High-Density Interconnect PCBs

hdi pcb

High-Density Interconnect PCBs

Unlike standard PCBs, HDI allows more components to be placed on both sides of the raw board. The smaller via sizes and laser drilling techniques make this possible.

The number and type of vias, through-holes or microvias you choose will impact cost. Also, you’ll need to consider the type of stack-ups you’re using.


High-density interconnect PCBs pack more components into smaller packages to save space. They also reduce the number of layers and the overall board size. This can help improve design efficiency and lower manufacturing costs. However, the cost of fabricating a multi-layer HDI PCB is dependent on several factors. These include component selection, buried and blind vias, the stack-up, and the drilling method. A careful consideration of these factors is critical to the success of your project.

The fabrication process of an HDI PCB involves more steps and a higher threshold of expertise than conventional PCBs. These complexities can increase manufacturing costs. For example, the production of a single layer of an HDI board requires a much longer cycle time than a conventional PCB. In addition, the fine lines and spacing in HDI boards require a much more precise process than ordinary PCBs. In order to achieve the required precision, manufacturers use semiconductor Class 100 clean rooms.

In addition, the production of an HDI PCB requires a multi-step process that includes plating, filling, and capping. The process is usually a 10- to 12-step one that requires specialized equipment and skilled technicians. Additionally, the production of an hdi pcb HDI board requires a laser-drilled hole with a tighter aspect ratio than a mechanically-drilled hole. The aspect ratio of an HDI hole is a key factor in the reliability of the circuit board.

High-Speed Transmission

Compared to traditional PCBs, HDI circuit boards have a higher signal strength & reliability. They also have a smaller footprint & require less power. Moreover, they have a lower risk of RFI/EMI, thermal conduction, & static discharge issues. These features make them ideal for use in a wide range of high-performance electronic devices such as mobile/cellular phones, touch-screen devices, laptop computers, digital cameras, 4/5G network communications & even military applications.

To increase routing density, manufacturers produce a PCB with multiple layers of high-density interconnecting materials, which are then laminated together with prepregs. These laminates are then pressed & heated, which liquifies the prepregs. They then stick to the inner copper layers & form a stack-up. These stack-ups can contain blind & buried vias. The number of laminations required depends on the design – a complex stack-up requires a few sequential lamination processes.

When choosing a stack-up, consider your manufacturing constraints and the capabilities of your HDI PCB manufacturer. You also need to select the right via type, which will affect production cost and time. For example, a via-in-pad process can reduce the number of sequential laminations & material costs. It also allows you to route impedance controlled traces & follow your fabricator’s DFM rules. These factors will ensure your hdi pcb is produced efficiently & effectively. Aim for a design that maximizes space utilization & minimizes interference with signal transmissions.


In today’s fast-paced digital world, the devices associated with it are getting smaller and more complex. This means that electronic circuit boards must be HDI PCB Supplier able to connect to those components more efficiently. This is why high-density interconnect PCBs, or HDI, are so important. These PCBs allow designers to fit more interconnections in a smaller space, enabling them to create small, lightweight, and compact devices.

HDI PCBs also offer better signal veracity than standard printed circuit boards. This is because they eliminate via stubs, which can interfere with signal transmission. Additionally, they use blind via and via-in-pad technology to reduce the length of signal paths. This allows them to accommodate fine-pitch BGA packages and other surface mount components with minimal space requirements.

To achieve these benefits, HDI PCBs are fabricated using a sequential lamination process, where the copper layers and pre-pregs are combined with heat and pressure. The result is a board with a thinner, stronger layer structure and lower thermal stress. In addition, these boards require tighter spacing between traces and pads, as well as a reduced dielectric thickness. The use of these techniques requires specialized manufacturing equipment and more precise component placement. This can increase the overall cost of a PCB, but it is worth the investment for the increased functionality that results from this miniaturization.

Military Applications

The military and aerospace industries need specialized PCBs to handle complex electronic equipment. They need to withstand extreme environmental conditions and perform critical functions reliably. Working with a manufacturer that specializes in these industries will ensure that your PCBs are high quality and meet your performance specifications. Epec is one such manufacturer, which has invested in specialized equipment and manufacturing expertise to provide you with the best possible product.

Compared to traditional PCBs, HDI PCBs have thinner lines and tighter spacing, making them ideal for high-density routing. This allows for more components to be packed into a smaller space, which is beneficial for military and aerospace applications. The higher circuit density also helps reduce power losses. In addition, the buried and blind vias reduce stray capacitance and inductance.

These PCBs are often used in radar installations. These devices use a transmitter to send signals that can detect objects, including aircraft and ships. They are also useful for tracking and monitoring threats and for conducting military operations. In addition, they are also useful for analyzing ciphers, codes, and encrypted text.

HDI PCBs are typically made from fr-4, which consists of epoxy resin and electronic-grade glass fabric. They are separated by partially cured laminates and then stacked like a book with layers of prepreg on the top and bottom. The stack-up is then pressed and heated, which liquifies the prepregs and sticks the layers together. The final product requires several numbers of sequential lamination cycles.