4 layerPCB

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When should we know about 4 layer PCB design ?

●The thickness of 40+ mils is sufficient to make the board rigid.
●Stricter routing rules for high-speed signals when using four-layer boards
●There must be a collaborative effort between the IC pin, the package pin and the board designer

●All high-speed signals must start and end at the same level
●The vias on a 4 layer PCB need to plugged to aviod the soler or contaminates go from other side .
Blind vias are unnecessary

When should we know about 4 layer PCB design ?
The Stackups of 4 layers PCB

The Stackups of 4 layers PCB

The top and bottom layers of the 4-layer PCB stack are both signal layers (0.0014 in. wide), the top layer is copper material, followed by a prepreg layer ( thickness ia 0.0091 in./dielectric constant is 4.2. ) The prepreg layer is followed by inner layer 1(planar layer ,0.0014 inches) .

The core sub-layer is part of inner layer 1( width is 0.037 inches).Inner layer 2, which is another flat layer made of 1 oz. The copper thickness is 0.0014 in. Another prepreg sub-layer, consisting of two 0.0091 in. thick sheets, forms part of Inner Layer 2.

How to improve the EMC of 4-layer boards ?

The easiest ways to improve the EMC(Electro Magnetic Compatibility) of a 4-layer board is to keep the signal layer as close to the plane as possible (≤0. OlOin) and use a large core layer (≥0.040in) between the power and ground planes.which has three advantages.

● The signal loop area is smaller and produce less differential mode radiation
●The tight coupling between the signal traces and the ground plane reduces the ground plane impedance (inductance) and thus reduces the common mode radiation from the cables connected to the board
●Tight coupling between traces and planes will reduce crosstalk between adjacent traces

How to improve the EMC of 4-layer boards ?

4 layer PCB

Venture is a professional manufacturer of 4 layer PCB in China for over 10 years now. Throughout the years of providing top-quality 4 layer PCB and excellent services, Venture became the most trusted supplier in China.

4 layer PCB

Our 4 layer PCB is manufactured with excellent interference levels and signal integrity. Our 4 layer PCB has two inner layers that are sandwiched between bottom and top layers. Aside from that, our 4 layer PCB is also equipped with more advanced features that make it perfect for your applications.

Your Leading 4 Layer PCB Supplier in China

4 layer PCB

Our 4 layer PCB is fabricated by our expert and knowledgeable engineers. The top layer of our 4 layer PCB is the signal layer. Then, it is followed by the prepreg layer and dielectric constant. The top layer of our 4 layer PCB is composed of copper material.

The prepreg layer of our 4 layer PCB is followed by the inner layer called the plane. The interconnects of our 4 layer PCB placed and soldered on the bottom and top layers.

Venture 4 layer PCB can provide more surface area for any available traces. The prepreg layer of our 4 layer PCB can bond two or more double-sided boards through the use of pressure and heat. It can also provide excellent dielectric between the layers.

We manufacture 4 layer PCB that consists of VCC plane layers and ground. It is also designed with two signal layers.

Venture 4 layer PCB can achieve a premium quality of signals through the use of propagation levels and reducing distortions. Because of this, more customers from around the world have trusted Venture’s 4 layer PCB.

Whether you are looking for a premium quality 4 layer PCB for your projects and business, you can always rely on Venture!

At Venture, you can always find the best quality 4 layer PCB that comes with the best deals. If you are an electrical engineer or distributor, Venture 4 layer PCB is best for you. We offer 4 layer PCB with no MOQ to support you.

Aside from that, we also offer 4 layer PCB at an affordable rate. A flexible payment term is also provided by Venture to support you! We also have approachable team for customer service. They will assist and guide you for a hassle-free transaction!

What are you waiting for? Contact us now for your next 4 layer PCB orders!

4 Layer PCB: The Ultimate FAQ Guide


This guide will answer all questions you have been asking about 4 layer PCB.

It covers many concepts such as noise reduction, routing, advantages, disadvantages, signal loop, and traces, amongst others.

So, if you want to be an expert in 4 layer PCB, read this guide.

What is a 4 Layer PCB?

A 4 layer PCB has four layers of conductive copper traces used for signal routing.

The layers are identified as the top layer, the inner layer 1, the inner layer 2, and the bottom layer.

You find components positioned on the top and bottom layers.

