Kemet Ceramic Capacitors Esr

4 min read Jun 26, 2024
Kemet Ceramic Capacitors Esr

Kemet Ceramic Capacitors ESR: Understanding the Importance of Equivalent Series Resistance


Ceramic capacitors are widely used in electronic circuits for their high reliability, low cost, and small size. Among the various types of ceramic capacitors, Kemet ceramic capacitors are known for their high quality and performance. However, like all capacitors, Kemet ceramic capacitors also have an Equivalent Series Resistance (ESR), which is a critical parameter affecting their performance. In this article, we will delve into the world of ESR and its significance in Kemet ceramic capacitors.

What is ESR?

Equivalent Series Resistance (ESR) is the total resistance of a capacitor, including the resistance of the leads, electrodes, and dielectric materials. It is a measure of the internal resistance of a capacitor to the flow of an AC current. ESR is typically represented by the symbol "R" and is measured in ohms (Ω).

Why is ESR Important?

ESR plays a critical role in the performance of ceramic capacitors, including Kemet ceramic capacitors. A high ESR can lead to:

  • Heat Generation: High ESR can cause the capacitor to heat up, leading to a reduction in its lifespan and overall performance.
  • Power Loss: ESR increases the power loss in a circuit, which can lead to energy inefficiency and reduced system reliability.
  • Signal Distortion: High ESR can cause signal distortion, affecting the overall signal integrity in the circuit.

Factors Affecting ESR in Kemet Ceramic Capacitors

Several factors can influence the ESR of Kemet ceramic capacitors, including:

  • Capacitor Size: Smaller capacitors tend to have higher ESR due to their smaller size and increased electrode resistance.
  • Dielectric Material: The type of dielectric material used in the capacitor can affect its ESR. For example, X7R and X5R dielectrics have higher ESR than C0G and NP0 dielectrics.
  • Frequency: ESR increases with frequency, making it a critical consideration in high-frequency applications.
  • Temperature: ESR can change with temperature, with higher temperatures often leading to increased ESR.

Applications of Kemet Ceramic Capacitors with Low ESR

Kemet ceramic capacitors with low ESR are suitable for a wide range of applications, including:

  • DC-DC Converters: Low ESR ceramic capacitors can reduce power loss and heat generation in DC-DC converters.
  • High-Frequency Circuits: Low ESR ceramic capacitors can minimize signal distortion and attenuation in high-frequency circuits.
  • Automotive Systems: Low ESR ceramic capacitors can improve the reliability and performance of automotive systems, such as engine control units and infotainment systems.


In conclusion, ESR is a critical parameter in Kemet ceramic capacitors, and understanding its importance is essential for optimal system design and performance. By selecting ceramic capacitors with low ESR and considering the factors that affect ESR, designers can create more efficient, reliable, and high-performance systems.