Ceramic capacitors – an ultimate guide

Ceramic Capacitors An Ultimate Guide

There are various types of capacitors. Capacitors can be divided into ceramic capacitors, tantalum electrolytic capacitors, aluminum electrolytic capacitors, etc. based on the production materials. In particular, multilayer ceramic capacitors are small in size but have large capacity, and are often used in various circuits such as decoupling, power supply voltage smoothing, and filtering. Recently, it has become an indispensable component to improve the performance of mobile phones and televisions. In this article, let us dive into ceramic capacitors.

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    What are ceramic capacitors?

    Ceramic Capacitors
    Ceramic Capacitors

    Ceramic capacitors are a type of electronic component used to store and release electrical energy in electronic circuits. They are widely used in a variety of applications due to their compact size, reliability, and cost-effectiveness. Ceramic capacitors are constructed using ceramic materials as the dielectric (the insulating material between the capacitor’s plates) and metal electrodes.

    Ceramic Capacitors Explained

    Common ceramic capacitors

    1. Semiconductor ceramic capacitor
    Semiconductor ceramic capacitors are divided into two types: surface type and grain boundary layer type. They usually have a large capacity, small size, and wide operating temperature range. They are suitable for filtering, bypassing, coupling and other circuits.

    A semiconductor ceramic capacitor is a kind of miniaturized capacitor, that is, the capacitor obtains the largest possible capacity in the smallest possible volume. This is also one of the development trends of capacitors. For separated capacitor components, there are two basic approaches to miniaturization: ① to increase the dielectric constant of the dielectric material as much as possible; ② to make the thickness of the dielectric layer as thin as possible.

    2. High-voltage ceramic capacitors
    With the rapid development of the electronics industry, there is an urgent need to develop high-voltage ceramic capacitors with high breakdown voltage, low loss, small size and high reliability. The typical function of high-voltage ceramic capacitors is to eliminate high-frequency interference. They are widely used in negative ion products, lasers, X-ray machines, control and measurement equipment, high-voltage packages, igniters, generators, transformers, power equipment, voltage doubler modules, welding machines, Electrostatic spraying and other electromechanical equipment requiring high voltage and high frequency.

    3. Multilayer chip ceramic capacitors
    Multilayer chip ceramic capacitors, also known as MLCC, are the most widely used type of chip components. They are composed of internal electrode materials and ceramic bodies that are alternately stacked in parallel in multiple layers. Combined and co-fired into a whole, it is also called a chip monolithic capacitor. It has the characteristics of small size, high specific volume and high precision. It can be mounted on printed circuit boards and hybrid integrated circuit substrates, effectively reducing the size of electronic information. The volume and weight of the end product are reduced, and product reliability is improved.

    9 functions of ceramic capacitors

    9 Functions of Ceramic Capacitors
    9 Functions of Ceramic Capacitors

    1. DC isolation: The function is to prevent DC from passing through and allow AC to pass through.

    2. Bypass (decoupling): Provides a low-impedance path for certain parallel components in the AC circuit.

    3. Coupling: As a connection between two circuits, allowing AC signals to pass through and be transmitted to the next level circuit

    4. Filtering: This is very important for DIY. The capacitors on the graphics card basically have this function.

    5. Temperature compensation: Compensate for the impact of other components’ insufficient adaptability to temperature to improve the stability of the circuit.

    6. Timing: Capacitors and resistors are used together to determine the time constant of the circuit.

    7. Tuning: System tuning of frequency-related circuits, such as mobile phones, radios, and televisions.

    8. Rectification: Turn on or off the semi-closed conductor switching element at a predetermined time.

    9. Energy storage: Stores electrical energy and releases it when necessary. Such as camera flash, heating equipment, etc.

    Advantages of ceramic capacitors

    1. The capacity loss of high-voltage ceramic capacitors has high stability with temperature and frequency.

    2. The special series structure of high-voltage ceramic capacitors is suitable for high-voltage and extremely long-term operating reliability.

    3、High-voltage ceramic capacitors have high current ramp rates and are suitable for non-inductive structures of large current loops.

    FAQ-about PCB

    Ceramic capacitors are a type of electronic component used to store and release electrical energy in electronic circuits. They are widely used in a variety of applications due to their compact size, reliability, and cost-effectiveness. Ceramic capacitors are constructed using ceramic materials as the dielectric (the insulating material between the capacitor’s plates) and metal electrodes.

    1. Semiconductor ceramic capacitor

    2. High-voltage ceramic capacitors

    3. Multilayer chip ceramic capacitors

    1. DC isolation

    2. Bypass (decoupling)

    3. Coupling

    4. Filtering

    5. Temperature compensation

    6. Timing

    7. Tuning

    8. Rectification

    9. Energy storage

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