The two inner layers you use for signal routing and as power planes.

4 layer PCB

 4 Layer PCB

Is a 4 Layer PCB different from other Types of PCB?

Yes, it is.

You find the 4 layer PCB differs with the other PCBs on the layer count.

Other multilayer PCBs have different layer counts with only the 4 layer PCB having four layers.

The 4 layer PCB has a better signal integrity than the 2 layer PCB and with reduced levels of interference.

Why does a 4 Layer PCB have Reduced Noise on the Power Cord?

The quality of a 4 layer PCB is higher and achieved through reduced levels of propagation and distortion.

You find the quadruple layers in a 4 layer PCB augment the signal integrity levels while also minimizing interference levels.

This is achieved by the reduction of inductance in the ground and power wire and as a result reducing the noise voltage.

What is the Name of the Copper Cylinders on a 4 Layer PCB?

Types of Vias

Types of Vias

The copper cylinders in a 4 layer PCB are referred to as vias.

Vias are used to conduct heat and for electric charge transfer within the structure of the 4 layer PCB.

The buried via sprovide connections between internal and external layers.

For example, inner layer one can be linked to the topmost layer by using a buried vias.

Blind vias are only used for connections between the internal layers.

You find identifying a blind vias through visual inspection is not possible due to their location.

Vias can be sealed to thwart entry of solder flux during the soldering process.

When vias are small, they are less likely to experience encroachment from foreign matter.

Entry of foreign particles in the vias can hamper their conductive qualities and impede component connections.

You find vias are not simply sealed by filling them up or by means of a lid.

When sealing vias, care has to be taken to prevent disabled functionality.

You see, the caps or lids can be affected by the movement of air through the vias and changes in temperature.

Vias are useful to the 4 layer PCB in the following ways:

  • Vias allow for better board management in terms of spacing
  • With vias, the board’s component density can be increased
  • The management of wires is effectively done through vias
  • Adapting vias in a 4 layer PCB design allows for the manufacture of smaller boards. These boards can be implemented in portable devices.

What is the Routing Process of a 4Layer PCB?

The routing process for a 4 layer PCB involves establishing connections on each of the layers with a designed role.

Besides, the top and bottom layers are routed to provide component connectivity.

The inner layers form the core of the 4 layer PCB.

You find inner layer 1 used as a power plane whereas inner layer 2 is used as a ground plane.

What are the Advantages of a 4 Layer PCB?

You find the 4 layer PCB with the following attributes:

  • The small size of a 4 layer PCB allows for its use in portable devices such as handheld gadgets.
  • The 4 layer PCB has a lightweight construction which is easier to fabricate.

This compares better to other smaller PCBs that require isolation of individual layers as they are inclined to mobility.

  • You find 4 layer PCBs with improved quality standards due to their intricate construction.
  • There is increased durability with the 4 layers PCB. You find 4 layer PCBs can bear their weight and withstand the heat and temperature conditions subjected to them during lamination.
  • The 4 layer PCB has improved flexibility properties and can be used in situations requiring mild bending and flexing.
  • 4 layer PCBs can handle more power than 2 layer PCBs of the same copper weight. These PCBs can support construction of boards with larger densities allowing increased connectivity. This way you also find their capacity and speeds are impacted by their superior electrical properties.

What are the Disadvantages of a 4 Layer PCB?

The 4 layer PCB is associated with the following drawbacks:

4 Layer PCB Structure

 4 Layer PCB Structure

  • You find 4 layer PCBs are costly when compared to single or 2 layer PCBs. The price disparity is due to the increased layer count which incurs more material and fabrication cost.
  • Constructing the 4 layer PCB is not a simple process. Fabrication of the layers and their lamination requires more sophisticated designs and processes.
  • You will find 4 layer PCBs limited in their availability. This is due to their large production demands which are not available to most manufacturers.
  • Fabricating a 4 layer POCB is time consuming.

A 4 layer construction involves a lot of processes. The inner layers have to be separately fabricated before being bound together with layers for the top and bottom.

Does a 4 Layer PCB have a Signal Loop?

Signal loops on PCB

Signal loop on PCB

The 4 layer PCB has four layers with the inner layers forming the power and ground planes.

These two layers form a large distributed capacitor which enables high frequency for the power supply.

