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Uncover cutting-edge possibilities with our Ultrathin PCBs, reshaping electronics through advanced engineering and sleek design.

With the continuous development of electronic equipment, the demand for circuit boards is also increasing. In particular, the demand for thinness and compactness in modern electronic products has promoted the widespread application of ultra-thin PCBs (Printed Circuit Boards). Ultra-thin PCB not only improves the portability and functionality of the device by reducing thickness and weight, but also meets the requirements for high-density integration. This article will introduce in detail the design, materials, manufacturing processes, application fields and advantages of ultra-thin PCB to help you better understand the innovation of this technology and achieve greater success in electronic product development.

What is Ultrathin PCB?

Ultra-thin PCB (Printed Circuit Board) is an extremely thin circuit board, usually less than 0.4 mm thick. Compared with traditional PCBs, ultra-thin PCBs significantly reduce the overall weight and volume of the device while maintaining the same electrical performance. Therefore, it is widely used in modern electronic products, especially in those devices that have strict requirements for high density and lightweight.

The design and manufacturing of ultra-thin PCBs requires special processes and materials. Commonly used substrates include FR-4, polyimide (PI) and copper foil. FR-4 is a fiberglass reinforced epoxy resin with excellent mechanical strength and electrical properties suitable for most applications. Polyimide is often used in flexible circuit boards (FPC) because of its excellent heat resistance and flexibility, which can meet the needs of specific applications. In addition, the manufacturing of ultra-thin PCBs requires precise photolithography and etching processes to ensure that complex circuit patterns are realized on thin boards.

Ultrathin PCB Manufacturer
Ultrathin PCB Manufacturer

Due to its significant weight and volume advantages, ultra-thin PCBs are used in many high-tech fields. For example, in the field of consumer electronics, smartphones and tablets are designed to be thinner and lighter, so ultra-thin PCBs have become an ideal choice. Ultra-thin PCB not only reduces the weight of the device, making it more portable, but also provides the possibility for a more compact design, improving the competitiveness of the product.

In the field of wearable devices, the application of ultra-thin PCB is also indispensable. Devices such as smart watches and fitness trackers need to be worn on the human body. Thin and light circuit boards can improve wearing comfort and reduce interference with user activities. In addition, the flexible design of ultra-thin PCB enables it to adapt to various complex wearing scenarios, such as bending or curling, which is difficult to achieve in traditional rigid PCB.

Medical devices are another important application area. Many portable medical devices, such as ECG monitors and blood glucose meters, require the device to be small and lightweight so that patients can carry it daily. Ultra-thin PCB not only meets these requirements, but also ensures high reliability and stability of the device and provides accurate medical data. This is critical to improving patients’ quality of life and treatment outcomes.

In addition, ultra-thin PCBs also play a key role in aerospace, automotive electronics and other fields. Aerospace equipment is extremely weight-sensitive, and every gram of weight saved can significantly improve fuel efficiency and flight performance. The application of ultra-thin PCB can help avionics equipment achieve lightweight design without sacrificing its functionality and performance. In automotive electronics, advanced driver assistance systems (ADAS) and in-vehicle entertainment systems also benefit from the high density and lightweight properties of ultra-thin PCBs, making the systems more compact and efficient.

In short, ultra-thin PCB, as an advanced circuit board technology, plays a vital role in modern electronic equipment. Its unique lightweight and high-density characteristics not only improve the performance and competitiveness of the equipment, but also open up new application scenarios. With the continuous advancement of technology and optimization of processes, the application prospects of ultra-thin PCB will be broader, continuing to promote the development of electronic products in the direction of thinness, intelligence and efficiency.

Ultrathin PCB design Reference Guide.

When designing ultra-thin PCB (Printed Circuit Board, printed circuit board), special attention must be paid to the following aspects to ensure that its performance and reliability can meet application requirements.

