Surface mout ceramic capacitor (multilayer ceramic capacitor, MLCC) is an electronic component with a multilayer ceramic structure. Its basic structure is to stack ceramic dielectric diaphragms with printed electrodes in an interlaced manner, and form a ceramic core through a one-time high-temperature sintering, and then coat metal layers (external electrodes) at both ends of the core to form a structure similar to a monolith.
It has the advantages of small size, low cost, and stable performance, and is an indispensable and important part of the electronics industry. Understanding the working principle, application field, and development trend of Surface mout ceramic capacitor can give us a basic understanding of it
1. Working principle of surface mout ceramic capacitor
The working principle is based on the basic principle of capacitor, which is to store charge by sandwiching a layer of insulating material (dielectric) between two conductors. The detailed introduction of the working principle of surface mout ceramic capacitor is as follows:
① Structural composition
· Surface mout ceramic capacitor consists of multiple layers of ceramic dielectric and alternating metal electrodes. These metal electrodes are usually made of metals such as silver, palladium, nickel or copper and printed on ceramic dielectric
· Ceramic dielectric has a high dielectric constant, which means it can store more charge in a smaller volume
② Charge storage
· When voltage is applied to the two external electrodes of MLCC, the molecules in the dielectric are polarized. This means that the positive and negative charges in the dielectric molecules move in opposite directions, forming an internal electric field
· The internal electric field causes positive and negative charges to accumulate on the two external electrodes of the capacitor, forming a charge distribution. This charge distribution is the basis for the capacitor to store charge
③ Charge release
· When the external voltage is removed, the charge in the surface mout ceramic capacitor does not disappear immediately, but remains for a period of time. This is caused by the physical changes that occur in the dielectric molecules during the polarization process, and these changes take some time to recover.
· If the capacitor is connected to a circuit at this time, the charge in the capacitor will be released through the circuit, providing the required current to the circuit.
④ Capacitance value
· The capacitance value of an SMD ceramic capacitor depends on its physical size, the dielectric constant of the ceramic medium, and the geometry of the metal electrodes.
· Generally speaking, the larger the capacitance value of a capacitor, the more charge it can store.
⑤ Frequency response
· SMD ceramic capacitors have a good response to high-frequency models, making them ideal for wireless communications and RF fields.
· In high-frequency circuits, capacitors can smooth voltage fluctuations, provide a stable current source, and reduce signal loss.
The working principle of the surface mout ceramic capacitor can be summarized as follows:
When voltage is applied to the two conductors of the ceramic patch, the molecules in the dielectric will be polarized, forming an electric field. This electric field causes positive and negative charges to accumulate on the two conductors of the capacitor, forming a charge distribution. In general, it stores charge and releases it when needed to smooth the voltage in the circuit.
2. Application fields of surface mout ceramic capacitor
Surface mout ceramic capacitor has a wide range of applications in the electronics industry, covering a variety of high-performance, high-stability electronic devices and systems. Its main application areas include:
① Communication equipment
In communication devices such as mobile phones, laptops, tablets, etc., MLCC is widely used in power management, signal filtering, voltage stabilization, etc. due to its miniaturization, large capacity and high precision. They ensure the stable operation of communication equipment in various complex environments
② Imaging equipment
In imaging equipment such as digital cameras and camcorders, the high reliability and stability of ceramic chip capacitors ensure the accuracy and durability of image processing. Under high-performance requirements such as high-definition video recording and high-speed continuous shooting, capacitors can provide stable power supply and signal filtering support
③ Wireless devices
In wireless devices such as W-LAN/Bluetooth, the excellent frequency characteristics and lead-free environmental protection characteristics of surface mout ceramic capacitors make it an ideal choice. They help improve the signal transmission efficiency and stability of wireless devices, ensuring that users can enjoy a smooth network experience
④ Monitoring equipment
High precision and low residual inductance ensure the stable operation of monitoring equipment. Ceramic chip capacitors play a key role in filtering and stabilizing voltage in monitoring equipment, ensuring the clarity and stability of image transmission
⑤ Network equipment
During data transmission and exchange, the low distributed capacitance and low ESR characteristics of ceramic chip capacitors ensure efficient signal transmission. They play an important role in filtering and decoupling in network equipment, improving the performance and stability of network equipment
⑥ Industrial equipment
In high-end industrial equipment such as automation control equipment and medical equipment, the stability and reliability of ceramic chip capacitors have been fully verified. They are widely used in various control systems and instruments to ensure the precise control and stable operation of equipment
⑦ Automotive electronics
With the rapid development of new energy vehicles, the performance requirements for electronic components are getting higher and higher. The high temperature and low temperature resistance and long life of ceramic chip capacitors make them an ideal choice for automotive electronic systems. They are widely used in power management, signal filtering, etc., ensuring the reliable operation of automotive electronic equipment
⑧ New energy
In the field of new energy such as solar energy and wind energy, ceramic chip capacitors also play an important role. They are used in power management, signal filtering, etc., improving the efficiency and stability of new energy systems
3. Precautions for using surface mout ceramic capacitors:
To ensure the best performance and long-term reliability of MLCC in the circuit, the following key aspects need to be noted
① Select the appropriate capacitor model and specifications
Based on the circuit's operating voltage, current, frequency, and operating ambient temperature requirements, select a capacitor with appropriate rated voltage, capacity, and temperature characteristics. Pay special attention to the rated voltage of the surface mout ceramic capacitor should be higher than the maximum working voltage in the circuit to ensure that the capacitor will not be damaged by overvoltage.
