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DECEMBER 2021 I SMT007 MAGAZINE 115 Common Characteristics and 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 em- bedded passives or passive substrates), as well as coreless constructions (very new concept); and multiple level constructions (not a single thickness). Make Space a Priority Considering space when designing HDI PCBs means more than inserting as many compo- nents as the board can possibly fit. Determin- ing the amount of space between specific com- ponents and optimizing for additional room is a technique that allows you to minimize ther- mal stress and EMI. Via diameter, pad diame- ter, and track width should all be considered at the beginning. Not making space a priori- ty might lead you to completely redesign your HDI PCBS. Many Different HDI Via Types We erroneously think of blind micro vias as be- ing the definition of HDI. While these tiny vias (<150 micron) are always pres- ent 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 through-hole, buried, blind and micro- via, as well as stacked and multi-level. A Wide Panel of Applications and Industries HDI technology is oen used in critical system industries such as aerospace, medical devices, automotive or the military, or for high perfor- mance like the Internet of ings (IoT). e 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 stan- dard products such as digital cameras, mobile phones, laptop computers, network commu- nications, or touch-screen devices. Advantages: Flexibility and Density—Signal Integrity and Reliability e 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. e 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. ICAPE Group has grown to become one of the largest providers of printed circuit boards and custom-made technical parts in the world. Contact us at sales@icapeusa.com or visit us at www.icape-group.com. 1 2 4 5 3