How to wire between multiple layers of 6-layer stackup ?
There are very few countermeasures available when routing between multiple layers of a 6-layer PCB stack, we focus on sharing: decoupling capacitors
● Decoupling capacitors are kept parallel to the signal via holes, helping to create a proper return path for the signal. and improve the reliability and overall performance of a 6-layer PCB stack.
● Creating an ideal path for inductive returns that occur from transmitted signals between different layers.
How to select the right 6 layer PCB Stackup?
The simple way of select the perfect Stackup of 6 layer PCB is to know the exact demand of the final product and then find appropriate specifications We share some properties can help while you chooseing stackup for 6 layer PCB
Can Venture use Customer-Design in 6 layer pcb Stackup ?
We commonly use two types of 6-layer board stacks.
Type1 and type 2 both with wtih excellent signal integrity & build better returning path for each signal layer ,type 2 can act as a shield because the top and bottom layers having good integrity.
Of course, the customer is absolutely free to choose the stackup, and if you are not sure how to choose the right one, Venture will actively work to design a unique stackup for you, according on the type of application.
Venture 6 layer PCB is manufactured an additional of 2 extra layers between its planes. The classic stack-up of our 6 layer PCB typically includes 4 routing layers (2 internal layers and 2 outer layers). It also has 2 internal planes – one for power and the other one for ground.
Our 6 layer PCB can dramatically improve the EMI by providing 2 buried layers for routing low speed signals and high-speed signals. The signal layers of our 6 layer PCB are closed to the adjacent place.
Your Leading 6 layer PCB Design Supplier in China
Venture 6 layer PCB is broadly used in applications of compact electronics including military equipment, communication modules, and other wearable devices.
Venture 6 layer PCB is manufactured an additional of 2 extra layers between its planes. The classic stack-up of our 6 layer PCB typically includes 4 routing layers (2 internal layers and 2 outer layers).
Our 6 layer PCB undergone high-technology drilling, laminating, and plating process. Our experienced engineers are professionals in 6 layer PCB fabrication.
It also has 2 internal planes – one for power and the other one for ground. Our 6 layer PCB can dramatically improve the EMI by providing 2 buried layers for routing low-speed signals and high-speed signals. The signal layers of our 6 layer PCB are closed to the adjacent place.
We are committed to excellence and innovations in our 6 Layer PCB. Venture is highly skilled supplying great quality 6 Layer PCB. Venture ensures maximum control over quality and the ability to design and produce 6 Layer PCB according to customers’ specifications.
We also have well-trained Layout Engineers to help you match your design drawings and schematic files. We are committed to enhancing prototyping by the production process to quote and delivery.
Venture also offer reasonable cost, excellent services, flexible payment terms, rapid response, and 24/7 tech support. Make Venture Electronics your top supplier of 6 Layer PCB in China!
Inquire us now!
6 Layer PCB: The Ultimate FAQ Guide
In this guide, you will find all information you have been looking for about 6-layer PCB.
So, if you want to be an expert in 6-layer PCB, read this guide.
- What is a 6 Layer PCB?
- What other Arrangements are available for the 6 Layer PCB?
- Why is Dielectric Loss Important in a 6 Layer PCB?
- Why is Pre-preg useful in 6 Layer PCBs?
- What are some of the Dielectric Materials used in the construction of the 6 Layer PCB?
- What is RoHS Compliance Concerning the 6 Layer PCB?
- What Surface Finishes are used for the 6 Layer PCB that are RoHS Compliant?
- How Thick is the 6 Layer PCB?
- What is the Advantage of a 6 Layer PCB Stack-up?
- What are the Factors that Determine the 6 Layer PCB Stack-up Size?
- Why is the Design of a Substrate Important to a 6 Layer PCB?
- Why is Copper Preferred for use in the 6 Layer PCB?
- Where is the 6 Layer PCB Employed?
- Are 6 Layer PCBs Rigid?
- Can 6 Layer PCBs be used for High-frequency Applications?
- What are some of the Properties required for 6 Layer PCB Materials?
- What are Aluminum-backed 6 Layer PCBs?
- What Benefits are Derived in using Aluminiumfor Substrates in 6 Layer PCBs?
- Why are Gold Fingers used on 6 Layer PCBs?
- Is Thermal Management necessary for 6 Layer PCB?
- What are Thermal Vias on a 6 Layer PCB?
What is a 6 Layer PCB?
