technology is often used in critical system industries such as aerospace, medical devices, automotive or the military, or for high performance like the Internet of Things (IoT). The areas and use of the HDI PCB are not limited to these industries. Instead, the circuit board can be used for many things and on many standard products such as digital cameras, mobile phones, laptop computers, network communications or touch-screen devices.

HDI PCB

5. Advantages: flexibility & density - signal integrity & reliability

The flexibility of the HDI components allows unique approaches to satisfy the demands. For example, “layered” structure” where different functions could be on segments of the PCB and the technology of each segment could be very different. The reduction in overall size is also an obvious benefit of HDI allowing more ergonomic and creative designs. HDI technology delivers enhanced signal integrity and is highly reliable.

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