Why Ceramic Capacitor Are More Popular Than Others?

By Author: Rachel Anne
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Ceramic Capacitor Basics

What is a Ceramic Capacitor?

The capacitor value is unchangeable. The working ceramic material acts as the dielectric, and it is a ceramic capacitor constructed of two or more alternating layers of ceramic and it has a metal layer acting as the electrodes, and the composition of the ceramic material defines the electrical behavior and thus applications.

Ceramic Capacitor Polarity and Symbol

Ceramic capacitors are the most common type of capacitor found in all electrical devices, and they use a ceramic material as the dielectric. Ceramic capacitors are non-polarity devices, which means they have no polarities. As a result, we can connect it to a circuit board in any direction.

As a result, they are far safer than electrolytic capacitors. The symbol for a non-polarised capacitor is shown below. Many capacitors, such as tantalum beads, do not have polarity.

Types and Properties of Ceramic Capacitors

Ceramic capacitors come in three varieties, though other styles are available:

Resin-coated leaded disc ceramic capacitors ...
... for through-hole mounting.
Multi-Layer Ceramic Capacitors with Surface Mount (MLCC).
Microwave bare lead-free disc ceramic capacitors that are designed to fit into a PCB slot.Ceramic disc capacitors

Ceramic disc capacitors are made by coating a ceramic disc on both sides with silver contacts. These devices can be made from multiple layers to achieve higher capacitances. Ceramic disc capacitors are typically through-hole components that are dwindling in popularity due to their size. If capacitance values allow, MLCCs are used instead. Ceramic disc capacitors have capacitance values ranging from 10pF to 100F and voltage ratings ranging from 16 volts to 15 kV and higher.

Multi-layer ceramic capacitor (MLCC)

MLCCs are fabricated by precisely combining finely ground granules of paraelectric and ferroelectric materials and then layering the mixture with metal contacts. Following the completion of the layering, the device is heated to a high temperature and the mixture is sintered, resulting in a ceramic material with the desired properties. The resulting capacitor is essentially made up of many smaller capacitors connected in parallel to increase the capacitance. MLCCs have 500 layers or more, with a minimum layer thickness of about 0.5 microns. As technology advances, layer thickness decreases, and higher capacitances for the same volume are achieved.

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