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28 Layer PCB

Jarnistech > Multilayer PCB > 28 Layer PCB
28 Layer Automotive PCB

Printed Circuit Boards constitute the bedrock of contemporary electronics, and their conceptualization and evolution have revolutionized ever-complex and advanced electronic devices. The popularity of multilayer PCB is on an upward trend, primarily owing to their capacity to house more components within a relatively small area compared to conventional single or double-sided PCBs. Within the domain of multilayer PCBs, the 28 Layer Printed Circuit Board shines as a stellar instance of technologically advanced and complex systems that characterize today’s developmental strides.

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. For example, encompassing telecommunications, data servers, GPS technology, and a vast array of other sophisticated electronic applications. Its distinct multilayer structure permits more intricate circuitry patterns, enhanced routing density, and better signal integrity. Therefore, it emerges as the superior selection for high-performance computing gadgets, military-standard electronics, and high-velocity network apparatus.

With the ongoing progression of the electronics sector, the significance of compact and effective electronic devices will undoubtedly amplify. 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 exemplifies brilliantly how technology is challenging the limits in the conceptualization and fabrication of sophisticated electronics.

In this post, we aim to probe further into the particulars of the 28 Layer PCB, investigating its designing, fabrication procedure, uses, and benefits.

What is a 28 Layer PCB?

A 28 layer PCB refers to a printed circuit board featuring 28 strata of insulating substances and conductive pathways, piled up cohesively with interconnections through vias. These PCB circuit board a member of the multilayer PCB family which possesses more than two layers, is 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. Therefore, these PCB Boards are very 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. Thorough testing and validation are imperative stages to ensure that the PCB operates according to plan and adheres to the design criteria. In sum, the 28 layer PCBs offer remarkable benefits regarding their performance, dependability, and space-saving features, rendering them perfectly suited for employment in progressive electronic 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. In order to procure optimal signal integrity, it is pivotal to guide high-speed signals in a way that manages impedance effectively, minimizes reflective disruptions, and curbs jitter and noise.

Additional design deliberations for 28 layer PCBs encompass thermal management, power disbursal, and ensuring the feasibility of the design’s manufacturability. The cost implications related to board fabrication and assembly play an indispensable role in the overall considerations.

Manufacturing Method of 28 Layer PCB

As an expert Printed Circuit Board manufacturer, we comprehend that manufacturing a 28-layer PCB necessitates numerous pivotal procedures. Precise execution and meticulous observation during each of these procedures is paramount to producing a functional circuit board that aligns with 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 fabricator incorporates the use of a chemical cleanser in the processing of the external copper layer. This step is imperative in eliminating settled impurities or contaminants that might have clung onto the copper surface. Consequently, this ensures that the circuit board fulfills the mandatory cleanliness and reliability standards.

● 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: In the course of the fabrication stages, the circuit board layers undergo thermal and compressive treatment within a vacuum-sealed chamber in order to eliminate any entrapped air. This is achieved by generating a vacuum in the compartment, followed by the application of heat and pressure, bolstering the stickiness between layers and culminating in the construction of a sturdy and dependable PCB.

● Drilling:  During the fabrication phase, the laminated board is positioned on the drilling stage that subsequently goes through a precise drilling operation to introduce through-holes and vias onto 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: Implementation of an AOI examination is integral to ascertain the functional performance of an apparatus. Owing to its advanced capabilities, automated optical inspection is adept at discovering faults that remain invisible to the naked eye. It, therefore, indispensably serves as a critical instrument in evaluating the caliber of a device’s execution.

Testing and Verification of 28 Layer PCBs

Upon fabrication, a 28-layer PCB necessitates undergo testing and verification to affirm that its functioning aligns with the pre-set design guidelines. Below are some prevalent techniques employed for the testing and verification of 28-layer PCBs:

Visual Inspection: The initial phase in the PCB testing procedure involves a visual Inspection. This process includes the identification of any observable manufacturing anomalies or deviations.

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: The process of signal integrity examination encompasses the quantification of high-speed signal performance to ascertain their adherence to design specifications. This Testing checks parameters like signal latency, electromagnetic meddling, and crosstalk.

Thermal and Power Analysis: Thermal and power analysis tests quantify the power consumption of the PCB and its Analysisoperational temperature under varied circumstances. These tests verify that the PCB can function within the stipulated temperature and power thresholds.

