What is the difference between a ceramic and electrolytic capacitor?
The main difference between ceramic and electrolytic capacitor is that, in ceramic capacitors, the two conductive plates are separated by a ceramic material whereas, in electrolytic capacitors, the two conductive plates are separated by an electrolyte and a metal oxide layer.
Can I use an electrolytic capacitor instead of ceramic?
For switching power supply applications, ceramics are usually a better tradeoff than electrolytes unless you need too much capacitance. This is because they can take much more ripple current and heat better. The lifetime of electrolytes is severely degraded by heat, which is often a problem with power supplies.
Why is ESR important in ceramic capacitor design?
ESR in Ceramic Capacitors Equivalent series resistance is one of the most important parameters to consider when selecting a ceramic capacitor for your electronic circuit. In ceramic capacitors, this parameter is a summation of losses occurring within the metallic elements and dielectric material.
When to use electrolytic capacitors for decoupling?
Here is a typical frequency response: You can see that the electrolytic capacitors have the worst performance. Generally they are used for decoupling at low frequencies (kHz range), i.e. They provide power until the supply can react. Usually, I try to avoid them, unless you need 100uF or more.
What do you need to know about ceramic capacitors?
Equivalent series resistance is one of the most important parameters to consider when selecting a ceramic capacitor for your electronic circuit. In ceramic capacitors, this parameter is a summation of losses occurring within the metallic elements and dielectric material. Many applications demand ceramic capacitors with low ESR.
How is ESR related to dielectric loss?
ESR shows a value equivalent to dielectric loss from delay of polarization in the dielectric substance. As the frequency rises, ESR resulting from parasitic inductance, electrode resistivity and other factors causes |Z| behavior to stray from that of an ideal capacitor (red broken line) and reach a minimum value.