Material selection

Choosing the right material is a critical step in ultra-thin PCB design. Typically, the choice of substrate and conductive materials directly affects the thickness and performance of the PCB. FR-4 is a common substrate with excellent mechanical strength and electrical properties, but polyimide (PI) is increasingly favored in ultra-thin designs. Polyimide has good flexibility and heat resistance, making it suitable for making flexible PCBs. Copper foil is a commonly used conductive material, with a thickness usually between 12 microns and 35 microns. When selecting materials, their mechanical strength, thermal expansion coefficient, and electrical properties need to be considered to ensure that thickness can be reduced without affecting overall performance.

Laminated structure

Multi-layer design is an important means to achieve high-density circuits, but in ultra-thin PCBs, the design of multi-layer structures is particularly complex. To ensure signal integrity and thermal management, the stack-up between layers must be carefully designed. First, the signal layer and ground layer should be properly arranged to ensure that electromagnetic interference (EMI) is minimized. Secondly, try to reduce electrical noise between layers and improve signal integrity through reasonable wiring and shielding techniques. For multilayer boards, the thickness of the insulating material between layers needs to be very precise to avoid signal crosstalk and performance issues caused by thermal expansion.

Thermal management

Heat dissipation issues are particularly prominent in ultra-thin PCB designs. As the sheet becomes thinner, it becomes more difficult to dissipate heat. Improper heat dissipation may cause the circuit to overheat, affecting the performance and life of the device. To effectively manage heat, there are several methods you can use:

Thermal Vias:By adding thermal vias in high-heat areas, heat can be quickly transferred to the heat dissipation layer.

Copper foil thickness: Use thicker copper foil in critical areas to increase heat transfer efficiency.

Heat sinks and thermal conductive materials: Add heat sinks or thermal conductive materials where needed to enhance heat dissipation.

Optimize layout:Arrange the heating components reasonably to avoid concentrating too many high-heat areas together, and ensure there is enough cooling space around them.

In addition to the above methods, designers should also consider thermal management solutions for the entire system, incorporating external cooling devices such as fans or radiators to improve overall heat dissipation efficiency.

Signal integrity

In ultra-thin PCBs, signal transmission paths are shorter and signal rates are higher due to reduced board thickness, making signal integrity an important aspect of design. Designers need to pay special attention to issues such as impedance control, reflections, and crosstalk. Proper wiring strategies, terminal matching, and the use of shielding are effective ways to solve these problems.

Mechanical strength

Although the design goal of ultra-thin PCBs is to reduce thickness, mechanical strength cannot be compromised. Thin sheets may increase flexibility but are also more susceptible to mechanical stress. Therefore, when designing, the mechanical stress and deformation of PCB in practical applications must be taken into consideration, and appropriate reinforcement materials or support structures must be designed.

By comprehensively considering material selection, stack-up structure, heat dissipation management and signal integrity, a high-performance, reliable ultra-thin PCB is designed to meet the lightweight and high-density needs of modern electronic equipment. Designers need to constantly optimize design methods and incorporate the latest materials and technologies in order to gain an advantage in the fierce market competition.

What material is used in Ultrathin PCB?

Due to its special application requirements, ultra-thin PCB (Printed Circuit Board) usually uses high-performance materials to ensure that it can still have excellent electrical and mechanical properties even at extremely thin thickness. Here are some common ultra-thin PCB materials and their characteristics:


FR-4 is an epoxy resin substrate reinforced with glass fiber and is one of the most commonly used PCB materials. It has the following characteristics:

High mechanical strength:The fiberglass-reinforced properties of FR-4 material give it excellent mechanical strength, allowing it to maintain structural integrity at extremely thin thicknesses and not easily bend or crack.

Excellent electrical performance:FR-4 has good insulation properties and stable dielectric constant, ensuring that the circuit board can operate reliably in various electrical environments.

Heat resistance:FR-4 material can withstand higher temperatures and is suitable for use in electronic equipment that requires high-temperature operation.

Cost-effectiveness:As a common PCB material, FR-4 has a mature production process and relatively low cost, making it an economical and practical choice.

Polyimide (PI)

Polyimide materials are widely used in flexible PCBs and ultra-thin PCBs mainly because of their following advantages:

Excellent heat resistance:Polyimide materials are stable at extremely high temperatures, often withstanding temperatures in excess of 300°C, making them ideal for high-temperature applications.

