8-Layer Flex PCB: Manufacturing, Advantages & Applications

8-layer flex printed circuits are generally used in devices with space concerns, like mini portable devices, wearable gadgets, laptops, and communication devices. 8-layer flex PCBs are quite complex and costly, which is why an experienced and skilled manufacturer is recommended. Various well-known brands deliver quality PCBs without causing any trouble to the customers. They have a full team of skilled professionals who do their best to fulfill all your required needs and develop a high-efficient 8-layer flex PCB in the end.

8-Layer Prototype PCB

The 8-layered FR4 PCB prototype consists of 8 layers of solid material that are firmly interconnected with each other and develop a mutual pathway of connection between each layer. The stack of eighth layers added more complexity to the manufacturing process of FR4-PCB. Twisted traces are widely used names in the manufacturing industry of prototype PCBs.

This prototype has many ground and power planes. It helps in preventing the ground plane from noise coupling. More planes are provided to protect the signals from mixing up with the signals of neighboring layers. More layers also help in signal routing that requires matching. Also, impedance control is needed on traces, especially for analog signals. 

What Is An 8-Layer Flex PCB?

An 8-layered printed circuit board is a kind of multilayer circuit board. Its main function is to enhance the routing space of devices that need various power grounds. However, this 8-layered PCB helps in increasing the performance of EMC by adding two more planes. 

This 8-layered PCB is usually mounted on packed devices with less space. The increment in EMC performance automatically increases the overall cost of an 8-layered PCB. The 8-layer stack of PCB consists of 4 layers of wiring and four layers of planes. The wiring layers are then connected with seven dielectric material rows. 

Generally, the circuit board contains six layers of circuitry with high EMC performance. At the same time, the 7th and 8th layer is then added to a solder mask for enclosing the circuit, thus making an 8-layered Printed Circuit Board. The stack of 8-layered PCB must design according to the following pattern:

Signal 1 / Ground / Signal 2 / Power / Ground / Signal 3 / Power / Signal 4

Materials Used For Manufacturing 8-Layer Flex PCB

Full PCB Manufacturing

The material used in each 8-layer PCB stack determines its functionality. Therefore, choosing a suitable material is a crucial step in the production process of the PCB. Conductive material and substrate are widely considered a suitable match for making a high-efficient 8-layered PCB.

· Substrates

Glass epoxy is a type of substrate that helps in insulating the signals and heat. This is suitable for maintaining the integrity of the circuit even in high temperatures. Moreover, substrates have a high temperature of glass transition which helps in maintaining the structure of the PCB. 

· Conductive Materials

Copper is one of the effective and widely used conductive materials in the manufacturing process of 8-layered PCB. It has high thermal conduction ability, which allows a uniform path for the signals and dissipates the extra heat from the surface of the boards, and this makes it an ideal choice material. Moreover, copper is cheaper than other conductive materials, such as silver and gold. 

Advantage of 8 Layer Flex PCB

Kicad Flex PCB

The stack 8-layered PCB offers a variety of benefits. Due to these benefits, it is an ideal choice of printed circuit board for many devices. Some main advantages of 8-layered PCBs are as follows:

1. Reduce Radiation

Multilayers of PCBs help the device eradicate the radiation that is usually produced in high-speed devices. Though not all other multilayer stacks of PCB are able to manage electromagnetic waves, an 8-layered PCB supports the device in removing the electronegative disruption radiations. 

2. Minimize Vulnerability

An 8-layered PCB enhances the overall efficiency of the device while reducing the vulnerability rate. It protects the internal copper layers from noise by reducing the vulnerability of distracting external factors. 

3. Increase Functionality

The biggest advantage of using an 8-layered stacked PCB is enhancing the speed and overall functionality of the application. They are suitable for many electronic devices and give reliability. However, the four conductive layers improve signal mapping. 

4. Reduce The Cost 

An 8-layer stack PCB costs a lot as it requires high-quality material. But in actuality, if we look at the cleaning and replacement of the PCB, it saves much. This is because an 8-layered PCB does not require high cleaning and maintenance, thus making it durable. 

Application of 8 Layer Flex PCB

The 8-layered printed circuit board is one of the common multilayer PCBs. With its flexible and durable nature, it is widely used in various sectors of fields like chemical, manufacturing, automobile, medical, and aviation industries.

Factors That Define the Cost Of 8 Layer Flex PCB

Polyimide Stiffener

The manufacturing process of an 8-layered PCB costs a lot. However, various factors add up to the cost equally. Generally, the usual price of one multilayer PCB costs $3, but this could change according to various factors. 

· Size Of The Circuit Board

The size of the PCB varies with the number of components. If there are various components, the size automatically increases. However, the increase in size will lead to an increment in the overall cost of the manufacturing process of the PCB. 

· Thickness

The thickness of the board varies with the type of material used on the board. The thicker the size of the board, the more the price automatically adds up. Moreover, thickness totally depends upon which type of substrate or material is used to make each layer. 

· Finishing types

Finishing is also a factor that affects the overall price of the manufacturing process of the PCB. Finishing of 8-layered PCB has several options available, and each option costs differently. Some popular finishes are ENIG, IMM, ENEPIG, and HASL. 

· Hole sizes

The number of holes also affects the overall price of the PCB. If the number of holes increases, the cost of the process will also increase. This is because the thinner hole requires more working processes. 

· Custom Specifications

Specific and custom changes also add up to the overall cost of the 8-layered PCB. The more requirements ultimately cost high. 


The 8-layered Flex PCB has gained immense popularity recently. The usage of this multilayer stack is also increasing in various devices. The manufacturing process and its usage require skilled knowledge.

That is why an experienced manufacturer is only able to give a full-function 8-layered stacked PCB. The primary function of the 8-layered PCB is to enhance the speed and functionality of the device. It improves the integrity and quality of signals. It requires quite a time to make due to its complex structure and design.

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