HDI PCB Manufacturing Service

HDI PCB Manufacturing for Microvia, Blind & Buried Via Designs
HDI PCB

Custom HDI PCB fabrication from prototype to production, supporting laser microvias, via-in-pad, sequential lamination, controlled impedance, and high-density multilayer stackups.

  • Certified Quality: ISO & IPC Class 3
  • Fast Turnaround: 2-6 Day Prototypes
  • Advanced Capability: 1-64 Layers
  • Dedicated Support: From RFQ to Delivery

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HDI PCB Services You Can Rely On

HDI PCBs, or High-Density Interconnect printed circuit boards, are designed with fine lines, blind and buried vias, and dense via-in-pad routing to increase connection pad density while reducing size and weight. Our HDI products are manufactured to meet tight PCB layout requirements, utilizing high-quality materials and refined design techniques.

Capability Service Range
HDI Structures 1+N+1, 2+N+2, 3+N+3, stacked and staggered microvias
Via Technology Laser microvia, blind via, buried via, via-in-pad, copper-filled via
Materials FR4, High-Tg FR4, Rogers hybrid, low-loss materials by request
Surface Finish ENIG, OSP, immersion silver/tin, lead-free HASL where suitable
Inspection AOI, X-ray, E-test, microsection, impedance test

These boards reduce layer count, enable fine pitch BGA layout, and maintain stable signal paths in dense digital systems. We support HDI PCB prototyping and production from 1 to 10,000+ units with fast lead times and full turnkey PCB assembly.

hdi-flex-circuit-board

Our HDI PCB Manufacturer Capabilities

Laser Microvia Drilling

Our HDI PCB manufacturing process supports blind via formation using UV laser drills with a minimum diameter of 100 μm and aspect ratios up to 1.2:1.

Copper plating inside the microvia is controlled to 12 μm minimum, with pad flatness verified after resin fill and cap plating.

Every HDI circuit board undergoes cross-section analysis to confirm via barrel quality and wall thickness uniformity before stack-up lamination.

Parameter Specification
HDI PCB Types HDI rigid board, HDI rigid-flex board, HDI flexible board
Via Structure Types ≤18 layers any-layer interconnection / 8+N+8 structure
Drilling Method UV Laser
HDI Microvia Types Stagger via, Step via, Skip via, Stack via
Minimum Via Diameter 3 mil
Aspect Ratio (Dielectric Thickness to Hole Diameter) ≤1.2:1
Microvia Filling Method Copper electroplated
Dimple in Via Fill ≤10 μm
Copper Overhang at Via Opening ≤10 μm
Inspection Method Cross-section analysis
Stack-Up Integration Verified before lamination

OrinewPCB builds HDI PCBs with up to 4 lamination cycles, using vacuum compression to bond alternating core and prepreg layers.

This process supports complex HDI layout configurations, including 1+n+1, 2+n+2, and staggered or stacked buried via constructions.

Dielectric flow is constrained using controlled glass weave prepregs, and each cycle is registered within ±25 μm across the panel.

All HDI boards are patterned using LDI systems that achieve trace widths down to 1.8 mil with registration accuracy of ±12 μm.

Imaging tolerances are maintained through real-time photoresist alignment and temperature-controlled etch chambers.

This allows high-density interconnect routing beneath fine pitch BGA pads and enables differential impedance control within ±5 Ω across stripline geometries.

Via-in-pad structures are applied to HDI PCB designs requiring minimal routing distance and high thermal transfer.

Laser-formed microvias are resin-filled and copper-capped, with flatness maintained to within ±15 μm to support solder joint co-planarity.

This PCB HDI technology is used in BGA component mounting, where via stubs must be eliminated to prevent impedance discontinuities and reflow instability.

We fabricate HDI circuit boards with up to 64 layers, supporting stackups from 1+n+1 to 8+n+8.

Minimum dielectric thickness is 50 μm, with copper distribution balanced between internal and external layers to maintain planarity under thermal load.

Designs using blind and buried vias are modeled to reduce z-axis path lengths and layer count, improving signal routing without compromising thermal reliability.

PCB stocks a range of PCB laminate materials, including standard Tg FR4 (Tg 135–140°C), high Tg FR4 (Tg ≥170°C), Isola 370HR, Rogers 4350B, and Panasonic Megtron-6, selected based on dielectric performance, decomposition temperature, and mechanical durability.

Copper foil options range from 9 μm to 400 μm, and prepreg combinations are tailored to support controlled impedance, mechanical stiffness, and dielectric stack uniformity across the full PCB layout.

Every HDI PCB is verified using AOI for trace registration, X-ray for via and pad alignment, and electrical testing against the supplied netlist.

Time-domain reflectometry (TDR) is used to validate impedance traces within ±5% tolerance.

