What is the difference between 4-layer, 6-layer, 8-layer and 10-layer PCBs?

Table of Contents

multi-layer pcb stackup

4 Layer PCB is a vital part of the electronic components that make up modern devices. Every single electronic component has an electronic counterpart somewhere on the PCB, and in turn, every PCB has holes to hold these electronic components. But what is the difference between 4-layer, 6-layer, 8-layer and 10-layer PCBs? And why do some manufacturers recommend certain thicknesses over others? Let’s take a look.

how many layers pcb can have?

PCB has many layers and each one of these layers is an essential part of your finished PCB. There are some commonly known layers like top, bottom, substrate and so on, but there are more layers also. These additional layers are referred as “functional layers”. Some of the commonly used functional layers are shown below.

  1. Copper Revision layer: This is the first layer that gets deposited on the PCB. This is a critical layer as it decides how the rest of the layers are going to be deposited. It decides how the rest of the layers are going to be deposited.
  2. Solder mask layer: This is a thin layer of copper that protects the topmost layer from oxidization.
  3. Top solder mask: This is a thicker layer of copper that protects the topmost layer from oxidization.
  4. Bottom solder mask: This is a thicker layer of copper that protects the bottommost layer from oxidization.
  5. Substrate: This is the base material of the PCB and it has to be hard enough for the PCB to be attached to.
  6. Dry film: This is a coating of resin that is applied over the substrate.
  7. Wet film: This is the completion of the PCB process and the print head moves over to deposit the copper.
  8. Adhesive layer: This is a thin copper layer that is applied over the wet film to complete the PCB process.

4 Layer PCB

A 4-layer PCB is the base layer of your printed circuit board (PCB). The base layer is where the traces are laid down to transfer signals between the components. The base layer is made of polyimide or polyester. Polyimide is commonly used in military PCBs as it has a very high dielectric strength and is resistant to chemicals, oil and grease. Polyester is commonly used in consumer-grade PCBs as it is highly flexible and can be easily processed with low tension.

4 Layer PCB Stackup

4 layer pcb stackup

A 4 layer pcb board stackup is shown below

1. Top 2 layers of pcb board is ground layers and plating.
2. Lower three layers of pacb board is doped with metal fillers.
3. Middle layer is of regular pcb with metal fillers.
4. Bottom layer is of metal chasis with metal plates, and vias.

6 layer PCB

Next up, we have a 6-layer PCB. Like the 4-layer PCB, the 6-layer PCB is also made of polyimide or polyester. However, in this case, the thickness of each of these layers is increased. This increases the rigidity of the PCB and makes it more durable, but at this point, the performance of the PCB is significantly lower than the 10-layer PCB.

8 layer PCB

And now, we enter the 8-layer PCB territory. The 8-layer PCB is the thickest of all PCBs and is made of polyimide or polyester. The 8-layer PCB is the best of both worlds. Polyimide PCBs are extremely durable and flexible while also being able to process through automated systems relatively easily. Polyester PCBs are extremely flexible but are unable to withstand chemical resistance like polyimide PCBs. The 8-layer PCB combines the best of both worlds and is the most flexible, durable and chemically resistant.

10 layer PCB

And finally, let’s take a look at the 10-layer PCB. The 10-layer PCB is the thickest of all PCBs and is made of polyimide or polyester. The 10-layer PCB is the best of both worlds. Polyimide PCBs are extremely durable and flexible while also being able to process through automated systems relatively easily. Polyester PCBs are extremely flexible but are unable to withstand chemical resistance like polyimide PCBs. The 10-layer PCB combines the best of both worlds and is the most flexible, durable and chemically resistant.

Share:

Facebook
Twitter
Pinterest
LinkedIn

Leave a Comment

Your email address will not be published.

About Author

Aidan Taylor
Aidan Taylor

I am Aidan Taylor and I have over 10 years of experience in the field of PCB Reverse Engineering, PCB design and IC Unlock.

Share

Most Popular

Get The Latest Updates

Subscribe To Our Weekly Newsletter

No spam, notifications only about new products, updates.

Related Posts

welldone pcb manufacturer

Start to Achieve Your PCB Project

Open chat
Scan the code
Hello 👋
Can we help you? Chat with us on WhatsApp↓, or send an email to us: info@reversepcb.com