How Are Multilayer PCBs Manufactured


What is a Multilayer PCB?

There are different types of PCB; multilayer PCB is a circuit board that has more than two layers.PCB is made from more than three conductive copper foil layers buried in the center of that is the core of electronics. Today PCB is much more complicated.

Multilayer PCB Production Process

Producing the PCB is the multi-stage process and complex. There are few essential steps of providing the multilayer PCB

Pre-Production Engineering (PPE)

The data which is supplied by customers is used to generate the production data for the specific PCB (drill the data from drilling programs and artworks for the imagining process).

Engineers equate demands/specifications to enforcement capacities and often assess process measures and related tests. While choosing a multilayer PCB manufacturer, consider picking PCBONLINE as they have years of experience. You can check details about the process and overall details here at

Issues About Material

From approved sources, the material of various types is received and stored in a regulated environment until they required.

While using the FIFO system various materials used even in the specific purchasing demand according to the required shapes and size

Each of the materials used can be traced back to the batch they make.

Inner Layer

Step 1, using an artwork film, is to transfer the image to the surface of the board UV light to polymerize the artwork’s dry film and using photosensitive dry film. The step is done in the cleanroom.

Inner Layer Etch

Step 2 the panel using removes the damaged copper layer After removing the upper layer of this copper, the next step comes to remove dry material, leaving behind the copper circuitry that suits the design.

AOI Inner Layer

Circuitry inspection against digital “images” to check that the circuitry matches the design and is defect-free. Executed by scanning the board, and then trained inspectors will verify any aberration highlighted by the scanning process.


The inner layers have an oxide layer added and then “stacked” to the top and bottom of the stack along with pre-preg, which provides insulation between copper foil and layer.

In the process of lamination, there are some essential things to consider, like temperature, pressure, and flow. It helps to allow rise to everything sequentially and binds the layers together to form a solid multilayer panel within the pre-preg process.


We will now drill the holes, which will then create electrical connections inside the multilayer PCB. This is a mechanical drilling method that needs to be designed so that all internal layer contacts can be recorded. At this process, the panels may be stacked.A laser drill used for drilling, especially in the case when it is attached with a production video.

Finalize the Surface

Different finishing materials used on the exposed area of the copper it helps to smooth the upper layer of the surface. Immersion gold and silver is a type of finishing material. These are proven methods because these are tested according to thickness and solidness.

Final Electrical Inspection

This final test is the most important step because it tracks the issues in connection to ensure safety also, it is called proper checkup of circuits to avoid any serious accident.

There are two main types of test available according to the volume like:

  1. Flying probe (for smaller volume)
  2. Fixture based ( Large volume)

Finally, Step Arrived When We Check PCB Visually Like Circuit Connections and Covers, etc.

Multilayer PCB Manufacturing Issues

Alignment of Layers

Sometimes more than two layers messed up with each other mostly. It happens when a dozen layers used in the PCB.

In short, proper position and arrangement make the flow of current more smooth.

Accuracy in the Drilling Process

Multilayers are aligned and drilled concurrently, which means its alignment is not that simple at the end of the stack larger hole can produce great deflection. This can cause great damage to the PCB circuit.


Exceeded levels of moisture can interrupt the smooth operation of circuit contamination can damage the circuit boards and operational parts. PCB moisture can be controlled during the packaging with a quality manufacturer.

Advantages of Multilayer PCB:

Along with above details and issues in Multilayer PCB manufacturing, you might eager to know the advantages of multilayer PCBs. There are multiple advantages  and it’s considerable because of its high function and capabilities, flexibility and rigid, lightweight, small sizes, improved designed functionality, as well as increased in durability.


There are different companies manufacture PCB circuits and want to judge about exact precision that is required to manufacture PCB. It is a complicated process, but you can follow this procedure step by step to get a quality product. Always consider a reputable brand while choosing a PCB circuits as the reputation of company and quality matters a lot.



Ali Dino
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