6 layer PCB
A 6 layer PCB is a multilayer board with four layers dedicated to routing signals and a pair of conductive planes.
You find that this PCB type offers better compatibility to electromagnetic aspects than the four-layer board type.
Additionally, it has an extra pairing of signal layers.
You can configure the six-layer stack in several ways.
A common design has the nether layers employed for channeling signals with low-value frequencies.
Below the topmost layer, the ground is routed after which a signal plane pairing for high-value frequencies follows.
These are then followed by a plane designated for power.
The configuration has decent capabilities concerning the control of emissions.
However, separating the power and ground levels creates a capacitance void that needs to be decoupled as a compensation measure.
What other Arrangements are available for the 6 Layer PCB?
You can find the six layers arranged with the ground and power separating horizontally and vertically routed signal planes respectively.
While plane referencing is typical to this configuration, the first and sixth level signals are unshielded.
Consequently, layers used for signals and neighboring levels need tight packing.
Alternatively, three layers are used as grounds with a pair of signal levels and another for power.
The outermost layers are designated for ground use.
The other ground plane is located in the innermost layer adjacent to the power level.
A major drawback is its compromise on the layers designated for routing signals from four to two.
Why is Dielectric Loss Important in a 6 Layer PCB?
Dielectric loss is a measure of the amount of energy lost in the form of heat by a PCB.
Materials used in the 6 layer PCB should have a low dielectric loss to prevent heat buildup.
When heat builds up in a PCB it can result in thermal strain and lead to board failure.
This is called a dielectric breakdown.
A dielectric breakdown can also occur due to an excessive voltage surge through a dielectric material.
This causes the dielectric material to allow the transfer of electrical charge.
The 6 layer PCB is constructed for defined use and its voltage requirements are taken into consideration during the design phase.
Why is Pre-preg useful in 6 Layer PCBs?
Pre-preg is a contraction of pre-impregnated which highlights the formation of the material.
Pre-preg material typically consists of composite fibers injected with resin to alter material properties.
Modified material properties allow for the extraction of desired performance parameters.
Pre-preg is used in 6 layers PCBs to hold the inner layers together.
What are some of the Dielectric Materials used in the construction of the 6 Layer PCB?
A dielectric material has poor electrical conductivity and is useful in the laminating process.
Dielectrics are used between the conductive films and hold the board together when subjected to elevated temperatures and pressure.
Some materials used as dielectrics are glass, plastic compounds, selective oxides of metal, and ceramics.
What is RoHS Compliance Concerning the 6 Layer PCB?
RoHS means the Restriction of Hazardous Substances.
It is an initiative whose main aim is to minimize environmental damage and adverse health effects of electronics.
It intends to achieve this goal by limiting the usage of identified substances that are harmful to electrical related products.
The 6 layer PCB is an electronic product whose fabrication is subject to RoHS compliance.
You find the 6 layers PCB made with reduced lead quantities to impact its safety levels across its life cycle.
Lead is used at different stages of 6 layer PCB fabrication including lamination, soldering, and finishing.
What Surface Finishes are used for the 6 Layer PCB that are RoHS Compliant?
Surface finishing involves the treatment of the conductive surface before the attachment of components.
Applying a surface finish serves a two-fold purpose of enhancing solderability and offering oxide protection to the conductive trace.
Some of the surface finishes used in compliance with RoHS directive include:
· Immersion Silver
This surface finish involves the creation of a silver lining over the conductive copper.
The board is typically bathed in a solution filled with silver ions.
The surface finish obtained via immersion silver is planar and adheres all right to the solder.
A notable drawback from using immersion silver includes its vulnerability to environmental factors notably atmospheric moisture content and temperature.
Additionally, it is sensitive to how it is handled and stored.
· Electroless Nickel/Immersion Gold
With this surface finish, the conductive copper is first applied with a gold coating by submerging in a gold solution.
A nickel layer is subsequently applied over the gold coating to protect it from oxidation.
The ENIG surface finish offers a fine unstrained finish with an admirable joint upon soldering.
Furthermore, it can tolerate environmental adjustments, different storage, and handling conditions.
How Thick is the 6 Layer PCB?
To determine the overall thickness of a 6 layer PCB, you have to consider the individual layers used in its structure.
Copper films used in the 6 layer PCB have different thickness depending on their weights.
Additionally, the laminates used will also influence the board’s thickness.
Laminates are used in holding the conductive layers.
