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28 Layer PCB: An Integrated Multi-Layer PCBs

PCB is a resilient non-conductive board put up on coated based structure. The PCBs are mainly used to supply electrical bonds and mechanical aids to a circuit.  Also, they are frequent in electronic gadgets, mostly visible as a green-colored board.

The bonding of components found on the board that serves as a pathway to electric signals is through the copper. Active and passive components are firmly mounted on the PCB to meet the form factor of a final design. The form factor is the hardware properties that indicate vital physical properties of a PCB.

To determine the design of a PCB, these form factors are necessary for consideration. PCBs have advanced over time. The advancements experienced in the electronic industry birthed the multilayer PCB.  They vary in complexity while the design began from single layer to complex design such as 28 layer PCB.

What is a 28 Layer PCB?

The growth factor in the electronic industry hinges on the capacity to route electrical signals upended. Vias and surface mount devices enable the smaller size of boards with increased components. The ideal number of layers on a PCB relies on the application needed on the design. Thus, a 28 layer PCB is a design with 28 layers. Also, its space could accommodate the needed number of elements.

A multilayer board has more than 3 layers present in the design. An increase in demand for multilayer was due to the desire of end-users for small complex devices. Also, it is a perfect choice for numerous professional electronic gadgets. The 28 layer PCB consists of numerous laminated layers. It allows for extra circuitry and wiring for composite applications.

The versatility of the multilayer PCB contributed to its growth. As the request increases, so do the number of layers produced increases. Thus, the 28 Layer PCB was specifically produced to meet the demands of composite designs. Applications such as satellite systems, file serve, GPS technology, and many more.

It is crucial to note that the 28 layer PCB could come in a different layout.  However, mostly it is a multilayer rigid PCB design. A rigid PCB design comprises solid materials that do not give room for bend or twist of shape. It has a high lifespan, thus it is the preferred option for use in computers like CPU and GPU.

The 28 Layer PCB being a multilayer rigid design is compact. The number of layers involved aids its compactness. These layers help to impede electromagnetic interference produced by the device. It also offers low design and installation costs for the high-volume fabricating task. It is cost-friendly due to the material selection and holes required for the manufacturing process.

Characteristic of the 28 layer PCB

This type of PCB design is being manufactured massively. Its characteristics are valuable to the growth of the electronic industry. The 28 layer PCB is a multilayer design present in devices like the computer motherboard. The following are the characteristics of a rigid multilayer PCB.

  • The 28 layer PCB is a conventional PCB. It has a flame retardant build-up which increases its rigidity. Also, it maintains a solid shape that can’t fold or twist to any other shape.
  • It also consists of copper traces and paths integrated into the single board. These copper traces connect various elements on the board. Solid substrate forms the base material of the board. It enhances the board’s strength and rigidity.
  • It has solid characteristics that imply the design can only maintain a certain shape. Also, it does not allow for any modification or folding.
  • Another main characteristic of 28 layer PCB is its cost-efficiency. It is cheaper than other types of PCBs. The multilayer PCBs are common in various electronic devices.
  • It is excellent at connecting multiple electronic elements on the circuit boards.

Components of a 28 layer PCB Stackup

Being a rigid multilayer design, the 28 layer PCB comprises different layers. It has a solid shape from different layers joined by adhesive and heat. To develop such design, the following materials are crucial

Substrate Layer

The substrate layer could also be referred to as the base material. It is made of fiberglass that ensures rigidity and solidity of the board. Epoxies and Phenolics could also serve as the base material. However, they are not as efficient as FR4. They are cheaper with a special lousy smell.

Copper Layer

This explains the placement of laminated copper foil on the top of the substrate layer. Applied heat and adhesives aid in the lamination process. Both sides of the board require copper lamination. They could come with varying thicknesses described in ounces per square foot.

Solder Mask Layer

The solder mask layer stays above the copper layer. It serves as the insulator on the copper. This helps to avoid damages that could arise from conductive materials.

Silkscreen Layer

The silkscreen stands above the solder mask layer. It is the material used to add symbols and characters to the board. These characters and symbols help to understand the board better.

Structure of 28 Layer PCB Board

The structure of the board consists of the following:

Through-Hole/Via: Via is an element used to insert components on the board. It makes lines for the connection of more than two layers. However, the non-plating hole is to fix the screw during the assembling process. It is suitable for surface mount positioning.

Marking/Silkscreen: This is an unessential structure. Its primary task is to indicate each part’s name and spot frame on the board. This helps to expedite identification and maintenance after completion.

Dielectric: This material serves as the insulating layer of a 28 layer board. Manufacturers use it to bond the layers of a circuit board. It is also known as copper foil.


A 28 layer PCB comprises different layers of coppers. It is a reliable and functional board. The growing demands of compact devices resulted in the advent of multilayer boards. A 28 layer PCB is a great option for applications that require impedance control. Therefore, this board is well-suited in advanced electronic devices.