Suntan Blog

Electric Double Layer Capacitor do not have a conventional dielectric. Rather than two separate plates separated by an intervening substance, these capacitors use "plates" that are in fact two layers of the same substrate, and their electrical properties, the so-called "electrical double layer", result in the effective separation of charge despite the vanishingly thin (on the order of nanometers) physical separation of the layers. The lack of need for a bulky layer of dielectric permits the packing of plates with much larger surface area into a given size, resulting in high capacitances in practical-sized packages.

In an electrical double layer, each layer by itself is quite conductive, but the physics at the interface where the layers are effectively in contact means that no significant current can flow between the layers. However, the double layer can withstand only a low voltage, which means that electric double-layer capacitors rated for higher voltages must be made of matched series-connected individual Electric Double Layer Capacitor, much like series-connected cells in higher-voltage batteries.

Electric Double Layer Capacitor have much higher power density than batteries. Power density combines the energy density with the speed that the energy can be delivered to the load. Batteries, which are based on the movement of charge carriers in a liquid electrolyte, have relatively slow charge and discharge times. Capacitors, on the other hand, can be charged or discharged at a rate that is typically limited by current heating of the electrodes. So while existing Electric Double Layer Capacitor have energy densities that are perhaps 1/10th that of a conventional battery, their power density is generally 10 to 100 times as great (see diagram, right).

Mica capacitors are currently used in some low power RF designs, and pulse (snubber) applications, but advances in ceramic capacitor performance have slowly eroded mica’s traditional edge in these areas over the years. Perhaps more importantly, mica capacitors tend to be bulky—a result of the relatively low dielectric constant. For example, a 300 pF dipped mica capacitor may be as much as 16 times larger (in volume) than a good 300 pF MLC (NPO) capacitor. This low volumetric efficiency is a serious drawback in many applications such as portable electronic equipment. Some chip mica capacitors are available, but they tend to be expensive. Mica capacitors are still indispensable in high-power RF transmitter applications. In the latter case special rectangular, cylindrical, and button-style cases are used. Another niche is high-voltage applications that are a result of mica’s high dielectric breakdown and corona resistance.

Suntan Silver Mica Capacitors are available with values that range from 1–22,000 pF, voltages are in the range 50–1000V for standard dipped mica capacitors. Mica capacitors exhibit very little voltage dependence, have high Q or conversely small power factors that are quite independent of frequency. With all these advantage, our mica capacitors are ideal for high requence and RF applications.

SMD Trimmer Potentiometer - 3mm Features

• Reflow solderable
• With rotation stopper
• Low profile type (1.2mm in height)
• Conform to RoHS Directives
• Achieved excellent endurance characteristics by using “ Metal-glaze ” film
• Standard Resistance Range 100 to 1M

Tantalum capacitors are a particularly useful form of capacitor. They offer a high capacity density, and provided they are operated within their ratings, they offer a high degree of reliability. Also they lend themselves to surface mount technology and in this guise tantalum capacitors are used in vast quantities each day.

Suntan provides Chip Tantalum Capacitor SMD—TS20, This type of capacitor is with 6 different sizes ( P case, A case, B Case, C case, D case, E Case ).

An electrolytic capacitor is a type of capacitor that uses an electrolyte, an ionic conducting liquid, as one of its plates, to achieve a larger capacitance per unit volume than other types. They are often referred to in electronics usage simply as "electrolytics". They are used in relatively high-current and low-frequency electrical circuits, particularly in power supply filters, where they store charge needed to moderate output voltage and current fluctuations in rectifier output. They are also widely used as coupling capacitors in circuits where AC should be conducted but DC should not. There are two types of electrolytics; aluminum and tantalum.

A common modeling circuit for an electrolytic capacitor has the following schematic:

Where Rleakage is the leakage resistance, RESR is the equivalent series resistance (ESR), LESL the equivalent series inductance (L being the conventional symbol for inductance).

RESR must be as small as possible since it determines the loss power when the capacitor is used to smooth voltage. Loss power scales quadratically with the ripple current flowing through and linearly with RESR. Low ESR capacitors are imperative for high efficiencies in power supplies. Low ESR capacitance can sometimes lead to destructive LC voltage spikes when exposed to voltage transients.

This is only a simple model and does not include dielectric absorption (soakage) and other non-ideal effects associated with real electrolytic capacitors.

