Capacitors Blog

Suntan Technology Company Limited
----All Kinds of Capacitors

Data shows that more and more people start using multi-layer ceramic capacitors/MLCC, and increasingly optimistic about their new circuit design applications. In the past five to ten years, MLCC and tantalum capacitor capacitance of unit volume has been increased 10 to 100 times as before, MLCC application areas have gradually expanded to previously dominated by the tantalum capacitor site. Currently, MLCC and tantalum capacitors is competing between 1.0 to 100uF market. Many circuit design found that the new generation of large capacitance MLCC can better meet their needs, and higher production level (currently producing about 600 billion, and tantalum capacitors for 25 billion). Moreover, manufacturers of basic metal electrode and technological improvements have greatly reduced the cost of MLCC, which also increased victory chips for MLCC occupation tantalum capacitor market.

And at present ceramics are most cost affective in small sizes. Very large ceramics are a bit of a challenge, especially in SMD.

Currently the large case Suntan offer is up to 2225/3030 at Voltage 500V is 0.68uF, at Voltage 1000V is 0.1uF.

The main voltage : 50V, 100V, 200V, 500V, 1KV, 2KV, 3KV, 4KV

Material : NPO, X7R, Y5V

Size case : 0402, 0603, 0805, 1206, 1210, 1808, 1812, 2220/2225, 3030

MLCC- Suntan TS18 - http://www.capacitors.hk/Ceramic-Capacitors/TS18.html

High Voltage MLCC Suntan TS18H - 
http://www.capacitors.hk/Ceramic-Capacitors/TS18H.html

Application:

DC-DC converter

The circuit filter and vibration bell of telephone, electrograph and modem.

Snubber circuit for switching power supply.

Suntan technical department are ready here to provide further supports and sales are waiting for new inquiry.

Old customers welcome to check offers with Suntan sales, and new customers, please click sales@suntan.com.hk to check prices and stocks !

Thank you for your attention!

Suntan Technology Company Limited
---All Kinds of Capacitors

Effect of Frequency: Frequency affects both capacitance and dissipation factor..

The variation of impedance with frequency is an important consideration in the application of multilayer ceramic capacitors. Total impedance of the capacitor is the vector of the capacitive reactance, the inductive reactance, and the ESR. As frequency increases, the capacitive reactance decreases. However, the series inductance (L)  produces inductive reactance, which increases with frequency. At some frequency, the impedance ceases to be capacitive and becomes inductive. This point, at the bottom of the V-shaped impedance versus frequency curves, is the self-resonant frequency. At the self-resonant frequency, the reactance is zero, and the impedance consists of the ESR only.

Suntan Technology Company Limited
----All Kinds of Capacitors

Dipped Ceramic Capacitors. The simplest ceramic capacitor consists of a square or circular shaped ceramic with electrodes attached (see figure). The capacitance is given by 

where A is the area of the two plates,  is the dielectric permittivity of vacuum, Kd is the dielectric's dielectric constant and d is the distance between the two plates.http://www.capacitors.hk/Ceramic-Capacitors/

Suntan Technology Company Limited
----All Kinds of Capacitors

MLC capacitors are marvels of modern material science. Manufacturing MLC capacitors is considerably more complicated than manufacturing dipped ceramic capacitors. First, the base ceramic material is mixed with a binder and fashioned into thin sheets. Electrodes are painted onto one side of the sheets using a paint that consists of a liquid binder with fine metal particles in suspension. The metals that are used include gold, palladium, platinum, and silver alloys. The reason for using these metals is that when the base ceramic is fired, oxygen is required for the ceramic proper to form. If one uses a metal such as iron, for example, it would oxidize completely during the firing process.Precious metals do not have this problem, but is a major cost component of monolithic ceramic capacitors. However, recently some manufacturers have reported using nickel and copper for the electrodes. This promises to reduce the cost of the raw materials, but at the expense of more elaborate manufacturing processes.

Once the ink is dry, the sheets are stacked on top of each other. The painted electrodes are arranged so that alternate electrodes exit from opposite ends. The top and bottom most layers do not have painted electrodes. The laminated layers are then compressed and fired, which sinters them into one monolithic structure.

Next, the ends are terminated, often using silver. For leaded capacitors, wires are attached, and finally the capacitor is encapsulated in plastic and marked. In the case of chip capacitors, the silver end terminations are covered with tin to aid soldering. The whole capacitor may be covered with lacquer.