Excellent flexibility:Polyimide material is soft and resistant to bending, making it ideal for flexible circuit boards that require frequent bending or folding.

Good electrical performance:Polyimide material has excellent electrical insulation properties and low dielectric loss, ensuring the stability and reliability of signal transmission.

Chemical stability:The material has good resistance to most chemicals and can be used in harsh chemical environments.

Copper foil

Copper foil is the conductive layer material of PCB. Ultra-thin PCB usually uses high-quality copper foil to ensure reliable conductivity even at extremely thin thickness. Key features of copper foil include:

High conductivity:Copper has excellent electrical conductivity properties, ensuring that current can be transmitted efficiently and reducing power loss.

Corrosion resistance:After special treatment, copper foil has good corrosion resistance and can be used in harsh environments for a long time.

Processability:Copper foil is easy to etch and process, and can realize complex circuit patterns. The high-precision etching process allows ultra-thin PCB to meet the needs of precision electronic equipment.

High performance resin

In order to enhance the performance of ultra-thin PCBs, some special high-performance resin materials are also used. These resin materials have good adhesion and environmental resistance, which can further improve the mechanical strength and durability of PCB.

The material selection of ultra-thin PCB is crucial and directly affects its performance and application range. FR-4, polyimide (PI) and high-quality copper foil are currently the most commonly used materials. Their respective excellent properties ensure that ultra-thin PCBs can function in a variety of complex applications. The combination of these materials not only ensures the reliability and stability of the circuit board, but also meets the dual needs of modern electronic products for thinness and high performance. In the future, with the advancement of material science, ultra-thin PCB materials will continue to improve and innovate, providing stronger support for the development of electronic technology.

What size are Ultrathin PCB?

The dimensions of ultra-thin PCBs can be customized according to specific application requirements. Common thickness ranges from 0.1 mm to 0.4 mm, and the specific size depends on the design requirements of the device and the use environment. In practical applications, the size of ultra-thin PCB not only affects the overall performance of the device, but also has an important impact on the manufacturing process and cost.


The thickness of an ultra-thin PCB is one of its most notable features. The thickness of standard PCBs is usually around 1.6 mm, while the thickness of ultra-thin PCBs is significantly reduced, usually between 0.1 mm and 0.4 mm. This thickness gives ultra-thin PCBs significant advantages in lightweight and compact designs. For some extreme applications, the thickness of ultra-thin PCB can even be further reduced to 0.05 mm to meet special needs.

Length and width

The length and width of ultra-thin PCBs can be flexibly customized according to specific applications. For consumer electronics such as smartphones and tablets, ultra-thin PCBs are often smaller in size to fit into the compact space layout inside the device. In contrast, ultra-thin PCBs in medical devices and aerospace systems may require larger sizes to cover more functional modules and connection points.

Number of layers

Although ultra-thin PCB is characterized by its smaller thickness, this does not mean that it can only be a single-layer structure. In fact, ultra-thin PCBs can be designed as multi-layer boards to increase circuit complexity and functionality. Multi-layer ultra-thin PCB achieves signal transmission and power distribution through inter-layer connections (VIA), and despite the increase in the number of layers, the total thickness remains within a low range. For example, the thickness of a three- or four-layer ultra-thin PCB can be controlled within 0.3 mm.

Flexibility and rigidity

Depending on application requirements, ultra-thin PCBs can be divided into two types: flexible and rigid. Flexible ultra-thin PCB (FPC) is usually around 0.1 mm thick due to its material properties, making it ideal for use in wearable devices and other applications that require bending and folding. Rigid ultra-thin PCBs are suitable for applications that require stable support, such as camera modules and high-density connectors. The combined use of flexible and rigid ultra-thin PCBs (R-FPC) is increasingly common in modern electronic devices, providing design flexibility while ensuring structural strength.

