What is HDI PCB?
An HDI PCB (High-Density Interconnect Printed Circuit Board) is a type of circuit board that packs more wiring density per unit area than conventional PCBs. According to IPC-2226, the international standard for HDI design, these boards are characterized by:
- Finer lines and spaces (≤100 µm or 0.10mm)
- Smaller vias with diameters less than 150 µm
- Capture pads smaller than 400 µm (0.40mm)
- Higher connection pad density (more than 20 pads per cm²)
What makes HDI PCB technology special is its use of microvias—laser-drilled holes typically ranging from 50 to 150 microns in diameter. These tiny vias, combined with blind and buried via structures, allow designers to create compact, high-performance boards that would be impossible with traditional through-hole technology.
Why HDI PCB Matters in Modern Electronics
The push toward smaller devices with more functionality has made HDI PCB technology essential. Your smartphone, for instance, contains a motherboard that would have filled an entire desktop computer just 20 years ago. This miniaturization is possible because HDI PCB technology allows:
- Higher component density: More components fit in smaller spaces
- Better signal integrity: Shorter signal paths reduce delays and crosstalk
- Reduced layer count: An 8-layer conventional board can often become a 4-layer HDI board
- Lighter weight: Critical for portable and wearable devices
- Improved reliability: Smaller aspect ratios in microvias mean better plating and fewer failures
The global HDI PCB market was valued at approximately $16.2 billion in 2024 and is projected to reach $24.8 billion by 2029, according to industry research. This growth reflects just how fundamental HDI technology has become across consumer electronics, automotive, medical devices, and telecommunications.
30 July, 2022
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