Multilayer ceramic capacitors are available in a variety of physical sizes and configurations, including leaded devices and surface mounted chips. Leaded styles include molded and conformally coated parts with axial and radial leads. However, the basic capacitor element is similar for all styles. It is called a chip and consists of formulated dielectric materials which have been cast into thin layers, interspersed with metal electrodes alternately exposed on opposite edges of the laminated structure. The entire structure is fired at high temperature to produce a monolithic block which provides high capacitance values in a small physical volume. After firing, conductive terminations are applied to opposite ends of the chip to make contact with the exposed electrodes. Termination materials and methods vary depending on the intended use.

Suntan TS17 Axial Multilayer Ceramic Capacitor, it can be made 50VDC and 100VDC, from 100pF to 1uF. The leads can be bended for mounting purpose.

Multilayer (mono) Axial & Radial Features:

Wide application in computer, data processor, telecommunication, Industrial control, and instrumentation equipments, etc.

Built by superior moisture and shock resistant epoxy coating, can be supplied in both bulk or tape and reel package for automatic insertion in printed circuit board.

Multilayer varistor (MLV) devices provide electrostatic discharge protection to electronic circuits from low to medium energy transients in sensitive equipment operating at 0-120 volts dc. They have peak current ratings from about 20 to 500 amperes, and peak energy ratings from 0.05 to 2.5 joules.

Suntan is with very good support for Multilayer Metal Oxide Chip Varistor. This products is featured with Low firing, Sliver diffusion, Grain resistance, Electrical properties and it is widely used in cellular telephones and automotive electronic subassemblies.

Suntan Technology Company Limited will attend Electronic Americas 2011 in Sao Paulo, Brazil from March 28th to April 1st, 2011

• Fair name: Electronic Americas 2011
• Add.: Sao Paulo, Brazil
• Date: March 28th to April 1st, 2011
• Booth No.:N₁50

On this exhibition, all products will be presented, like metalized polyester/ polypropylene film capacitor including X2 capacitor, MLCC and high voltage ceramic capacitor, aluminum electrolytic capacitor, trimming potentiometer, varistor and rectifier diode.

Welcome to visit our booth to establish or expand our business!

This type of capacitor is a essentially a form of polyester film capacitor where the polyester films themselves are metallised. The advantage of using this process is that because their electrodes are thin, the overall capacitor can be contained within a relatively small package. The metallised polyester film capacitors are generally only available as leaded electronics components.

Suntan is a Hong Kong based manufacturer of Plastic Film Capacitors, Its Metallised Polyester Film Capacitor is NON-INDUCTIVE, EXTENDED FOIL, DIP COATED, HIGH MOISTURE RESISTANCE, Such as their TS02 .TS02 has three features:

1.High reliable with its Self-Healing performance.

2.Coated with epoxy resin for superior heat resistance, humidity resistance and solvent resistance.

3.Good reputation in use with filtering, DC blocking coupling and general communication equipment.

In Suntan’s website: www.suntan.com.hk there is all TS series Capacitors. Detailed Features & Specifications & PDF will give you a new knowledge of Electrical Capacitors.

An electric double-layer capacitor, also known as supercapacitor, supercondenser, pseudocapacitor, electrochemical double layer capacitor (EDLC), or ultracapacitor, is an electrochemical capacitor with relatively high energy density, typically on the order of thousands of times greater than an electrolytic capacitor. For instance, a typical D-cell sized electrolytic capacitor displays capacitance in the range of tens of millifarads. The same size electric double-layer capacitor might reach several farads, an improvement of two orders of magnitude. Supercapacitors usually yield a lower working voltage. as of 2010 larger double-layer capacitors have capacities up to 5,000 farads. Also in 2010, the highest available supercapacitor energy density is 30 Wh/kg, (although 85 Wh/kg has been achieved at room temperature in the lab ) lower than rapid-charging lithium-titanate batteries.

Suntan is a Hong Kong based manufacturer of Gold Capacitors. Including Low Leakage Double Layer Capacitor, Stacked Coin Gold Capacitor and Serial Struction Gold Capacitor etc.

Electric Double-Layer Capacitor is Small-size, large capacity, excellent voltage holding. For all ratings, uniform 5 mm pitch of terminal spacing. Wider temperature range(-25~+70℃) thank battery makes periodic change unnecessary.13.5x7.5 size can encase up to 0.33F. Ideal for backing up of CMOS's, microcomputers, RAM's and the like used in VCR's, tuners, TV sets, telephone sets and other.