Accuracy requirements

In the manufacturing process of ultra-thin PCBs, dimensional accuracy is a key factor. Due to the small thickness of ultra-thin PCBs, any small dimensional errors can have a significant impact on electrical performance. Therefore, during the manufacturing process, dimensional tolerances must be strictly controlled, usually within ±0.02 mm. In addition, in order to ensure the alignment accuracy of multi-layer ultra-thin PCBs, high-precision lamination and drilling equipment is required to ensure precise alignment between layers.

Specific application examples can better demonstrate the importance of ultra-thin PCB size. For example, in smartphones, ultra-thin PCBs are used for motherboards, camera modules, fingerprint recognition modules, etc. These components are usually very small in size, with a thickness of about 0.2 mm. In medical devices, such as portable electrocardiographs and insulin pumps, the size of ultra-thin PCBs is customized according to the device design to ensure complex functions can be implemented in a compact space.

The size design of ultra-thin PCB must not only take into account the physical space limitations of the device, but also take into account the electrical performance, manufacturing process and application environment. Through reasonable selection of thickness, length, width and number of layers, as well as strict control of manufacturing accuracy, ultra-thin PCBs can meet the needs of various complex applications and play a key role in modern electronic devices.

The Manufacturer Process of Ultrathin PCB.

The manufacturing process of ultra-thin PCBs requires a series of precise and complex steps to ensure that the final product is of high quality and reliability. The following is the detailed process for manufacturing ultra-thin PCB:

Design and layout

First, engineers use specialized design software to design and lay out the circuit. During the design process, they take into account the functional, size and performance needs of the circuit, as well as the special requirements of ultra-thin PCBs.

Material preparation

Before manufacturing ultra-thin PCBs, appropriate substrates and conductive layers need to be selected and prepared. Common substrates include FR-4 and polyimide (PI), while the conductive layer usually uses copper foil.

Graphics transfer

The designed circuit pattern is transferred to the substrate through the photolithography process. This step involves using photoresist and photomasks to precisely transfer the designed circuit pattern to the substrate surface.


After completing the pattern transfer, the next step is the etching step. Chemicals are used to remove unnecessary copper layers, allowing the designed circuit pattern to be revealed. This step requires highly precise control to ensure the accuracy and clarity of the circuit graphics.

Lamination and drilling

For multi-layer ultra-thin PCBs, a lamination process is required. This means that different circuit layers are stacked together according to the design and pressed using high temperature and pressure to form a complete circuit board structure. Subsequently, precision drilling is performed to ensure electrical connections between the different layers.

Surface treatment

After manufacturing, the circuit board needs to be surface treated to enhance its performance and durability. Common surface treatments include tin or gold plating to prevent oxidation of the copper layer and improve soldering performance.

Testing and Inspection

Finally, product quality is ensured through electrical testing and physical inspection. Electrical testing is used to verify circuit connectivity and performance, while physical inspection includes visual inspection and dimensional measurements to ensure the ultra-thin PCB meets specifications.

Through the above steps, ultra-thin PCBs can be accurately manufactured to meet the needs of various electronic devices for thinness, lightness, and high performance. This manufacturing process requires high precision and high technology support, but it also provides a solid foundation for the development of modern electronic technology.

The Application area of Ultrathin PCB.

As a key technology, ultra-thin PCB has shown wide application in many fields. Its thin, light and compact features make it the first choice in various electronic devices. Here are some of the main areas:

Consumer Electronics

Ultra-thin PCBs are widely used in the field of consumer electronics. High-tech products such as smartphones, tablets, and wearable devices are increasingly demanding thinner and lighter products. Ultra-thin PCBs can meet this demand and make devices lighter and more portable while maintaining high performance.

Medical equipment

In the medical field, ultra-thin PCB applications are also very common. For example, heart monitors, portable diagnostic equipment, etc. need to be small and lightweight so that medical staff can easily carry and use them. The design of ultra-thin PCB makes these medical devices not only more portable, but also able to maintain stable electrical performance and ensure accurate medical data.


The aerospace field has extremely strict weight requirements, and ultra-thin PCB meets this requirement. In aerospace electronic systems, ultra-thin PCBs can provide lightweight solutions, helping to reduce the overall weight of the aircraft while ensuring system reliability and performance.

