Why is multilayer PCB so widely used?

Printed circuit boards are the core of most electronic products today, and the basic functions are determined by the combination of components and wiring mechanisms. Most PCBs in the past were relatively simple and limited by manufacturing technology, while today's PCBs are much more complicated. From advanced flexible choices to special-shaped varieties, PCBs have become more diverse in today's electronic world. However, multi-layer PCBs are particularly popular.

What is a multilayer PCB?
The definition of a multilayer PCB is a PCB made of three or more conductive copper foil layers. They look like several layers of double-sided circuit boards, laminated and glued together, with multiple layers of thermal insulation between them. All electrical connections between layers are achieved through through holes such as plated through holes, blind holes and buried holes. Then apply this method to generate highly complex PCBs of different sizes.

Multilayer PCBs have arisen as the times require the ever-changing changes in the electronics industry. Over time, the functions of electronic devices have gradually become more and more complex, and multilayer PCBs have become more and more popular in electronic products. They are available in various sizes and thicknesses to meet the needs of their extended applications, and their variants range from 4 to 40 layers. The number of layers is usually an even number, because an odd number of layers may cause problems in the circuit, such as warpage, and it is not cost-effective to produce. Most applications require 4 to 8 layers, but applications such as mobile devices and smart phones often use about 12 layers, and some professional PCB manufacturers have the ability to produce more layers of PCBs. For example, China's PCB assembly manufacturer-POE Technology

Although the production of multilayer PCBs is often more expensive and labor-intensive, multilayer PCBs are becoming an important part of modern technology. This is mainly due to the many benefits they provide, especially when compared to single-layer and double-layer varieties.

From a technical point of view, multi-layer PCBs have many advantages in terms of design.
• Small size: Due to its layered design, the multilayer PCB itself is smaller than other PCBs with similar functions. This has brought huge benefits to modern electronic products, because the current trend is to focus on smaller, more compact but more powerful gadgets such as smart phones, laptops, tablets and wearable devices.
• Lightweight structure: A smaller PCB is used and the weight is lighter, especially because the multiple connectors required for single-layer and double-layer PCB interconnection are eliminated, which is conducive to multi-layer design.
• High quality: Due to the need for a lot of work and planning when manufacturing multilayer PCBs, these types of PCBs are often better than single-layer and double-layer PCBs. Therefore, they are also more reliable.
• Improve durability: Multi-layer PCBs must not only bear their own weight, but must also be able to handle the heat and pressure used to bond them together. Multi-layer PCBs use multiple insulating layers between circuit layers, combining them with prepreg adhesives and protective materials.
• Enhanced flexibility: Although this does not apply to all multi-layer PCB components, some do use flexible construction techniques to form flexible multi-layer PCBs. For applications where slight bends and bends may occur on a semi-regular basis, this may be a very desirable characteristic.
• More powerful functions: Multi-layer PCBs are extremely high-density components that combine multiple layers into one PCB. These close distances make circuit boards more connected, and their inherent electrical properties allow them to achieve greater capacity and speed, albeit in a smaller size.
•Single connection point: Multi-layer PCB is designed to be used as a single unit, rather than in series with other PCB components. They have a single connection point instead of the multiple connection points required to use multiple single-layer PCBs.

These advantages make multilayer PCBs very useful in various applications, especially mobile devices and high-function electronic devices. Conversely, as many industries turn to mobile solutions, multilayer PCBs have gained a place in more and more industry-specific applications.

Compared with single-layer alternatives, the advantages of multilayer PCBs have become more obvious.
• Higher assembly density: Although the density of single-layer PCBs is limited by their surface area, multilayer PCBs multiply their density through delamination. Although the PCB size is smaller, the increase in density can achieve greater functionality, increasing capacity and speed.
• Smaller size: The size of a multi-layer PCB is smaller than that of a single-layer PCB. Although the single-layer PCB must increase the surface area of ​​the circuit by increasing the size, the multi-layer PCB increases the surface area by adding layers, thereby reducing the overall size. This allows higher-capacity multilayer PCBs to be used for smaller devices, while high-capacity single-layer PCBs must be installed in larger products.
• Lighter weight: The integration of components in a multilayer PCB means that the demand for connectors and other components is reduced, thereby providing a lightweight solution for complex electrical applications. Multi-layer PCBs can complete the same workload as multiple single-layer PCBs, but are smaller in size, fewer connected components, and reduced weight. This is an essential consideration for small electronic devices that need to consider weight.
• Enhanced design features: In general, multi-layer PCBs can exceed the average single-layer PCB. By combining more controllable impedance characteristics, higher EMI shielding, and overall improved design quality, multilayer PCBs can achieve more, even though they are smaller and lighter in weight.

So, what do these factors mean when deciding on multi-layer and single-layer structures? Essentially, if you want to produce small, lightweight, and complex devices where quality is critical, a multilayer PCB may be your best choice. However, if size and weight are not the main factors in product design, then single-layer or double-layer PCB design may be more cost-effective.

Multilayer PCB application
What are the uses of multilayer PCBs in the real world? The answer is any use.
For many industries, multilayer PCBs have become the first choice for various applications. This preference is largely due to the continuous promotion of mobility and functionality by all technologies. Multi-layer PCB is a reasonable step in this process, achieving more functions while reducing the size. As a result, they have become quite common and used in many technologies, including:
•Consumer electronic products•Computer electronics•Telecom•Industry•Medical equipment•Military and defense•Automotive•Aerospace etc
Even household appliances and safety. All devices from alarm systems and fiber optic sensors to atomic accelerators and weather analysis equipment use multilayer PCBs, making full use of the space and weight saved by this PCB format, as well as higher functions.

Why is multilayer PCB so widely used?
The preference for multilayer PCBs mainly lies in industry trends. As electronic technology continues to develop towards miniaturization and multi-functional options, the internal components of these electronic products must follow the same trend. Although single-sided and double-sided PCBs are limited in their ability to balance size and functionality, multilayer PCBs provide a comprehensive solution.
With these irreversible trends and continuous advancements in technology, many people expect multilayer PCBs to become more abundant in the future.Choose POE PCB to manufacture and assemble multilayer PCBs at preferential prices to help you achieve your goals!