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, we can ensure that the 28 layer PCBs our 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. This highly sophisticated circuit board is gathering increased traction owing to its application in high-functionality computational devices, military standard electronics, and high-velocity network apparatus. Nevertheless, akin to every technology, there exist pros and cons of using a 28-layer PCB.


● Higher Density
● Improved Signal Quality
● Reduced Electromagnetic Interference
● Enhanced Heat Dissipation
● Greater Reliability


● Higher Cost
● Complex Design
● Very Difficult Quality Control
● Long Time Delivery

28 Layer Aerospace PCB

Application of Multilayer 28-Layer PCBs

The realm of application for multilayer 28-layer PCBs is considerably vast, particularly in intricate electronic devices that necessitate superior-performance circuitry. These circuit boards are capable of supporting multiple signal layers and power planes, thereby allowing for the inclusion of numerous electrical components within a condensed design. The elevated layer tally and advanced design attributes of these multilayer PCBs render them perfectly suited for use in sophisticated computer networking devices,high-speed data processing, and cutting-edge telecommunications applications.

Here are many applications for multi-layer PCB. They include:

Computers, data storage, satellite systems, testing devices, heart monitors, GPS technology, control systems, for industries, portable gadgets, X ray equipment, CT technology, particle accelerators, optical fiber sensors. Also known as fiber optic sensors. And signal transmission.

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

Opting for JarnisTech as your circuit board fabricator bestows a host of advantages upon you. As clients of the JarnisTech, you can get fast replies to quotations, flexible lead times, technical support, and access to cutting-edge engineering expertise. We proffer an exhaustive assortment of PCB options encompassing all expect you’d envisage from a top-tier PCB fabricator.

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’re fervent about fusing our skills, expertise, and cutting-edge technologies to furnish our clients with top-notch PCB solutions that surpass their anticipations. Whether your requirements entail fast project completion, technical assistance, or bespoke engineering solutions, our commitment lies in offering unparalleled services, simultaneously aiding in diminishing expenses and accelerating production timelines.

Fabrication 28 Layers PCB Using Top-quality Substrate Materials

The make of 28 layer PCBs necessitates the utilization of superior PCB substrate materials to ascertain exemplary circuit function and dependability. These substrate materials are carefully selected for their superior electrical properties, such as low dielectric loss, high thermal conductivity, and superior signal integrity.

Amid the fabrication procedure, an amalgamation of conductive material layers and insulation is integrated to create an extremely reliable and efficient circuit design. Consequently, the finished PCB is ideally equipped for complex applications requiring rapid data processing, intricate networking structures, and optimum circuit performance under rigorous operational conditions.

The following are advanced PCB base materials was used in Multilayer PCB Manufacturing:

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

Surface Method of 28 Layer PCB

The manufaturing employed in generating 28-layer PCBs encompasses the implementation of a conductive surface finish on the board. This is essential to safeguard it from environmental elements and promote peak performance. Standardly, this process includes applying a metallic layer to the board’s surface, 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 cost of PCB fabrication isn’t a set price, it’s influenced by numerous factors such as the board dimensions, order volume, and certain technical stipulations of the manufacturing process. To equip our clients with an accurate projection of manufacturing expenses, we offer a tailored quotation predicated on the Gerber files that are supplied by the client.

Standard manufacturing duration for 28-layer PCBs in our facility varies from 15 to 21 days, contingent upon the project’s requisites. Nevertheless, we appreciate that numerous customers may need a rush service to align with their project schedules. We cater to these prompt orders with a swift service that ensures their PCBs are delivered within a week.

As a customer-focused PCB producer, we take exceptional pride in tendering our clients adaptable options, superior services, and cost-effective pricing. Our goal is to assure client contentment by rendering a frictionless and gratifying experience throughout the entire order arrangement.


JarnisTech towers as a resounding front-runner in the realm of multilayer PCB fabrication, 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, ensure to our commitment to providing our clients with PCBs that adhere to the most stringent quality benchmarks.

Our cutting-edge equipment has the adaptability to navigate even the most intricate multi-layer PCB fabrication, adeptly handle by our skilled industry professionals. With a proven track record of satisfied customers, we confidently endorse the caliber of our fabrication capabilities 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, in addition to our market-competitive rates, we stand out from our competitors by offering a unique satisfaction guarantee. We encourage you to connect with us via email or telecommunication to explore any element of the PCB fabrication process or design specifics. Moreover, we have the capacity to provide you with free estimate costs built upon any PCB Gerber data you.

Call us to get a free quote now