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28 Layer PCB

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28 Layer Automotive PCB

Printed Circuit Boards (PCBs) are the backbone of modern-day electronics, and their design and development have paved the way for increasingly complex and advanced electronic devices. Multilayer PCBs have become increasingly popular due to their ability to incorporate more components into a smaller space than traditional single or double-sided PCBs. In the realm of multilayer PCBs, the 28 Layer Printed Circuit Board stands out as a prime example of the advanced and complex technologies that are being developed today.

With a 28 Layer PCB, designers can create more intricate and high-density designs that can reliably withstand environmental and mechanical stresses and perform efficiently in high-temperature environments. The rise in demand for multilayer PCBs, such as the 28 Layer PCB, is in response to consumers’ need for smaller, more complex gadgets and electronics that pack powerful technology into a compact design.

The 28 Layer PCB is designed to meet the requirements for composite applications, such as telecommunications, data servers, GPS technology, and numerous other advanced electronic applications. Its unique multilayer structure allows for more complex circuitry design, greater routing density, and improved signal integrity, making it an optimal choice for high-performance computing devices, military-grade electronics, and high-speed network equipment.

As the electronics industry continues to advance, the importance of small and efficient electronic devices will only grow. PCB manufacturers must stay at the forefront of these developments to ensure that they can meet the industry’s evolving needs. The 28 Layer PCB is an excellent example of how technology is pushing the boundaries of what is possible in the design and manufacturing of advanced electronics.

In this article, we will delve deeper into the specifics of the 28 Layer PCB, exploring its design, manufacturing process, applications, and advantages.

What Is a 28 Layer PCB ?

A 28 layer PCB is a printed circuit board that has 28 layers of insulating material and conductive traces, stacked on top of each other and connected through vias. This type of PCB is a type of multilayer PCB, which has more than two layers and can be used in high-complexity electronics applications that require advanced functionality, high speed, and high reliability.

A 28 layer PCB has a multi-layered structure that allows for a more complex circuitry design, greater routing density, and improved signal integrity, which makes it suitable for use in high-performance computing devices, military-grade electronics, telecommunication systems, and other high-speed network equipment.

Designing and manufacturing a 28 layer PCB is complex and requires specialized software, tools, and expertise. Testing and verification are critical steps in ensuring that the PCB functions as intended and meets the design specifications. Overall, 28 layer PCBs provide significant advantages in terms of performance, reliability, and compactness, making them ideal for use in advanced electronics applications.

Design Considerations for 28 Layer PCBs

Designing a 28 layer PCB requires careful consideration of several factors such as the layer stackup, routing and layout considerations, and signal integrity concerns.

● Layer Stackup: The choice of layer stackup depends on the PCB’s intended function, operating frequency, and thermal considerations. Thus, selecting the right layer stackup is crucial to avoid signal interference and noise.

● Routing and Layout Considerations: When designing a 28 layer PCB, it’s essential to keep the trace length as short as possible to minimize signal delay, crosstalk, and electromagnetic interference (EMI). The thickness of the copper layer and trace width must also be considered.

● Signal Integrity Concerns: Signal integrity refers to the ability of a signal to propagate without distortion. Signal integrity issues are common in high-speed designs, and 28 layer PCBs are not an exception. To achieve signal integrity, high-speed signals must be routed to maintain impedance control, minimize reflections, and reduce jitter and noise.

Other design considerations for 28 layer PCBs include thermal management, power distribution, and ensuring the manufacturability of the design. The cost associated with board fabrication and assembly is also an important factor to consider.

Manufacturing Method of 28 Layer PCB

As a professional PCB manufacturer, we understand that the fabrication of a 28-layer PCB involves numerous essential steps. It is crucial that each of these steps is carried out with utmost precision and attention to detail in order to yield a functional circuit board that meets our high standards of quality and reliability.

