When choosing a manufacturer of high-end HDI boards, what capabilities should be considered? Which one is more crucial among the processes, equipment, and quality control?

With the development of 5G communication, AI servers, high-end smartphones, new energy vehicles and industrial control equipment, high-end HDI boards have become one of the most technologically advanced products in the PCB industry. For purchasing personnel, R&D engineers and electronics manufacturing enterprises, choosing a manufacturer that truly possesses the production capacity for high-end HDI boards is more important than simply comparing prices.

When many enterprises select suppliers, they often only focus on the scale of the manufacturer or the quantity of equipment. However, in fact, the production capacity of high-end HDI boards is a complex system project, involving multiple aspects such as process research and development, equipment configuration, quality management, engineering capabilities, and production experience. So, how can we determine whether a manufacturer truly has the manufacturing strength for high-end HDI boards? Which is more crucial, process, equipment, or quality control?

Why are high-end HDI boards more demanding for manufacturers?

Ordinary PCB production mainly relies on mature processes and standardized procedures.

And high-level HDI boards usually have the following characteristics:

HDI structure of the third order and above

Multiple laminated pressing

Laser micro-hole design

Any-layer interconnection

Ultra-fine circuit fabrication

High-speed and high-frequency signal transmission

These characteristics imply:

Any deviation in any process could lead to the entire board being scrapped.

For example:

The unevenness of the micropores causes a break in the circuit.

Poor filling holes leads to a decrease in reliability.

Interlayer misalignment causes short circuit.

The uncontrolled impedance has caused abnormal signals.

Therefore, high-level HDI boards not only test the equipment, but also test the entire manufacturing system.

The first thing to consider is the manufacturing capability.

If equipment is regarded as a production tool, then the manufacturing capability is the core technology that determines the success or failure of the product.

Many manufacturers possess advanced equipment, but due to a lack of process experience, they still cannot achieve stable mass production of high-end HDI products.

Does the company have experience in high-level HDI mass production?

Key points to understand:

First-order HDI

Second-order HDI

Third-order HDI

Fourth-order HDI

Any Layer HDI (Interconnection of any layer)

Has the mass production been truly achieved?

Some manufacturers claim to be capable of producing fourth-generation HDI, but in reality, they have only conducted prototype verification.

Proven production experience is the true reflection of one's strength.

Whether advanced manufacturing processes are mastered

Currently, high-end products generally adopt:

mSAP process

SAP process

Used to realize ultra-thin circuits.

The assessment indicators include:

Minimum line width

Minimum line spacing

Yield level

For example:

50 μm lines

40 μm line

30 μm lines

Does it have the capability for stable mass production?

Do you have experience in designing high-speed boards?

High-end electronic products usually involve:

PCIe

DDR5

USB4

High-speed SerDes

The manufacturer should have:

Impedance control capability

Signal integrity analysis capability

High-speed PCB design support capability

And not merely following the drawings for production.

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The second factor to consider is the equipment capabilities.

The equipment is an essential foundation for meeting the process requirements.

Without advanced equipment, even the most excellent process plan will be difficult to implement.

Laser drilling equipment

High-order HDI boards extensively use laser micro-holes.

Key points to focus on:

Minimum aperture of laser hole

孔位精度

Drilling efficiency

Advanced equipment can achieve:

50 μm micropores

High-precision positioning

Meet the requirements of high-density packaging.

LDI laser direct imaging equipment

Traditional film exposure is no longer capable of meeting the requirements of high-level HDI.

Advantages of LDI equipment:

High graphic precision

High positional accuracy

The yield is more stable.

It is of vital importance for the production of ultra-fine circuits.

Automatic lamination equipment

High-level HDI usually requires multiple lamination processes.

The advanced press machine can achieve:

Precise temperature control

Pressure control

Vacuum bonding

Reduce inter-layer offset.

AOI and X-Ray inspection equipment

The inspection capabilities directly determine product quality.

In the high-level HDI production process:

AOI (Automatic Optical Inspection) can detect:

Gap

Disconnection

Short circuit

X-ray inspection can detect:

Filling hole defects

Inter-story offset

Abnormal internal structure

The third aspect to consider is the engineering and technical team.

Many enterprises overlook this point.

In fact:

The engineering team often determines whether a project can be smoothly implemented.

DFM analysis capability

DFM stands for:

Makability analysis.

Excellent manufacturers will identify the following issues before receiving orders:

Aperture design risk

The problem of excessive line density

Impedance abnormality risk

Help customers optimize the design.

NPI introduction capability

For new product projects:

The engineering team needs to complete the task quickly:

Process Review

Trial production verification

Parameter optimization

Shorten the development cycle.

Failure analysis capability

When a product has a problem:

Can the manufacturer achieve the following?

Slice analysis

SEM analysis

X-ray analysis

Quickly identify the cause of the problem.

This is an important criterion for evaluating technical strength.

The fourth aspect to consider is the quality management system.

Many people believe that quality is merely the final inspection.

In fact:

A truly excellent quality system is one that implements control throughout the entire process.

Raw material control

Key points include:

Panel brand

Copper foil quality

Stability of PP material

High-end products usually adopt:

High-frequency materials

Low-loss materials

High TG material

Ensure reliability.

Process control

Real-time monitoring of key parameters:

Drilling accuracy

Electroplating thickness

Etching parameters

Pressing temperature

Avoid the risk of mass occurrence.

Shipping inspection

Common inspection items:

Flying probe test

Check the conduction performance.

Impedance testing

Verify the requirements for high-speed signals.

Thermal stress test

Verify reliability.

Metallographic section analysis

Inspection of internal structure quality.

Which is more important among processes, equipment and quality control?

This is the most common question encountered during the procurement process.

In fact, all three elements are indispensable.

But if a ranking is necessary, it can be understood as:

First layer: Process capability

This determines whether the product can be manufactured.

No mature process:

No matter how advanced the equipment is, it cannot achieve stable mass production.

Second layer: Equipment capabilities

This determines the level that the product can achieve.

Equipment Decision:

Precision limit

Efficiency limit

Product grade limit

Third layer: Quality Management

Determines whether the product is stable.

It's not difficult to succeed once.

Continuous and stable mass production is the true sign of strength.

How to quickly assess the actual level of a manufacturer?

Apart from reviewing the promotional materials, it is more advisable to pay attention to the following issues:

Do you have any production cases of HDI with a complexity level above the third level?

This is the most direct proof of capability.

Have you provided services for well-known terminal brands?

For example:

Consumer electronics brand

Communication equipment company

Automotive electronics company

Project experience usually reflects the level of technical proficiency.

Is the yield data transparent?

Key points:

First-piece yield

Batch yield rate

Delivery stability

Do you support collaborative development of technologies?

Excellent manufacturers are not merely producers.

And also a research and development partner.

Be able to participate:

PCB Design Optimization

Process assessment

Product verification

Help customers reduce development risks.