Editorial Technical Reference

HDI PCB

This page explains how HDI PCB is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A printed circuit board with high wiring density per unit area, featuring microvias, fine lines, and multiple sequential lamination layers.

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Product Specifications

Technical details and manufacturing context for HDI PCB

Definition
High-Density Interconnect (HDI) PCB is an advanced printed circuit board technology that enables higher component density and improved electrical performance through the use of microvias (typically less than 150μm in diameter), fine line widths and spacing (often below 100μm), and multiple sequential build-up layers. HDI PCBs utilize blind and buried vias to create connections between layers without passing through the entire board thickness, allowing for more compact designs and better signal integrity in high-frequency applications. The construction involves sequential lamination, where each layer is added and processed individually, enabling a higher layer count within a thinner profile. Typical parameters include a layer count of 4 to 30, minimum trace width of 0.075 to 0.1 mm, minimum via diameter of 0.1 to 0.15 mm, board thickness of 0.4 to 3.2 mm, dielectric constant of 3.0 to 4.5, maximum board size of 600×600 mm, copper weight of 0.5 to 2 oz, surface finishes such as ENIG, OSP, or HASL, maximum operating temperature of 130 to 150°C, impedance tolerance of ±10%, aspect ratio of 8:1 to 12:1, and minimum annular ring of 0.05 to 0.1 mm. These values are reference ranges and must be verified for specific applications. HDI PCBs are used in compact electronic devices such as smartphones, tablets, and medical equipment, where space is limited and signal integrity is critical. The technology supports high-speed signals and reduces electromagnetic interference. When selecting an HDI PCB, engineers must consider layer count, trace width, via size, and material properties to meet performance requirements. Verification with the manufacturer is essential to confirm that the board meets the required specifications and industry standards such as IPC-2221, IPC-2226, IPC-4101, IPC-6012, IPC-4552, and IPC-2141. These standards provide guidelines for design, materials, and performance, but compliance must be confirmed by the supplier. The directory provides reference data only and does not imply certification or endorsement.
Working Principle
HDI PCBs function by creating electrical connections between components through a complex network of conductive traces and vias arranged in multiple layers. The board uses sequential lamination processes where layers are built up one at a time, with laser-drilled microvias connecting adjacent layers. This allows for more routing channels in a smaller area compared to traditional through-hole PCBs. The fine pitch traces and microvias enable higher signal density while maintaining impedance control and reducing signal loss. Blind vias connect an outer layer to an inner layer, while buried vias connect inner layers only, optimizing space and signal routing. The result is a compact, high-performance interconnect solution for advanced electronic assemblies.
Common Materials
Copper foil, FR-4 epoxy laminate, Solder mask, Surface finish (ENIG, HASL, OSP)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Layer CountRequired4–30 layersTotal number of conductive layers in the PCB
Minimum Trace WidthRequired0.075–0.1 μmSmallest width of conductive traces on the PCBIPC-2221
Minimum Via DiameterRequired0.1–0.15 μmSmallest diameter of microvias in the PCBIPC-2226
Board ThicknessRequired0.4–3.2 mmOverall thickness of the finished PCBIPC-2221
Dielectric Constant3.0–4.5 DkRelative permittivity of the substrate material at specified frequencyIPC-4101
Maximum Board Size600×600 mmLarger panels reduce unit cost but may be limited by manufacturing equipment.
Copper Weight0.5–2 ozHeavier copper carries higher current but increases trace width for same impedance.IPC-6012
Surface FinishENIG, OSP, HASLENIG offers flatness and corrosion resistance; OSP is cost-effective; HASL is traditional.IPC-4552
Maximum Operating Temperature130–150 °CExceeding limit can cause delamination and copper oxidation.IPC-6012
Impedance Tolerance±10%Tighter tolerance requires controlled dielectric thickness and trace width.IPC-2141
Aspect Ratio8:1–12:1Higher aspect ratio improves via reliability but complicates plating.IPC-2226
Minimum Annular Ring0.05–0.1 mmSmaller ring allows tighter via spacing but risks breakout.IPC-6012

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Core Layer Part
    Provides structural support and contains inner layer circuitry
    Material: FR-4 laminate with copper foil
  • Prepreg Layer Part
    Insulating adhesive layer that bonds core layers together during lamination
    Material: Partially cured epoxy resin with glass fiber reinforcement
  • Microvia Part
    Creates electrical connection between adjacent layers without passing through entire board
    Material: Electroplated copper
  • Solder Mask Part
    Protects copper traces from oxidation and prevents solder bridges during assembly
    Material: Liquid photoimageable polymer
  • Silkscreen Part
    Provides component placement indicators, reference designators, and other markings
    Material: Epoxy ink

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for HDI PCB.

