Multilayer PCBs

A multilayer PCB is a circuit board with more than two conductive layers of material. Unlike a double-sided PCB, which only has two layers, a multilayer PCB must have at least three layers of conductive material buried in the center of the board.

multilayer pcbs

How are multilayer PCBs made?

Alternating layers of prepreg and core materials are laminated together under high temperatures 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 is adequately melted and cured. The range of material combinations is extensive, from basic epoxy glass to exotic ceramic or Teflon materials. 

Stack up for multilayer PCBs:

The following is the usual stack-up information(4,6,8, 4-layer pcb standard stack-up), which also can be used as a stack-up of impedances.

In other exceptional cases or advanced PCBs (you need to choose ” additional options” and custom stack up or control impedance):

1. if you need a custom stack up or control impedance, we will manufacture it according to your requirements.

2. After placing an order, we will calculate whether it meets the requirements based on the stack, material, and impedance information. Also, we will confirm with you.

4-layer pcb standard stack up / 6-layer pcb standard stack up / 8-layer pcb standard stack up.

The figure above illustrates the stackup of a 4-layer/ multilayer PCB. Prepreg and core are essentially the same material, but prepreg 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 stack, causing the prepreg to “melt” and join the layers together after cooling off—a very hard and solid multilayer board results. 

Benefits of multilayer PCBs

Compared to single or double-sided PCBs

• Higher assembly density 

• Smaller size (considerable savings on space)

• Increased flexibility

• Easier incorporation of controlled impedance features.

• Emi shielding through careful placement of power and ground layers.

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

Applications of multilayer PCBs

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

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

Experienced multilayer pcb manufacturer

We have been producing multilayer PCBs for over 12 years. Over the years, we have seen all types of multilayer constructions from various industries, answered all kinds of multilayer questions, and solved all sorts of problems with multilayer PCBs.

multilayer pcb manufacturer picture

Mass production lead time

lead   time
Lead Time (Wroking   days,ex-factory
10L and upTo be determined based on case

The above lead time is based on:

1. Conventional Material

2. All engineering consultations are confirmed.

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