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What's HDI PCB?

HDI board, also known as high-density interconnect board, is a circuit board that uses micro blind buried hole technology and has a relatively high line distribution density.

The HDI board has both inner and outer circuits, which are connected internally by drilling and metallization processes.

Different Types of Vias in HDI PCB

Vias are used to establish electrical connections between the layers, routes, pads, etc.If the multi-layer board is connected through the hole, the size of the PCB can be reduced, and the layer can be stacked.

4 types via are listed:

-Buried via: Connect the through holes of the inner two layers of the multi-layer HDI PCB. This through-hole is always inside the printed circuit board and cannot be seen from the outside. The buried hole is also a plating hole and requires a separate drill file.

-Through via: It is a hole that connects all layers of a multi-layer PCB from top to bottom through the PCB with a drill or laser. Through hole PCBs are easy to construct and are the most cost effective through hole type. Through holes are divided into plated through holes and non-plated through holes.

-Blind via: A hole with a drill or laser to connect the outer layer of a multi-layer high-density interconnected PCB to the inner layer. Since the hole is only visible on one side of the PCB board, it is called a blind through hole. This type of through-hole is difficult to build and expensive.

-Micro via: It is the smallest hole or diameter less than 150 microns, drilled with a laser. Microthrough-holes are most common in HDI PCBS and are often used to connect one layer of a PCB to an adjacent layer, with very small diameters compared to mechanical drilling (such as through holes). Because of their size and ability to connect one layer to an adjacent layer, they enable denser printed circuit boards to have more complex designs.

Advantages of HDI PCB

• The design of high-density interconnects, HDI PCB boards enable smaller electronic devices.

• High-density interconnects also increase the speed and quality of signal transmission, reducing the possibility of signal delay and distortion.

• It also has better heat dissipation performance, which can effectively reduce the working temperature of the equipment and extend the service life of the equipment.

• Reliability and stability have also been significantly improved, making it ideal for many high-performance electronic devices.

High Density Interconnect PCB Sample

HDI PCB Capabilities

Board Type: PCB/FPC/Rigid-flex/HDI…


Material: FR-4/High Tg/Halogen-free/PTFE/ Ceramic PCB/Polyimide

Maximum Finish Board Size: 500*850mm

Maximum finished copper thickness: 8oz

Minimum base copper thickness: 2/2mil (H/H oz base copper)

Minimum trace: 2/2mil (1/3 OZ base copper)

Surface Finish:HASL,HASL lead free, Immersion gold(ENIG), Immersion tin, Immersion silver, OSP

Solder Mask Color: Green/Black /Blue/ Yellow / Red /White

Profiling Punching: Beveling,Routing, V-cut