You find laminates can be provided with thicknesses ranging between 0.008 inches and 0.24 inches.
Common copper foils used in the 6 layer PCB include the half oz, 1 oz, and 2 oz.
It is standard to use a single copper weight for all the layers.
As such you will find 6 layer PCBs with a conductive layer thickness of between 0.031 inches and 0.125 inches.
What is the Advantage of a 6 Layer PCB Stack-up?
6 layer PCB stack up
A stack-up describes how the layers of a multilayer PCB are arranged.
For a 6 layer PCB, you find six conductive layers with prepreg material in between to hold them together.
You find that using a stack-up is cost-effective when you consider the board size compared to a single-sided board.
Also, the quality of signals experienced with the 6 layer PCB stack-up is improved as is its compatibility with electromagnetic environments.
What are the Factors that Determine the 6 Layer PCB Stack-up Size?
The number of layers in a stack-up is not decided on impulse but is rather dependent on certain design requirements.
Proper determination of a stack-up is necessary for the effective performance of a multilayer PCB.
The following features guide the decision to make a 6 layer PCB:
- The required circuitry required for the board
- The desired final dimensions of the board
- The board requirements to ensure electromagnetic compatibility
- The signal distribution required for the layers
Why is the Design of a Substrate Important to a 6 Layer PCB?
The substrate consists of insulating material that provides structural support to the conductive path and connected components.
It gives the 6 layers PCB its shape while also electrically isolating consecutive conductive layers.
You find that when a substrate is inadequately designed through a poor selection of materials, it could lead to several anomalies.
These anomalies can result in increased interference and erratic operation of the 6 layer PCB, negatively hampering functionality and durability.
These anomalies include:
- Poor quality production of transmitted electrical signals
- Crosstalk as well as a higher recording of undesired emissions
- Increased vulnerability to external sources of noise
Why is Copper Preferred for use in the 6 Layer PCB?
While other metal conductors can be employed for the conductive layers of a 6 layer PCB, copper is mostly preferred.
Copper finds favor over other conductive metals because of its exceptional electrical and thermal conductivity.
You find copper can conduct heat away from the conductive layers throughout the entire circuit board and safely dissipate it.
In this regard chances of thermal-induced stress are reduced.
The effect of thermal stress and strain on a board can be catastrophic.
Stress can cause the development of fractures on the PCB’s layers.
On the other hand, the remarkable electrical transfer property of copper allows signal transmission with minimal loss levels.
Another outstanding property of copper is its thermal resistance quality and ability to conduct large currents for large power applications.
With these capabilities, a 6 layer copper PCB has higher durability and tolerance for elevated temperature conditions.
Where is the 6 Layer PCB Employed?
You find the 6 layer PCB employed in applications requiring higher component density with differing power demands.
6 layer PCBs are used in advanced computer systems with large processing needs.
You also find 6 layer PCBs in specialized medical equipment where their increased density allows for smaller but powerful devices.
Some of the equipment includes pacemakers and scanning machines.
Also utilizing 6 layer PCBs are industrial machines with large power needs where multilayers increase the overall copper weight.
In such instances, using multiple layers increases the overall copper thickness allowing more current carrying capacity.
Are 6 Layer PCBs Rigid?
Yes, they are.
Owing to the high layer count, 6 layer PCBs are fabricated to be rigid.
A rigid printed circuit board is based on firm and unyielding material used for the substrate.
The use of this kind of material ensures the board cannot be bent or twisted without breaking.
Can 6 Layer PCBs be used for High-frequency Applications?
6 Layer printed circuit board
High-frequency applications require the dissemination of signals exceeding a single gigahertz.
6 layer PCBs can be contrived to support the transmission of such signals.
The capability of the board will be influenced by the materials used.
To allow proper functionality of the board in high-frequency applications materials needs to have certain desired dielectric properties.
Of most importance is the material’s dielectric constant which needs to be stable to prevent erratic impedance values.
Also important is the material’s dielectric thickness.
Inconsistent impedance is disruptive especially to a signal’s harmonics that can hamper the quality of the signal.
Some of the materials used in high-frequency 6 layer circuit boards include Teflon, epoxy laminate reinforced with glass, and polyphenylene oxide.
What are some of the Properties required for 6 Layer PCB Materials?
Materials used in the fabrication of the 6 layer PCB need to have the following major qualities to ensure effective performance.
- A reduced dielectric loss to minimize stray emission of signals which can adversely affect the signal quality released by the board.
