One-Stop HDI PCB Manufacturing of Stackups from 1+N+1 to 4+N+4

"HDI stands for high-density-interconnected. HDI PCBs have an average of 20 electrical connections per square centimeter on both sides, and the conductor width and spacing are less than or equal to 100 microns."
HDI PCB manufacturer PCBONLINE

HDI PCB vs Microvia PCB

  • HDI PCB is a high-density-interconnected printed circuit board. On the two sides of an HDI PCB, the number of electrical connections on average is 20/cm² or 130/in². And the trace width and space are equal to or smaller than 100µm or 0.004".
  • A microvia has an aperture equal to or smaller than 0.15mm or 0.006" and penetrates only one PCB layer. An HDI PCB typically has microvias in SMT pads. For this reason, microvia PCB is another name for HDI PCB.
  • Besides, the microvias of an HDI PCB can stack to form blind or buried vias. A blind hole penetrates from the external layer to an external layer, while a buried hole penetrates from an external layer to another.
  • Microvias are laser drilled. In HDI PCBs, microvias can be single, staggered, stacked, or skipped. The smaller the microvia aperture, the smaller the parasitic capacitance, which is practical for high-speed circuits.

HDI PCB Lamination

HDI PCB manufacturing process
HDI PCB manufacturing requires sequential lamination. For example, 3+N+3 means the HDI PCB requires three times laser drilling and laminations. The number of microvia pairs stands for how many times of lamination in HDI PCB manufacturing.
The internal layers without microvias are laminated in the standard lamination way under high temperatures and high pressure. Prepreg melts, fills in gaps between adjacent copper layers, and cures so that the copper layers are bonded and insulated.
Lamination to external layers with microvias is more difficult than internal layers. Microvias are laser dilled before lamination, and after lamination, microvias on different layers may overlap to form stacked vias or stagger to form staggered vias. Positioning for laser drilling and lamination should be highly accurate. Otherwise, the board defects. So HDI PCB manufacturing costs more than normal PCBs.

Advantages of HDI PCBs

  • HDI PCBs are suitable for products where electrical performance and noise rejection are of utmost importance. The advantages of HDI PCBs include:
  • ● HDI technology decreases products' overall size and improves electrical performance.
  • ● HDI PCBs have great impedance control and impressive high-frequency transmission capabilities.
  • ● HDI PCBs offer a perfect solution for fine pitch packages, flip-chip assemblies, and complicated BGA designs.

HDI PCB Manufacturing Capabilities

HDI PCB structure

Applications of HDI PCBs

  • ● Battery switches
  • ● Power distributors
  • ● Motor controls
  • ● LED applications control
  • ● Automotive, industrial, communications electronics
  • ● Satellites, microsystems
PCBONLINE's HDI PCB Capabilities

PCB layers

4 to 64 layers

High-density layers

Up to 20 layers

Build time

1 day to 4 weeks


1+N+1, 2+N+2, 3+N+3, 4+N+4

HDI via

Blind via, buried via, staggered via, stacked via, skip via

Minimum laser drill diameter


Final PCB thickness


Minimum trace width/space

Flex/rigid-flex PCBs: 1.6mil/1.6mil
Rigid PCBs: 2.5mil/2.5mil

Minimum mechanical drill diameter

1+N+1, 2+N+2, 3+N+3, 4+N+4 (with copper filling)

HDI PCB production capability

3000m² per day

Copper thickness

100μm to 125μm


>95% (IPC-TM-650 2.4.14)

Advantages of the One-Stop HDI PCB Manufacturer PCBONLINE

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PCBONLINE has 3000m² of HDI PCB manufacturing capability per day
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Provide end-to-end HDI PCB solutions, from the initial idea to high-volume production
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Offer an extensive range of technologies and solutions that meet your requirements
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Varying copper thickness in PCB manufacturing is available from PCBONLINE
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1000 employees, 4 manufacturing bases, 3000m² of HDI PCB production capacity per day
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PCBONLINE's precise and controllable mechanical deep drilling empowers HDI technological possibilities

HDI PCB Certifications

ISO certified
IPC certified
IATF certified
RoHS certified
REACH certified
UL certified

We are solution experts to HDI PCB projects
Contact our team here

HDI PCB supplier

HDI PCB Example 1

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"This is one of the HDI PCBs ordered by a US client from PCBONLNE. These HDI PCBs require selective surface finishes of immersion gold in 2μ" thickness and OSP, half holes, minimum trace space of 2.5mil/2.5mil, and interconnection between inner layers. We brought out excellent results to our client."

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