What is HDI PCB?

HDI (High-Density Interconnect) PCB refers to a type of printed circuit board that incorporates advanced

manufacturing technologies to achieve higher circuit density and miniaturization. HDI PCBs are designed to

accommodate the increasing demand for smaller and more complex electronic devices with high-speed performance.

Key features and characteristics of HDI PCBs include:

High circuit density: HDI PCBs utilize microvias, which are small diameter holes drilled with laser technology, to

achieve higher interconnect density. This allows for more intricate and compact circuit designs with a greater

number of components.

Multiple layers: HDI PCBs typically consist of multiple layers, often ranging from 4 to 10 or more, allowing for

increased routing options and the integration of more functionalities into a smaller form factor.

Microvias: Microvias are essential elements in HDI PCBs, connecting different layers of the board. They come in

different types, including blind vias, which connect an outer layer to one or more inner layers, and buried vias,

which connect inner layers without reaching the outer layers. Microvias significantly reduce the size of vias

compared to traditional plated-through holes, enabling higher circuit density.

Fine-pitch components: HDI PCBs are designed to accommodate fine-pitch components, such as microBGAs (Ball Grid

Arrays) and small chip-scale packages. The compact layout and smaller pad sizes on HDI PCBs allow for tighter

component placement and routing, leading to improved signal integrity and reduced electrical noise.

High-speed signal transmission: The reduced size of microvias in HDI PCBs helps to minimize signal loss and

impedance discontinuities, making them suitable for high-speed signal transmission applications.

Advanced manufacturing techniques: HDI PCBs require advanced manufacturing techniques, including laser drilling,

sequential build-up, and precise registration processes. These techniques ensure the accuracy and reliability of

the interconnections in the dense circuitry.

HDI PCBs are commonly used in various industries, including telecommunications, mobile devices, aerospace, medical

equipment, and automotive electronics, where space-saving, high-performance, and miniaturization are critical

requirements.