Every HDI PCB is traceable through process control logs and certified to IPC-6012 Class 2 or Class 3 for fabrication quality, and follows IPC-2221 for general layout and trace spacing guidelines.

We support HDI PCB prototype builds starting at 1 unit and scale to high-volume runs exceeding 10,000 pieces.

Standard lead times range from 5 to 15 working days, with quick turn PCB production available in as little as 48 hours, depending on layer count and surface finish.

All jobs include DFM checks to ensure manufacturability of complex geometries before fabrication begins.

Why Choose OrienwPCB as Your HDI PCB Manufacturer?

OrinewPCB provides end-to-end control across PCB fabrication, material selection, and inspection processes to support complex designs with tighter tolerances, fewer layers, and better signal performance. Each board is built to meet the demands of high-speed, high-density interconnect applications.

Expertise in Complex HDI Layouts

We manufacture HDI PCBs with stacked microvia structures, blind and buried vias, and fine-line geometries down to 1.8 mil.

Our engineering team reviews each HDI PCB layout for routing efficiency, layer pairing, and thermal constraints before production, reducing layer count and improving impedance stability across high-speed paths.

Advanced Microvia Drilling and Filling

Laser-formed microvias are drilled to 4 mil minimum diameter and resin-filled with dielectric matched to the surrounding layers.

Our plating process deposits 25 μm of copper into each via wall, followed by planarization and cap plating to maintain pad flatness within ±15 μm for BGA and CSP assembly.

High-Tg and RF Material Selection

We support HDI PCB fabrication using materials like IT180, S1000-2M, and Rogers 4350B for applications requiring high decomposition temperature (Td > 300°C) and low dielectric loss.

These laminates are paired with prepregs selected by dielectric constant and thickness to meet signal integrity requirements for high-speed digital and RF PCB designs.

Certified Quality Control Processes

Every job includes AOI, X-ray inspection, impedance modeling, and netlist electrical testing.

Boards are certified to IPC-6012 Class 2 or Class 3, with conformance documentation and full traceability.

We also provide microsection analysis to confirm dielectric thickness, annular ring width, and via wall integrity.

Scalable Production and Fast Lead Times

We handle everything from HDI PCB prototype runs to high-volume orders.

Quantities from 1 to 10,000+ pieces are supported with lead times ranging from 2 days (expedited) to 4 weeks.

Jobs are prioritized based on layer count, copper weight, surface finish, and material selection to ensure delivery accuracy.

Responsive Engineering Support

Our technical support team provides detailed DFM reviews and helps resolve layout, stack-up, and material compatibility issues before production.

We accept Gerber, ODB++, and IPC-2581 design data, and guide clients through proper documentation and PCB design and manufacturing constraints to reduce revisions and delays.

What is HDI PCB?

A high-density interconnect PCB is a multilayer board with a higher wiring density per unit area than standard designs, achieved through the use of microvias, blind and buried vias, and 2 to 3 mil trace widths. HDI PCBs have finer spaces and lines, minor vias and capture pads and higher connection pad density. It is helpful in enhancing electrical performance and reduction in weight and size of the equipment. HDI PCB is the better option for high-layer count and costly laminated boards.

HDI technology originated in the early 2000s with single microvia layers and has progressed to multi-build-up configurations with stacked, copper-filled vias used in mobile, automotive, and aerospace designs.

HDI PCB vs. Standard PCB

Aspect Standard PCB HDI PCB
Component Density Typically <100 pins/in², limited by mechanical via size and trace spacing ≥120 pins/in² supported through microvias, fine lines, and via-in-pad routing
Drilling Method Mechanical drills only; min hole diameter ≈ 6 mil Laser drilling for microvias down to 4 mil with tighter positional tolerances
Via Structures Through-hole only, with long z-axis path Blind vias, buried vias, stacked and filled microvias with controlled depth
Trace/Space Capability Commonly 5 to 6 mil trace/space 2.5 mil / 2.5 mil or finer with LDI registration accuracy to ±12 μm
Layer Count 4 to 16 layers typically required for complex nets Often 6 to 10 layers with optimized routing due to high interconnect density
Stackup Flexibility Symmetrical cores with limited sequential build-up options 1+n+1, 2+n+2, 3+n+3 with multi-cycle lamination process and custom dielectric setups
Routing Efficiency Long signal paths and via stubs increase EMI and reduce bandwidth Shorter routing with minimal via stubs improves signal integrity and reduces EMI
Impedance Control Basic control using microstrip/stripline; wide tolerances (±10 to 15 Ω) Modeled to ±5 Ω using hybrid PCB laminate sets and calibrated TDR measurements
Support for Fine Pitch Not compatible with BGA pitches under 0.5 mm Fully supports fine pitch (≤0.3 mm) CSPs and dense I/O arrays
Board Size and Thickness Larger footprints and thicker profiles due to higher layers of a PCB Reduced form factor with fewer layers and thinner dielectric stacks
EMI Performance Susceptible to loop-area EMI from long traces and through-vias Improved EMI control via short transitions and tightly stacked interconnect boards
Fabrication Cost Lower for low-density applications with basic features Higher per unit, but offset by reduced layer count, smaller board size, and routing gains
Application Suitability General consumer, hobbyist, low-frequency circuits Advanced PCB designs in telecom, automotive, aerospace, and portable electronics