● Inner Layer Core Selection: The stack-up approach is utilized to specify the materials necessary for constructing a 28-layered circuit board. In addition to outlining the panel size and copper weight, it also provides critical information concerning the panel’s dimensional aspects and the type of epoxy glass employed in the construction process. This detailed documentation plays a crucial role in ensuring the accuracy and success of the fabrication process, serving as an essential guide for the manufacturer throughout the production process.

● Cleaning: The manufacturer cleans the outer layer of copper by using a chemical cleaning agent. This process is essential in removing any dirt or contaminants that may have accumulated on the surface of the copper, ensuring that the circuit board meets the required standards of cleanliness and reliability.

● Inner Layer Imaging: As part of the manufacturing process, an image material is applied to the surface of the copper, concealing the designated copper circuitry while exposing the undesired copper regions. This procedural step is a crucial aspect of circuit board production, allowing for the precise removal of unwanted copper while retaining the essential circuitry necessary for optimal circuit performance.

28 Layer Military PCB

● Etching: Afterward, the outer layers are sanded by the manufacturer to remove any unwanted copper, and subsequently, the photoresist is stripped away to expose the copper circuit. This procedural step is critical in the production process, as it results in a clean and precise layout of the circuit board, conforming to the design specifications while also ensuring optimal functionality.

● Lamination: As part of the production process, the circuit board layers undergo thermal and compressive treatment within a vacuum-sealed chamber in order to eliminate any entrapped air. This is accomplished by creating a vacuum within the chamber, after which heat and pressure are applied to enhance the interlayer adhesion, resulting in the formation of a robust and reliable PCB.

Drilling: The manufacturing process involves placing the laminated board on the drilling bed, which is then subjected to drilling to create through-holes and vias on the PCB. This is a critical step in the production procedure, where precision and accuracy are paramount to guarantee proper functionality of the circuit board.

● Copper Plating: It is incumbent upon the manufacturer to verify the adequate conductivity of the drilled holes, which are subsequently filled with copper through various means, including electroplating. This chemical procedure involves depositing an exceedingly thin layer of copper within the holes, ensuring that they possess the appropriate electrical conductivity necessary for optimal functionality.

● Testing: Conducting an AOI test is imperative to verify the operational efficacy of a device. With its advanced capabilities, automated optical inspection can detect imperfections that are undetectable to the human eye, making it an invaluable tool in assessing the quality of a device’s performance.

Testing and Verification of 28 Layer PCBs

After manufacturing, a 28 layer PCB must undergo thorough testing and verification to ensure its functionality meets the design specifications. Here are some common methods used to test and verify 28 layer PCBs:

● Visual Inspection: A visual inspection is the first step in testing a PCB. It involves checking for any visible defects or inconsistencies in the manufacturing process.

● Testing for Short-Circuits and Opens: This test checks for any connections between two or more conductive paths. It is done using a digital multimeter and is a quick way to ensure that the PCB functions as intended.

● Netlist Testing: Netlist testing verifies that every connection on the PCB matches the connectivity specified in the design. This test is essential because it can identify hidden defects that might not be detectable through visual inspection.

● Signal Integrity Testing: Signal integrity testing involves measuring the performance of high-speed signals to ensure that they meet the design specification. This test checks for parameters such as signal delay, crosstalk, and electromagnetic interference.

● Thermal and Power Analysis: Thermal and power analysis tests measure how much power is consumed by the PCB and its temperature when operating under different conditions. These tests verify that the PCB can operate within specified temperature and power limits.

● Functional Testing: This testing method involves testing the overall functionality of the PCB by powering it up and verifying that it functions according to the design specifications. Functional testing is the last step in verifying the PCB before delivery to the customer.

By using these testing and verification methods, manufacturers can ensure that the 28 layer PCBs they produce meet the highest quality standards and function as intended.

Advantages and Disadvantages of Using a 28 Layer PCB

A 28 Layer Printed Circuit Board (PCB) is a type of multilayer PCB that has 28 layers of insulating material, each separated by conductive traces and connected through via holes. It is a highly advanced component that is gaining popularity due to its application in high-performance computing devices, military-grade electronics, and high-speed network equipment. However, as with any technology, there are advantages and disadvantages to using a 28-layer PCB.


