Multi-layer PCBs

What Is Multi-layer PCBs?

Multi-layer PCBs feature three or more conductive copper foil layers buried in several layers, laminate and glue with heat-protective insulation between every layer, and finally, appear as the double-side circuit board with several layers. Various vias on the multi-layer print circuit board achieve ll electrical connections. Types of these vias include blind and buried vias, plating through holes.

Advantages of multi-layer PCBs

Compared with single or double-sided PCBs, multi-layer PCBs have higher assembly density, flexibility. PCB laminate technology makes multi-layer boards lighter and smaller.

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Applications of Multi-layer PCBs

As the development of electronics industry, the demand of printed circuit board has become more and more complex. Conventional single and double-sided PCB board have not satisfied some high-end industries, so there are multi-layer PCBs for advanced electronic equipment.

Multi-layer PCBs improve the level of performance from limited problems of single or double-sided PCB boards, avoid some limited problems like stray capacitance, noise, and crosstalk.

Muti-layer PCB boards can be used in industries, such as fiber optic receptors, signal transmission, computers, data storage, cell phone transmission and repeaters, statellite systems, test equipment, X-ray equipment, cat scan technology, heart monitors, central fire alarm systems, nuclear detection systems, weather analysis, space probe equipment, etc.

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Why Do PCBs Have Multiple-layers?

Multiple-layer PCB board appears as the development of electronics industry where has some advanced equipment can not be satisfied by conventional single or double-sided PCBs. Multiple-layer printed circuit boards is lighter, smaller, and features higher operation speed than traditional printed circuit boards. All the advantages make them appropriate to be used in high-end electronic equipment like hand held devices, test equipment, heart monitors, etc.

Advantages and Disadvantages of Multiple-layers PCBs


Appropriate for complicate object: Multi-layer circuit boards service for complicated projects that need complex PCB boards usually more than one layer, because this kind of PCB board achieves more advanced PCB design, manufacturing, and assembly technology, and ensures enough room for connection space.

High-quality and durability: Multi-layer PCB boards need specific design and professional assembly production, so there must has high-end and advanced equipment to finish the Multi-layer circuit board manufacturing and assembly.

More efficiency: Made by specific technology and high-technical equipment, multi-layer PCB board is more efficient than conventional printed circuit board. It has higher density, and operation speed that allow it to perform better than traditional printed circuit board.

Smaller size, lighter weight: Multi-layer PCB boards take stack and laminate technology that provide a smaller size and lighter weight for this kind of printed circuit board. Compare with conventional PCB boards, multi-layer circuit boards can be used in smaller space and maintain relatively low weight.

Single connection point: Multi-layer PCB boards use single connection points that were designed on the muti-layer board work together. This specific multi-layer PCB design simplifying the complicate design of electronic devices and reduce size and weight.



Higher costs: Complex multi-layer PCB design means higher costs of labor and high-end equipment. Besides, made multi-layer PCB boards will cost more time than conventional PCB boards. All these factors make higher costs of multi-layer PCB boards.

Narrow application fields: Multi-layer printed circuit board need specialized technology, and always used in high-technical fields like electronics industry, thus it might not be a good choice for every PCB manufacturer. Because of its complex design and professional manufacturing, finding professional people to repair the PCB board might be difficult and higher cost that also cause the less availability of multi-layer printed circuit boards.

How Many Layers Can A PCB Have?

A multi-layer PCB board is a kind of printed circuit board with more than one layer. It is usually used in the electronics industry, and serve for high-technical equipment like hand device and so on. Generally speaking multi-layer PCB boards with layers of 4-12 are very common to used in the electronics industry. Nowadays, the thickest multi-layer printed circuit board has 129 layers.

How are multilayer pcbs made?

Are you curious about the manufacturing process of multilayer printed circuit boards? Next, I will take a brief look at the manufacturing process of multilayer pcbs. In the current manufacturing process of multilayer pcbs, the operation is realized through the circuit connection metal holes, so drilling holes are required in the PCB manufacturing process. And realize the metallization and electroplating operation to the hole, and finally realize the interlayer conduction.

  1. First, make two non-porous double-sided boards, make the inner layer graphics on them, and then subtract the excess copper foil.
  2. The two fabricated inner core boards are glued and pressed together with a prepreg of epoxy glass fiber. Through such a semi-solid-liquid-solid conversion, the prepreg completes the adhesion and bonding under high pressure.
  3. Conventional double-sided board production, the first step is to drill holes, then the outer circuit forms a pattern that resists corrosion, and finally, the surface is coated with a tin layer.

Such a simple multilayer printed circuit board is completed. More other process technologies are needed if you want further to improve multilayer printed circuit boards’ quality.

Do you want to know more? So contact our staff as soon as possible! Let them use professional knowledge to answer you.