High Density Interconnect Printed Circuit Board HDI Board High Density Circuit Board Microvia PCB

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1 atm (standard), vacuum compatible for assembly processes
other spec: Line width/spacing: 50-100 μm, via diameter: 50-150 μm, layer count: 4-20+
temperature: -40°C to +125°C (operational), up to +260°C (reflow soldering)
Media Compatibility
✓ Consumer electronics (smartphones, tablets) ✓ Medical imaging devices ✓ High-frequency RF/microwave circuits
Unsuitable: High-vibration industrial machinery with mechanical stress
Sizing Data Required
  • Required layer count and stackup configuration
  • Minimum trace width/spacing specifications
  • Impedance control requirements and signal frequency

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Microvia cracking
Cause: Thermal cycling stress from repeated heating/cooling during operation or manufacturing, combined with coefficient of thermal expansion (CTE) mismatch between materials.
Conductive anodic filament (CAF) formation
Cause: Electrochemical migration of copper ions through the dielectric material due to moisture ingress, ionic contamination, and applied voltage, leading to short circuits.
Maintenance Indicators
  • Intermittent or complete loss of signal integrity (e.g., data errors, signal dropouts) indicating potential trace or via degradation.
  • Visible discoloration, blistering, or delamination on the PCB surface, suggesting thermal damage or moisture ingress.
Engineering Tips
  • Implement strict environmental controls (humidity < 40% RH, stable temperature) during storage and operation to prevent moisture absorption and thermal shock.
  • Use conformal coating appropriate for HDI applications to protect against contamination and moisture, and ensure proper solder mask alignment to prevent exposed copper.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IPC-6012DA: Qualification and Performance Specification for High Density Interconnect (HDI) Printed Boards IPC-2226: Design Standard for High Density Interconnect (HDI) Printed Boards IEC 61188-5-1: Printed boards and printed board assemblies - Design and use - Part 5-1: Attachment (land/joint) considerations - Generic requirements

Quoted from the published standard.

Manufacturing Precision
  • Minimum Annular Ring: 0.025mm
  • Laser Drill Registration: +/-0.025mm
Quality Inspection
  • Automated Optical Inspection (AOI) for Microvia Integrity
  • Cross-Sectional Analysis for Layer-to-Layer Registration

Manufacturers of HDI PCB

7 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

QueenEMS
Shenzhen, Guangdong, China
Also makes: Heavy Copper PCB, PCB Assembly, Multilayer PCB and 4 more
Managed by the manufacturer
Stated by the company
View profile Send enquiry
Bomin Electronics Co., Ltd.
Shenzhen, Guangdong, CN
Founded 1994over 2,500 staff80 acres
IPC MIL UL
Also makes: Multilayer PCB, Rf Pcb, Heavy Copper PCB and 2 more
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
Huizhou China Eagle Electronic Technology Inc. (CEE)
Huizhou, Guangdong, CN
Founded 20005000 + staff300000
Also makes: Rigid-Flex PCB, Multilayer PCB, Automated Surface-Mount Technology Assembly Line
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
Kinwong Electronic Co., Ltd.
Shenzhen, Guangdong, CN
Founded 1993global over 23,000 employees staff
CNAS ISO/IEC 17025:2005
Also makes: Multilayer PCB, Flexible PCB, Rigid-Flex PCB and 4 more
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
Shenzhen King Brother Electronic Technology Co., Ltd.
Shenzhen, Guangdong, CN
Also makes: Multilayer PCB, PCB Assembly, Electronics Manufacturing Services (EMS)
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
Victory Giant Technology (Huizhou) Co., Ltd.
Huizhou, Guangdong, CN
Founded 2006over 10,000 (global about 16,000) staff543,000 m²
UL safety certification ISO 9001 ISO 14001 ISO 45001 +7
Also makes: Multilayer PCB, Flexible Printed Circuit (FPC)
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
Suntak Technology Co., Ltd.
Shenzhen, Guangdong, CN
Also makes: Multilayer PCB, Rigid-Flex PCB, Flexible Printed Circuit (FPC) and 2 more
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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Frequently Asked Questions

What are typical layer counts for HDI PCBs?

According to reference data, HDI PCBs typically have 4 to 30 conductive layers. The exact number depends on the design complexity and application requirements. Always confirm with the manufacturer for specific products.

What is the minimum trace width for HDI PCBs?

Reference values indicate a minimum trace width of 0.075 to 0.1 mm (75 to 100 μm). This is a general range; actual capabilities vary by manufacturer and process. Verify with the supplier.

What surface finishes are available for HDI PCBs?

Common surface finishes include ENIG (Electroless Nickel Immersion Gold), OSP (Organic Solderability Preservative), and HASL (Hot Air Solder Leveling). Each has different properties; selection depends on application needs. Confirm availability with the manufacturer.

What standards apply to HDI PCBs?

Relevant standards include IPC-2221 (generic design), IPC-2226 (HDI design), IPC-4101 (base materials), IPC-6012 (qualification and performance), IPC-4552 (ENIG), and IPC-2141 (impedance). These are references; compliance must be verified with the supplier.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
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