- Close thermal expansion properties. This ensures the materials have a similar response when subjected to temperature changes. Uneven expansion rates can lead to warping as a result of thermal-induced strain.
- Low water absorption rates. Materials susceptible to drawing water from the environment in large quantities negatively hamper their dielectric properties. Increased water content in the material affects the stability of the dielectric constant and increases dielectric loss.
- High thermal resistance which is useful in withstanding the large amounts of heat energy produced in high power applications.
- Resistance to impact that allows the 6 layer PCB to bear rough handling and mechanically induced stress.
- Chemical resistance to prevent damage through chemical interaction such as corrosion which can hamper the board’s signal transfer qualities.
What are Aluminum-backed 6 Layer PCBs?
These 6 layer PCBs employ aluminium material as a substrate as opposed to standard epoxy reinforced with fiberglass.
The aluminium material is layered with a material of insulating quality with a high thermal resistance value.
The insulating material reduces thermal transfer to the aluminium backing from the conductive layer.
The copper film as the conductive layer is typically laid over this insulating material.
What Benefits are Derived in using Aluminiumfor Substrates in 6 Layer PCBs?
6 layer PCBs with aluminium substrates are highly structurally stable finding use in high power applications with small tolerance levels.
You find several advantages of making 6 layer PCBs on aluminium based substrates. They include:
- Low overall board costs due to the wide availability of aluminium in large quantities and at low prices.
Alongside silica, aluminium is one of the most common earth metals occurring almost everywhere on earth.
- Aluminium is a safe material with no harmful substances in its composition posing no health and environmental hazard.
Furthermore, it can be recycled preventing wastage and saving energy.
- The thermal transfer property of aluminium especially concerning heat dissipation is admirable.
Aluminium safely conducts heat from the PCB releasing it to the external environment while also cooling more rapidly.
- The durability of aluminium is remarkable when subjected to mechanical stress. As such, 6 layer boards made with aluminium layers in its structure offer a longer life cycle than standard substrate material.
Why are Gold Fingers used on 6 Layer PCBs?
Gold fingers are the name given to the edge connectors for a 6 layer PCB and also other PCBs.
They bear a resemblance to fingers and have a golden surface finish hence their name.
The use of gold is due to its excellent conductivity.
Gold fingers provide a connection path for peripheral devices such as secondary PCBs to the 6 layer PCB.
This connection path helps with inter-device communication.
Additionally, the presence of the gold fingers on the 6 layer PCB staves board wear.
The gold finish is obtained through electroplating or immersion.
In electroplating, nickel atoms are added to the gold to protect against oxidation.
Alternatively, immersion gold ensures a smooth finish with good solderability and resistance to wear.
Gold finger 4 layer PCB
Is Thermal Management necessary for 6 Layer PCB?
Thermal management refers to the measures taken to control the temperature of a printed circuit board.
These measures seek to prevent overheating of components on the board and the adverse effects of thermal-induced stress.
For a 6 layer PCB, thermal management is vital to ensure no build-up of heat.
Heat build-up can cause hotspots across the board and hamper the board’s functionality.
The 6 layer PCB requires effective design accommodations for the removal of generated heat from the conductive layers.
Notable aspects for thermal management when designing 6 layer PCBs include:
- The board size and population count.
- The conductor trace thickness and spacing.
- The description of components especially concerning their performance.
- The identification of areas on the 6 layer PCB with large thermal dissipations.
- The intended working temperature for the board.
- The proposed cooling procedures for the entire board system.
- The cost of designing for thermal management and its influence on overall board cost.
What are Thermal Vias on a 6 Layer PCB?
Thermal vias are plated through-holes ina 6 layer PCB that allow the conduction of heat.
These type of vias facilitates heat transfer between layers to a common collector point for elimination such as a heat sink.
You find thermal vias in two designs: the simple vias otherwise referred to as via-in-pad and the filled and capped vias.
The simple vias are plated through-holes that connect successive layers providing a path for heat conduction.
Filled and capped vias are plated with a conductive material such as copper and filled with a non-conductive material such as epoxy.
The vias are then sealed with the plating material which prevents the development of voids and solder entry during the soldering process.
You find filled and capped vias can be positioned immediately below a thermal source such as a solder pad.
This allows the direct transfer of heat from the heat source to the vias, therefore maximizing the amount of heat dissipated.
I hope you got answers to questions you have been asking.
In case you have any additional question, feel free to contact Venture Electronics.