Multilayer PCB is a circuit board that has more than two layers.

The number of layers ranges from 4 or 6 to 60 or even more. Rocket is a pioneer pcb manufacturer of multilayer PCBs, is able to manufacture more than 60 layers of PCBs. We have extensive experience in customers who use these boards in different industries. We can ensure that your circuit board is manufactured according to the strictest standards whether you need is basic epoxy glass or exotic ceramic or Teflon materials.

Unlike a Double-Sided PCB which only has two conductive layers of material, all multilayer PCBs must have at least three layers of conductive material which are buried in the center of the material.

How Are Multilayer PCBs Made?

Alternating layers of prepeg and core materials are laminated together under high temperature and pressure to produce Multilayer PCBs. This process ensures that air isn't trapped between layers, conductors are completely encapsulated by resin, and the adhesive that holds the layers together are properly melted and cured. The range of material combinations is extensive from basic epoxy glass to exotic ceramic or Teflon materials. 

The stackup of a 4-Layer/ multilayer PCB.  Prepeg and core are essentially the same material, but prepeg is not fully cured, making it more malleable than the core.The alternating layers are then placed into a lamination press. Extremely high temperatures and pressures are applied to the stackup, causing the prepeg to "melt" and join the layers together. After cooling off, the end result is a very hard and solid multilayer board. 

Benefits of Multilayer PCBs (compared to single or double-sided PCBs)

Higher assembly density 

Smaller size (considerable Save a lot of space)

Increased flexibility

Simpler impedance characteristics,easier incorporation controlled impedance features.

EMI shielding through careful placement of power and ground layers.

Reduces the need for interconnection wiring harnesses (reduces overall weight)

The entire curing process for the multilayer PCB manufacturer creates extremely rugged solid multilayer boards, This offers a variety of benefits.

Higher assembly density

Reduce the need for interconnecting wiring

Applications of Multilayer PCBs

While the weight and space benefits of multilayer PCBs are especially valuable for Aerospace PCBs, multilayer PCBs are also beneficial to applications where "cross-talk" levels are critical. These are a few other the applications using multilayer printed circuit boards:

Computers

File servers

Data storage

Signal transmission

Cell phone transmission

Cell phone repeaters

GPS technology

Industrial controls

Satellite systems

Hand held devices

Test equipment

X-ray equipment

Heart monitors

Cat scan technology

Atomic accelerators

Central fire alarm systems

Fiber optic receptors

Nuclear detection systems

Space probe equipment

Weather analysis

Rocket PCB is an Experienced Multilayer PCB Manufacturer

Rocket PCB has been producing Multilayer PCBs for over 20 years. Over the years, we have seen all types of multilayer constructions from various industries, answered all types of multilayer questions, and solved all types of problems with multilayer PCBs.