Vehicle electronics

In the automotive industry, ultra-thin PCBs also play an important role. In automotive products that require high-performance electronic components, such as advanced driver assistance systems (ADAS) and in-vehicle entertainment systems, ultra-thin PCBs can provide compact solutions, help realize more advanced automotive technologies, and enhance the driving experience.

In general, the application of ultra-thin PCBs in these fields not only promotes technological innovation and performance improvement of related products, but also brings a more convenient and comfortable experience to users. With the continuous advancement of technology and the expansion of application scope, ultra-thin PCB will continue to play an important role in various fields and promote the continued development and innovation of the electronics industry.

What are the advantages of Ultrathin PCB?

The advantage of ultra-thin PCB lies not only in its thin appearance, but also in the multiple benefits it brings in the electronic field. The following are the main advantages of ultra-thin PCBs:

Reduce weight

Lightweighting electronic equipment has always been one of the goals pursued by the industry. The use of ultra-thin PCB can effectively reduce the overall weight, which is crucial especially for portable devices. Compared with traditional thick circuit boards, ultra-thin PCBs can make devices lighter and easier to carry, thereby improving user experience.

Save space

Modern electronic devices often require the integration of more functions and components within limited space. Ultra-thin PCB is suitable for high-density integration due to its small size and can accommodate more electronic components in a limited space. This high level of integration not only improves device performance, but also helps simplify design and reduce costs.

Flexible design

The flexibility of ultra-thin PCB makes it especially suitable for flexible and wearable devices. Compared with traditional rigid PCBs, ultra-thin PCBs can better adapt to curved surface designs and can be combined with flexible electronic components to achieve more flexible and diverse product designs. This flexibility opens up more possibilities for innovation and individual design.

High performance

Although the thickness of ultra-thin PCB is reduced, its electrical performance and reliability are not significantly affected. By optimizing the design and selecting high-performance materials, ultra-thin PCBs can maintain good signal integrity, thermal management capabilities and interference resistance, ensuring high performance and stable operation of the device.

To sum up, ultra-thin PCB has obvious advantages in lightweight, high integration, flexible design and high performance, providing strong support for the development of modern electronic products. With the continuous advancement of technology and the continuous expansion of application fields, ultra-thin PCB will continue to play an important role in promoting innovation and development in the electronic field.


What is the minimum thickness of ultra-thin PCB?

The minimum thickness of ultra-thin PCB is usually around 0.1mm, but it depends on the manufacturing process and application requirements. With the continuous advancement of technology, some advanced manufacturing technologies can even achieve smaller-sized ultra-thin PCBs, providing greater flexibility in device design.

What is the cost of ultra-thin PCB?

Ultra-thin PCBs are relatively expensive because they require high-precision manufacturing and special materials. Compared with traditional PCBs, the manufacturing process of ultra-thin PCBs is more complex and requires higher technology and equipment investment. However, as technology continues to mature and production scale expands, the cost of ultra-thin PCBs is gradually reduced, making them more competitive.

Are ultra-thin PCBs easily damaged?

Ultra-thin PCBs are thinner than traditional PCBs and therefore more susceptible to damage when subjected to mechanical stress or external impact. However, this risk can be effectively reduced through proper design and material selection. For example, using flexible substrates and appropriate support structures can improve the durability and toughness of ultra-thin PCBs, thereby reducing the likelihood of damage.

What types of equipment are ultra-thin PCBs suitable for?

Ultra-thin PCB is suitable for various electronic devices that require thin, light and compact design, including but not limited to smartphones, tablets, wearable devices, medical equipment, aerospace equipment and automotive electronics. Its excellent performance and compact size make it an ideal choice in the design of modern electronic devices.

What about thermal management for ultra-thin PCBs?

Since the design of ultra-thin PCBs often limits heat dissipation capabilities, thermal management is an important consideration. When designing ultra-thin PCBs, effective heat dissipation solutions, such as cooling pads, heat sinks, or adding vents, are needed to ensure the stability and reliability of electronic devices. In addition, selecting the appropriate materials and stack-up structure can also improve the heat dissipation performance of ultra-thin PCBs.



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