● Higher Density: A 28 Layer PCB can incorporate a high-density design into a smaller PCB footprint, making it an ideal choice for advanced electronics with a more complex circuitry design. This allows for a more efficient use of space, so the PCB can be used in smaller devices.

● Improved Signal Quality: A 28 Layer PCB provides an excellent option for superior signal quality by allowing for proper grounding and routing of high speed signals that would otherwise be challenging to implement on a single or double-sided PCB.

● Reduced Electromagnetic Interference: The presence of multiple layers helps suppress electromagnetic interference generated by electronic devices, allowing for clearer signals with reduced noise.

● Enhanced Heat Dissipation: A 28 Layer PCB can handle more heat than traditional PCBs, making them ideal for use in devices that generate a lot of heat, including high-end computing devices, military equipment, and servers.

● Greater Reliability: A 28 Layer PCB has a higher level of reliability than single or double-sided PCBs. Its multi-layer structure can better withstand environmental and mechanical stresses, reducing the risk of defects or device failure.


● Higher Cost: Due to the complexity of design, fabrication, and manufacturing, 28 Layer PCBs are more expensive to produce than traditional PCBs.

● Complex Design: Designing a 28 Layer PCB requires specialized software, expertise, and equipment. Without the proper knowledge and experience, designing these types of PCBs can become a significant challenge.

● Quality Control: Quality control for a 28 Layer PCB is more difficult and time-consuming than that of traditional PCBs due to the increase in the number of layers. Any issues in the manufacturing process can lead to defective boards that do not meet design specifications.

● Lead Times: As 28 Layer PCBs require a highly specialized manufacturing process, lead times for production can be longer than those of conventional PCBs.

28 Layer Aerospace PCB

Application of Multilayer 28-Layer PCBs

Multilayer 28-layer PCBs find use in a wide range of applications, particularly in complex electronic devices that require high-performance circuitry. These circuit boards are capable of supporting multiple signal layers and power planes, allowing for the integration of numerous electrical components within a compact design. The high-layer count and advanced design characteristics of these multilayered PCBs make them ideal for use in advanced computer networking devices, high-speed data processing, and cutting-edge telecommunications applications.

There are many applications for multilayered PCBs. They include:

● Computers.
● Storage of data.
● Satellite systems.
● Test equipment.
● Heart monitors.
● GPS technology.
● Industrial controls.
● Hand-held devices.
● Equipment for X-rays.
● Cat scan technology.
● Atomic accelerators.
● Fiber-optic receptors.
● Fiber Optic Receptors.
● Transmission of signals.
● Repeaters for cell phones.
● Central fire alarm systems.
● Nuclear detection systems
● The transmission of cell phones.

Why Should You Choose JarnisTech ?

JarnisTech is an industry leader in multilayer circuit board manufacturing services, boasting the highest standards of tolerances and capabilities. We excel in providing high-quality production, engineering, and technology support services.

Our overseas PCB services in China enable us to offer our customers premium PCBs at a more affordable price point. Serving as a vital partner to our clients, JarnisTech is dedicated to leveraging our expertise in creating custom printed circuit boards and global logistics to enhance our customers’ competitiveness within their respective markets.

Regardless of the location of our manufacturing facilities, whether in China or other overseas regions, JarnisTech operates with speed and efficiency, committing to producing PCBs according to your exact specifications and delivering them on time, thereby streamlining your PCB supply chain.

JarnisTech is the premier source for all your PCB requirements. Contact us today for more information on offshore and domestic printed circuit boards, and we’ll be happy to provide you with a no-obligation quote.

JarnisTech: Domestic and Oversea PCB Capability

Choosing JarnisTech as your circuit board manufacturer provides you with numerous benefits. As a member of the JarnisTech family, you can expect prompt quote responses, flexible lead times, technical support, and access to cutting-edge engineering expertise. We offer a comprehensive selection of PCB options that include everything you would expect from a leading PCB manufacturer.