② Avoid overcurrent and overvoltage. Although the surface mout ceramic capacitor has a high current carrying capacity, it is still necessary to avoid excessive current shock in actual applications. Once the current is too large, the internal heat of the capacitor may be generated, which will lead to performance degradation or failure. Excessive voltage may also cause the capacitor to break down and cause a short circuit. Therefore, when designing the circuit, it should be ensured that the capacitor can withstand the maximum current and voltage in the circuit.
③ Pay attention to the influence of stability and humidity. The performance of the capacitor is greatly affected by temperature and humidity. Excessive temperature may cause the internal material of the capacitor to age, reducing its capacity and stability.
④ Correct installation and welding. During installation, ensure good contact between the capacitor and the circuit board to avoid excessive mechanical stress during installation.
When welding, choose the appropriate welding process and solder, control the welding temperature and welding time, and avoid thermal damage to the capacitor. At the same time, during the welding process, appropriate flux should be used, and the amount of flux should be controlled to avoid excessive residue on the surface of the capacitor.
⑤ Pay attention to the storage and preservation of capacitors
Make sure to place the capacitor in a dry, ventilated, non-corrosive gas environment, and avoid long-term exposure to high temperature, high humidity or direct sunlight.
In addition, the welding characteristics of the capacitor will deteriorate over time, so it should be used up as soon as possible. If it needs to be stored for a long time, you can consult the capacitor manufacturer for more advice.
⑥ Regular inspection and maintenance
In order to ensure the long-term stability and reliability of the surface mout ceramic capacitor, the capacitor needs to be inspected and maintained regularly. By detecting the capacitance and loss tangent parameters of the capacitor, changes in the performance of the capacitor can be discovered in time and corresponding maintenance measures can be taken. At the same time, it is also necessary to regularly check whether the working environment of the capacitor meets the requirements so that the working environment conditions can be adjusted in time.
4.Surface mout ceramic capacitor manufacturer
①Murata
A well-known company in the electronic components industry, the capacitors produced are known for their high quality and reliability. They provide ceramic chip capacitors in a variety of sizes and specifications. They continue to invest in research and development to promote continuous innovation in capacitor technology. Products are widely used in automobiles, communications, consumer electronics and other fields
②TDK
With profound technical accumulation in the field of materials science, its surface mout ceramic capacitor
Made of high-performance materials, it has excellent electrical performance and stability. TDK uses advanced manufacturing processes to ensure the accuracy and consistency of capacitors
③Yageo
It has profound technical strength in the field of capacitors, and its products perform well in terms of accuracy, stability and reliability. Yageo achieves cost advantages by optimizing production processes and supply chain management, providing customers with more competitive prices
④Taiyo Yuden
A manufacturer with significant influence in the field of electronic components, its products maintain high performance while being small in size, and are suitable for high-density electronic component integration. Its products also have excellent performance in high-frequency characteristics and temperature stability
⑤KYOCERA AVX
AVX was originally a US company specializing in the design, development, production and sales of passive electronic components and interconnect products. Later, Kyocera Japan officially issued a comprehensive acquisition offer to the board of directors of its joint-stock company VX Corporation. It currently holds 72% of the outstanding shares of AVX and plans to acquire the remaining shares to achieve 100% control.
KYOCERA AVX's ceramic chip capacitors are famous for their high quality and high performance. The products have the characteristics of high precision, high stability and high reliability, and can meet the needs of various complex application environments.
⑥Samsung
It is a well-known electronics industry manufacturer in South Korea. Its products have the characteristics of high reliability, high precision and high stability, outstanding in quality and performance, and are widely used in various electronic equipment.
One River Electronics Ltd. is an electronic component distributor with more than ten years of experience and can provide a variety of original surface mout ceramic capacitors. Ready stock, complete models, and can be shipped as soon as the same day. Contact [email protected] get a quote
