SMD high voltage ceramic capacitor details

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Product parameter

Material: COG NPO X7R X5R Y5V

NPO (COG) material belongs to Class I high-frequency capacitor. Its capacitance is stable and does not change with environmental temperature, voltage and time changes. It is suitable for high-frequency electronic circuits.

The X5R/X7R material is a class II low-frequency capacitor, its capacitance is relatively stable, and it is relatively sensitive to changes in ambient temperature, voltage and time.

Y5V material belongs to class II low frequency capacitor, and its capacitance changes greatly due to the influence of environment, temperature, voltage and time.

Series: 0402, 0603, 0805, 1206, 1210, 1808, 1812, 2220, 2225;

Capacity: 0.2p-100uF 10V-5000V 0.2Pf--10Uf full range;

Deviation: A=±0.05pF, B=±0.1pF, C=±0.25pF, D=±0.5pF, F=±1%, G=±2%, J=±5%, K=±10%, M=±20%, Z=-20%+80%

common problem

As the capacitance value of MLCC continues to increase, the equipment used to measure capacitance in the past may not be able to provide accurate measurement of large capacitance components. In particular, the meter cannot drive enough AC voltage to measure the full capacitance. The following discussion contains answers to frequently asked questions and measurement tips for high-volume measurement of MLCC.

Q1. Why are the measured values smaller when measuring some large capacitance MLCCs?

A1. When measuring capacitor, it is important to understand the difference between the true value, the effective value and the indicated value. The true value is the value of the capacitor when it is an ideal component without parasitic inductance and resistance. The effective value is the sum of the actual (real part) and vector (imaginary part) of the component, and is related to the frequency. The indicated value is the value displayed by the measuring device and is subject to measurement accuracy.

When measuring large capacitance value capacitor, the voltage level (representation value) set on the meter is not equal to the voltage level (effective value) transmitted in the DUT (Device Under Test).

Q2. What voltage and frequency should be suitable for capacitor?

A2. MLCC capacitor> 10μF are regarded as large capacitance capacitor. Improvements in manufacturing technology have allowed ceramic capacitor manufacturers to produce high-capacity capacitor close to tantalum capacitor and aluminum electrolytic capacitor. The test specifications of these "large capacitance" MLCCs are tested under the same conditions as tantalum capacitor. The measuring voltage should be 0.5 Vrms and the measuring frequency should be 120Hz. The following table summarizes and describes the test conditions.

Capacitor AC voltage frequency

▲  Physical anatomy diagram

Applicable industry

Suitable for LED lighting related products, power products, household appliances, computer side office products, large industrial equipment controllers, network equipment, communication products, digital products, automotive electronics, security monitoring systems and other fields.