To cater to the needs of our diverse clientele, JarnisTech offers a wide variety of circuit board printing manufactured on the same production line as your PCB requirements. With strategic manufacturing partners both domestically and abroad, we ensure that our customers receive high-quality PCB boards manufactured to their unique specifications.

At JarnisTech, we are passionate about combining our experience, knowledge, and the latest technologies to provide our clients with world-class PCB solutions that exceed their expectations. Whether you need fast turnaround times, technical support, or customized engineering solutions, we’re committed to delivering superior services, while also helping you reduce costs and lead times.

Fabrication 28 Layers PCB Using Top-quality Substrate Materials

The fabrication of PCBs with 28 layers involves the use of top-quality PCB substrate materials to achieve excellent circuit performance and reliability. These substrate materials are carefully selected for their superior electrical properties, such as low dielectric loss, high thermal conductivity, and superior signal integrity. During the fabrication process, multiple layers of conductive material and insulation are incorporated to create a highly reliable and efficient circuit design. The resulting PCB is well-suited for advanced applications that demand high-speed data processing, complex networking architectures, and optimal circuit performance in challenging operating environments.

● ITEM IT180.
Taconic RF35.
Nelco N4000-13.
Shengyi High-TG170.
Panasonic Megtron 4,Megtron 6.

Surface Method of 28 Layer PCB

The surface method used in the fabrication of 28 layer PCBs involves the application of a conductive surface finish to the board to protect it from environmental factors and ensure optimal performance. This process typically involves the application of a layer of metal to the surface of the board, which serves to protect the circuitry from oxidation and other forms of corrosion.

Moreover, the selected surface finish material plays a crucial role in determining the circuit board’s performance characteristics, such as its resistance to high temperatures, electrical conductivity, and solderability. The surface method employed in the fabrication of 28 layer PCBs is essential in ensuring the boards meet the required standards of performance, durability, and reliability.

● Immersion Tin.
● Immersion gold.
● Immersion silver.
● Hard gold plating.
● Plated gold or plating gold.
● etc…..

28 Layer Immersion Tin Circuit Boards

Prototyping PCB 28 Layer Boards Costs and Delivery

The pricing for PCB production is affected by various variables, such as the size of the board, order quantity, and specific technical requirements of the fabrication process. To provide a precise estimate of the manufacturing costs to our clients, we offer a quotation that is based on the Gerber files provided by the customer.

A typical production lead-time for 28-layer PCBs at our factory ranges from 15 to 21 days, depending on the specifications of the project. However, we understand that many customers may require an expedited service to meet the demands of their project timelines. We accommodate these urgent orders with an expedited service that can deliver their PCBs within one week.

As a customer-centric PCB manufacturer, we take pride in providing our clients with flexible options, high-quality services, and competitive pricing. Our aim is to ensure customer satisfaction by giving our valued clients a seamless and enjoyable experience throughout the entire ordering process.


JarnisTech is a leading pioneer in multilayer PCB manufacturing, with extensive knowledge acquired through working with clients in various industries and applications. We offer exceptional support for projects requiring epoxy, Teflon, and ceramic materials, ensuring that our clients receive PCBs that meet the highest quality standards.

Our state-of-the-art equipment is versatile enough to handle even the most complex multilayer PCB manufacturing, expertly executed by our skilled industry professionals. With a proven track record of satisfied customers, we stand firmly behind the quality of our work and the experience of our team.

Our team of experienced designers takes into consideration factors such as signal and power reliability to deliver top-quality designs that are both effective and easy to produce. With the ability to create any kind of PCB board to meet our client’s specific needs, including using buried or blind vias and through holes, we have the expertise to handle even the most challenging projects.

At JarnisTech, along with our competitive pricing, we stand out from our competitors by offering a unique satisfaction guarantee. We are committed to doing the job perfectly, no matter the industry or application. You can contact us via email or phone to discuss any aspect of the PCB production process or design, and we can provide you with an estimate based on any documents you send us.

Call us to get a free quote now