You find that separating the power plane from the ground reduces total signal loop area.

How much Current can the 4 Layer PCB Carry?

You find that the amount of current a 4 layer PCB can carry depends on its trace thickness.

By using thicker copper traces on a four layers PCB, you can greatly increase the amount of current passage.

Furthermore, using wider traces will also positively influence the current capacity of a 4 layer PCB.

Does a 4 Layer PCB have a Multi-layer Circuit Board or Double-layer Circuit Board?

A 4 layer PCB has a multi-layer circuit board rather than a pair of double-sided boards.

In this formation, each layer is fashioned separately with the inner layers typically used as power and ground planes.

The4 layer formation enables the 4 layer PCB to have improved electromagnetic compatibility and a reduced noise voltage.

Furthermore, this construction ensures a reduced area of signal loops with reduced power cord noise.

Overall functionality of a 4 layer PCB is enriched as a result of its configurations.

Where is a Power and Ground Plane Located in a 4 layer PCB?

The power and ground planes are used for connecting the 4 layer PCB to a power and ground source respectively.

These two planes are located in the core of a 4 layer PCB. The core consists of the two inner layers designated 1 and 2.

Connecting components to the planes in routing of the power and ground traces is simpler when in the inner layer.

It provides for a much better installation.

Having a solid power plane and ground plane reduces electromagnetic interference.

This enhances the signal quality.

Does a 4 Layer PCB Thickness Matter?

The thickness of a PCB board holds an important place for a designer during the design process o fa PCB board.

Overlooking PCB thickness during the design process may result in a functionally compromised board.

The PCB may fail or get damaged due to shorts leading to component failure.

The thickness of a 4 layer PCB varies with the use of the board.

When should I Choose a Single Layer PCB or 4 Layer PCB?

The decision to go for a 4 layer PCB or a single layer PCB depends on a number of factors including:

Single layer PCB

4 layer PCB structure

  • The maximum board dimensions for your project. A 4 layer PCB is much thicker than a single layer PCB, and will, therefore, require a more accommodating design.
  • The board functionality. A 4 layer PCB can accommodate more components than a single layer PCB and thus allow a broader set of functions.
  • The production duration. The 4 layer PCB undergoes a more complex fabrication process compared to boards with fewer layer counts. For example, a single layer board takes a pretty straight forward approach with few processes.
  • Budgetary concerns. The cost of making a 4 layer PCB is higher than that of a board with a lower layer count.Designing a PCB with multiple layers is complex venture that attracts increased fabrication costs. The costs are reflected on the final price tag of a 4 layer PCB.
  • Board durability. The durability of a PCB is a function of its longevity while offering useful service in an application. A 4 layer PCB can offer more service for demanding applications compared to a single layer PCB.

Is it Necessary for a 4 Layer PCB to be Green?


The 4 layer PCB does not have to be green.

In fact, you find that it is not the board that is green but rather the solder mask.

Solder mask has traditionally been produced in green but other colour options such as white, yellow, red, and blue are available.

The solder mask is used to protect the copper trace on the board from oxidation.

Additionally, it is used to conceal the solder joints.

Can you use other Metals Apart from Copper in a 4 Layer PCB?

Yes, you can.

Other conductive metals can be used for making the conductive traces on a 4 layer PCB.

The copper tracks create a route for electric charge flow to board constituents.

Some alternative metals used for the conductive trace include aluminium, tin, nickel, and gold.

Copper is however preferred because of its excellent conductivity, availability and cheap cost.

It is cheaper than aluminium and gold whose conductivity is superior whereas tin and nickel are inferior in conductivity.

How are the Traces on a 4 Layer PCB made?

The conductive trace on a 4 layer PCB is used in the transfer of electrical charges to connected components.

In making the conductive trace, two methods are commonly employed.

The subtractive and additive method.

In the subtractive method, the conductive trace is made from etching the copper film.

The conductive pattern is left by removing the excess copper by use of chemical agents.

A protective material is typically used over the desired pattern prevent its reaction with the removal agent.

The additive approach involves the addition of the conductive metal to the plate in the form of the desired trace pattern.

This process can be carried out in several ways such as insertion, plating and the use of conductive paste screening.

This approach is useful when working towards a desired weight of the conductive metal for the traces.

Is Fiberglass used in the making a 4 Layer PCB?