Types of HDI PCB Structures

HDI designs are classified from Type I to Type VI based on the number and placement of microvia layers. Type I includes a single-layer microvia with no buried vias. Type II introduces buried vias beneath one build-up layer. Type III and higher include stacked microvias, filled and plated, across multiple layers. Type IV to VI use coreless substrates or every-layer interconnect (ELIC) for full vertical routing flexibility.

Structure Type Via Configuration Supported Scale
1+N+1 Single-layer build-up with blind vias Prototype, small to large-scale production
2+N+2 (Staggered) Dual-layer build-up with staggered blind and buried vias Prototype, small to large-scale production
2+N+2 (Stacked) Dual-layer build-up with stacked blind and buried vias Prototype, small to large-scale production
3+N+3 Triple-layer build-up with stacked vias across HDI layers Prototype, small to medium-scale production

Note: “N” represents the number of standard layers between the outer HDI layers. All constructions are fabricated using sequential lamination and resin-filled microvias for electrical and thermal stability.

Applications of HDI PCBs

Consumer Electronics

Smartphones, tablets, and wearable devices rely on HDI PCBs to support fine pitch components, high-speed memory interfaces, and compact enclosures.

Microvias and via-in-pad structures allow dense BGA routing with reduced layer count, improving signal timing and lowering power consumption in multilayer PCB assemblies.

Automotive Systems

Advanced driver-assistance systems (ADAS), infotainment units, and in-vehicle networking modules use HDI circuit boards for stable signal integrity and mechanical durability.

Boards are built with buried vias and high Tg laminates to withstand thermal cycling, vibration, and solder reflow during harsh automotive environments.

Medical Devices

Diagnostic equipment, implantables, and patient monitors use HDI PCB constructions for size reduction, EMI control, and biocompatibility with low-profile packaging.

We offer multi-layer flex construction with stacked microvias, blind and buried vias, and conformal coating options.

Stacked blind vias enable high-functionality circuits within small footprints, improving performance in signal acquisition, wireless telemetry, and imaging modules.

Industrial Automation

Robotic controllers, PLCs, and embedded sensor modules integrate HDI PCBs to reduce space while managing high I/O requirements.

PCB design and manufacturing constraints are optimized for durability, low crosstalk, and support of isolated analog and digital planes in harsh factory environments.

Telecommunications Equipment

Routers, baseband processors, and high-speed transceivers demand HDI layout with 2.5 mil routing, laser-drilled vias, and high-layer-count designs.

These configurations support differential pairs, RF shielding, and low-loss transmission needed for signal clarity in 5G and optical backbone systems.

Aerospace and Defense

Avionics, radar systems, and secure communication hardware require high-density interconnect PCBs with tight tolerance control and high signal fidelity.

Sequential lamination and filled via-in-pad techniques help maintain impedance and electrical stability in mission-critical systems exposed to altitude, shock, and EMI stress.

HDI PCB FAQs

HDI PCBs use laser-drilled microvias and fine-line routing to reduce signal delay, reflection, and crosstalk in high-speed interfaces like DDR and PCIe. Optimized layouts lower layer count by enabling direct interconnects between dense BGA pads and internal traces, reducing stub length and board thickness.

Resin-filled via-in-pad structures maintain pad flatness and solder joint reliability, while high-Tg materials and precise PCB design techniques support stable impedance and EMI control in telecom, medical, and automotive systems.

Yes, we provide standard stack-up diagrams or custom layer configurations based on your specific HDI PCB layout and impedance needs. Our engineering team will model copper distribution, dielectric spacing, and via structure placement before fabrication.

We offer scaled pricing for HDI PCB manufacturing, including discounts for repeat orders, high-volume runs, and 4+ layer boards. Contact our team to get a quote tailored to your build and material selection.

We primarily use Gerber RS-274X, but we also support ODB++, IPC-2581, and other standard design data formats. IPC-2581 improves CAD-to-CAM translation, reducing manufacturing errors and speeding up pre-production review.

Important considerations include via structure selection (staggered vs. stacked), PCB stackup balance, controlled impedance modeling, and copper-to-dielectric ratio. Designers must consider prepreg flow, resin fill compatibility, trace spacing for EMI control, and laminate Tg to meet thermal limits.