1. The material of high-voltage smd capacitor
High-voltage smd capacitor are widely used in some smart products and communication fields. This high-voltage capacitor is distinguished by material
If it is, it can generally be divided into three categories, namely high-dielectric constant type X7R medium, semiconductor type X5R medium and temperature-compensated NPO medium.
Today we will introduce these high-voltage stickers using different materials for new engineers who are just beginning to contact the electronic design industry.
What are the differences between smd capacitor.
The first thing I want to introduce is the high dielectric constant type X7R dielectric high-voltage smd capacitor. The name of this high-voltage capacitor is a bit long.
There is also some awkwardness, so in ordinary applications, most engineers often refer to it as X7R for short. This kind called X7R is a kind of strong current
It is possible to manufacture high-voltage capacitor with a larger capacity than NPO dielectrics.
In practical applications, the performance of this high-voltage capacitor is relatively stable, and in the process of temperature, voltage and time changes, its unique
The performance change is not significant, it is a type of stable capacitor material, so it is often used in blocking, coupling, bypass, filter circuit and reliable
In high-frequency circuits with high performance requirements.
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2. Talking about the classification and performance parameters of high-voltage smd capacitor
Mounted high-voltage smd capacitor, also known as ceramic multilayer smd capacitor, can be regarded as a production process using ceramic powder, and the inside is precious metal palladium
Gold structure, it is made by high-temperature sintering method to plate silver on ceramics as electrodes. Products are divided into high-frequency porcelain NP0 (COG) and low-frequency porcelain
Introduce two materials of X7R. NP0 is known for its small size. It has only a small package volume. It is a capacitor with high temperature coefficient and good high frequency performance.
Characteristic, so NP0 is almost used in high-stability oscillating circuit, thus as a circuit filter capacitor. X7R ceramic capacitor are limited to normal frequency
For bypass or DC blocking in high-speed circuits, or where stability and loss requirements are not high, this type of capacitor is not suitable for use in alternating current (AC)
In pulse circuits, because they are prone to breakdown by pulse voltage, they are not intended to be used in AC circuits.
Temperature compensation type: NP0 quality NP0, also known as COG, the most stable electrical performance, basically does not change with temperature, voltage, and time, which is ultra-stable
Type, low-loss capacitor material type, suitable for high-frequency, UHF, and VHF circuits that require high stability and reliability.
High-dielectric constant type X7R dielectric: X7R is a ferroelectric, so capacitor with a larger capacity than NPO dielectrics can be manufactured. This kind of electricity
The performance of the container is relatively stable. With the change of temperature, voltage and time, its unique performance changes are not significant. It is a type of stable capacitor material.
In dc blocking, coupling, bypass, filter circuits and medium and high frequency circuits with high reliability requirements.
Semiconductor type X5R dielectric: X5R has a high dielectric constant, and is often used to produce large-capacity capacitor with large specific capacitance and high nominal capacity
product. But its capacity stability is better than X7R, capacity, loss is more sensitive to temperature, voltage and other test conditions, mainly used in the vibration of electronic equipment
Oscillating, coupling, filtering and side-by-side circuits.
Advantages: small package size, stable quality, high insulation performance, high voltage resistance.
Disadvantages: small capacity, currently the largest UF, easy to be broken down by pulse voltage.