Fiberglass is a plastic compound that is a fiber reinforced with the use of glass.

Some of the ideal properties of fiberglass include its strength by weight and cheap cost.

You find that it is also flexible, transparent to electromagnetic radiation and can be easily molded into different shapes.

Fiberglass is used in the 4 layer PCB to make the core that consists the inner layers.

It is used as a substrate to hold the layers of the 4 layer PCB.

How does a Multimeter Relate to a 4 layer PCB?

A multimeter can be used to test whether current is flowing through a 4 layer PCB.

The multimeter leads are first connected to two points on the conductive trace of a 4 layer PCB.

The multimeter then sends currents via one of the connected probes.

An uninterrupted conductive trace will be identified by the receipt of the transmitted current by the other probe.

This will reflect by the movement of the meter hand.

An interrupted circuit path will be identified by a lack of movement from the meter hand.

What is a Capacitance Test in Relation to a 4 Layer PCB?

A capacitance test is used to check for opens and shorts on a 4 layer PCB.

In this test, an electric charge is supplied to the 4 layer PCB while a probe is used to identify continuity and isolations.

Additionally, you find this test can be used to identify unintended circuit connections.

What is the Manufacturing Process of a 4 layer PCB?

The process of fabricating a 4 layer PCB takes the general form as follows:

The substrate is prepared by processing woven fiberglass.

Thereafter the glass and a resin strain are combined.

They are then rolled to the desired thickness depending on the type of board needed.

The substrate is then semi-cured by taking it through an oven before being panelized.

The cut panes are piled and transferred to a press where they are treated to high temperature and pressure.

This enables the resin to cure and bond the conductive layer to the laminate.

The bonded sheets are subsequently drilled.

Those holes to be plated are metallized.

Drilling is conducted on stacked panels to save on time.

A CNC machine is used to conduct the drilling process, with holes made as per the pre-designed pattern.

Excess debris in the hole is removed through vacuuming.

The holes designed to accommodate transfer of heat or electrical charge are metallized.

Some of the drilled through ways are filled and sealed.

The conductive trace on the copper film is then made through adding copper to the film or extracting the conductive material.

Addition of copper can be through electroplating.

Etching is used to extract undesired parts of the conductive surface.

Extension are positioned along the board’s fringe for communicative connectivity.

Treatment of the extensions precedes plating by using either tin, nickel, or gold.

A coating of tin and lead is then applied by passing the panels in an oven to melt the lead.

The panels are then sealed, stenciled and cut.

This prevents component impairment during board population.

Epoxy is used panel encasing.

Individual boards are then cut from the panels and their edges smoothed.

The board is populated by feeding them to robotic arms called pick and place machines.

Also, the artificially intelligent machines know the precise location of the respective board constituents.

Use of these machines reduces the occurrence of error while enhancing process quality.

The finished 4 layer PCB is packaged in sealed and air free bags before being boxed for shipment.

Packaging is in individual packages because of the delicate nature of PCBs.

What Components can be used on a 4 Layer PCB?

The 4 layer PCB can support several different components whether they are actively recognized in a circuit or are passively identified.

4 layer PCB structure

 PCB Components

Besides, the transistor can contribute to electric charge in a circuit as well as the diode.

A capacitor stores electrical charge.

The charge stored is small and can only sustain a small process when discharged before being exhausted.

To replenish the used energy, an electronic capacitor is continuously charged and discharged via a voltage source.

An electronic diode is a components that allows the flow of current in only one direction.

The diode protects circuits from severe voltages that could be destructive.

Also, the electronic transistor manipulates electrical charges.

A 4 layer PCB contains several electronic transistors.

You can find several ICs offering plenty functionality.

In making ICs, components are miniaturized and grown on a die formation.

They are then interconnected to perform a defined function.

For example, ICs can be used for the conversion of different signals.

What are the Uses of a 4 Layer PCB?

You find many applications for the 4 layer PCB due to its small size, lightweight nature, and impressive functionality.

4 layer PCBs are commonly applied in medical equipment such as X-ray machines, heart monitors, and medical testing devices.

They are also used as electronic mainboards for servers, automobile electrical systems, GPS, and satellite applications.

In short, once you consider everything in this guide, you can choose high quality and reliable 4-layer PCB.

For custom layer PCB design, contact Venture now.

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