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Knowledge Base

Choosing PCB Plates: Things You Need to Know

In the selection of PCB (printed circuit board), it is especially necessary to pay attention to the PCB plates, because the choice of plate is crucial to the stability, durability, and use experience of the product. For many electronic devices, PCB plates are both the basis for structural support and part of ensuring electrical performance. Whether in mechanical keyboards, industrial electronic equipment or daily consumer electronics, different application scenarios have different needs for the performance, weight, flexibility ,and pressure resistance of plates; and the choice of the plate is directly related to the overall quality and service life of the product. So, in this paper, we conduct an in-depth discussion on PCB plates, including the common materials of PCB plates and their application in different fields. We hope this article will help you choose the right PCB plate.

 



What is a PCB Plate?

 

A PCB plate is a hard or semi-hard layer placed on the printed circuit board, which is an additional support layer on the circuit board to increase the stability of the circuit board and provide support. In electronic devices, PCB plates can help fix components and reduce bending or deformation of the circuit board. For example, in a mechanical keyboard, the PCB plate aligns the switch and prevents the PCB from bending during use, improving the durability of the keyboard and the typing experience.

 

Key Functions of PCB Plate

 

1. Structural support

 

The primary function of a PCB plate is to provide additional structural support for the circuit board and increase the overall stability of the equipment; In larger or frequently operated equipment, PCB boards can maintain the stability of components and reduce the bending or deformation of the PCB itself. For example, in heavy industrial equipment, PCB plates provide strong structural support, so that PCB plates can be used for a long time without deformation due to vibration or mechanical stress. (The plates buffer the vibration of the equipment and reduce damage caused by harsh environments or high-intensity use.)

 

2. Enhance durability

 

The PCB plate enhances the durability of the PCB and the components on it: by providing a strong support surface, dispersing the physical stress and reducing stress concentration at the PCB and component joints (especially in solder joints and tight joint areas). For example, some solder joints will break due to too long use time, resulting in equipment failure. But if there is a plate to provide support, the PCB plate will reduce the pressure on the solder joints, and evenly distribute the pressure, thus effectively protecting these critical connections. This function of the PCB plate extends the service life of the circuit board and components, which is particularly important for electronic products with high-reliability requirements, such as communication equipment and medical equipment.

 

3. Improve typing experience (mainly for mechanical keyboards)

 



In the field of mechanical keyboards, the choice of PCB plate is very important, because it has a direct impact on the feel and sound performance of typing; the typing experience of mechanical keyboards made of different materials is different. For example, keyboards made of aluminum and brass sheets often have a crisper sound; while polycarbonate and FR4 keyboards have a softer, deeper tone. You can choose according to your preferences. The PCB plate also increases the stability of the key position and prevents the key from shaking during typing, which improves the user's typing accuracy and brings a more comfortable typing experience.

 

Common Materials for PCB Plates

 

Material

Description

Advantages

Disadvantages

Typical Applications

Aluminum Plate

high rigidity;

moderate weight

durable; 

easy to process;

crisp sound

hard;

lacks flexibility

mechanical keyboards; 

consumer electronics;

industrial equipment

Polycarbonate Plate

lightweight;

high flexibility

soft feel;

low noise

low rigidity;

not suitable for high-support needs

custom mechanical keyboards

Brass Plate

heavy;

high rigidity

unique feel;

crisp sound

prone to oxidation;

requires maintenance;

high cost

high-end mechanical keyboards

Carbon Fiber Plate

lightweight;

high rigidity;

moderate flexibility

lightweight;

durable;

soft sound

high cost; 

difficult to process

high-end custom keyboards;

portable electronic devices

FR4 (Fiber Reinforced)

low cost;

good durability;

moderate flexibility

high cost-effectiveness;

moderate rigidity and flexibility

less rigid than metal plates

custom keyboards;

consumer electronics

Silicon Nitride

high strength;

high insulation;

heat-resistant

excellent heat resistance and insulation

high cost;

insufficient rigidity

high-performance circuits;

industrial electronics;

high-temperature environments

 

Applications of PCB Plates

 

PCB plates have a wide range of applications in electronic equipment, in addition to the mechanical keyboard, industrial electronic equipment, consumer electronics and medical equipment already mentioned above; There are also PCB plates in automotive electronics, aerospace electronics, communication equipment, smart home equipment, etc.

 



PCB-Mounted vs. Plate-Mounted Keyboards

 

Comparison

PCB-Mounted Keyboards

Plate-Mounted Keyboards

Structural Features

Switches are directly soldered onto the PCB without an additional support plate, resulting in a lighter structure.

Switches are mounted on a separate support plate (usually metal or plastic) which is then attached to the PCB, creating a more robust structure.

Typing Feel

Softer feel with some flexibility;

suitable for long typing sessions.

Harder, more rigid feel, providing stable feedback; 

ideal for users who prefer a firm typing experience.

Sound Profile

Quieter and softer sound; 

suitable for low-noise environments.

Crisp and bright sound;

with the sound effect influenced by the plate material; different materials provide varied acoustic effects.

Structural Stability

Lower stability;

switches may experience slight wobble.

High stability;

as the support plate provides extra fixation points, effectively reducing switch wobble.

Advantages

Lightweight keyboard, easy to install and maintain;

lower cost, Softer typing feel;

ideal for prolonged use.

Offers high stability;

reduces wobble.

Crisp, loud sound with a firm feel. Diverse support plate materials offer a unique feel and sound.

Disadvantages

Lower stability may impact PCB lifespan over time;

Not suitable for those who prefer a firm typing experience.

More complex structure;

weight and thickness adding;

higher installation cost;

more challenging to maintain;

firmer typing feel;

tailored to specific user preferences.

Recommended Use

Users who prefer a lightweight design, softer feel, and quieter typing experience.

Users who need high stability, clear sound, and a firm typing feel, especially in larger keyboards or high-frequency use cases.

 

Types of PCBs Used with Plates in Keyboards

 



PCB Type

Features

Suitable Applications

Pros

Cons

Standard PCB

Stable structure;

supports soldered switches;

suitable for most keyboard uses.

Keyboards with high durability requirements, like office or programming keyboards

High compatibility, stability

Requires soldering;

less flexibility

Hot-Swap PCB

Equipped with hot-swap sockets, allowing switches to be replaced without soldering

Keyboard enthusiasts and custom users who frequently switch switches

No soldering required;

high flexibility

Limited socket durability

Flex-Cut PCB

Special cut design adds flexibility, providing a softer typing feel

Keyboard users seeking a softer, more elastic typing feel

Enhanced elastic feel

Lower structural strength

Multi-Layer PCB

Multi-layer circuit design supports RGB lighting and programming functions

High-end keyboards need RGB lighting and programmable keys

Powerful functionality

Higher cost;

complex design

Flexible PCB

Highly flexible, can bend;

suitable for lightweight or special designs

Lightweight office keyboards;

foldable keyboards, and unique designs

Lightweight and flexible

Relatively lower stability

 

Choosing Suitable PCB Plates

 

PCB plates can provide structural support for your electronic equipment, enhance the service life of the product, and help fix the components on the PCB board. In the selection of PCB board, the material used, installation and application needs should be taken into account; Different materials and installation methods can affect the durability, stability and use experience of the product. And for the choice of PCB plates for a mechanical keyboard, it is also necessary to consider the material it uses, of course, the most important thing is your preferences. I hope that through the introduction of this article, you can better understand the function and application of PCB plates, so as to choose the PCB plate that suits your needs. If you have a need to assemble your PCBs or want to buy PCB plates, welcome to contact us. We will provide you with the best service!

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