The value of Electrolytic Capacitors

December 3, 2010 Views
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Electrolytic capacitors are polarised and they must be connected the correct way round, at least one of their leads will be marked + or -. They are not damaged by heat when soldering.

It is easy to find the value of electrolytic capacitors because they are clearly printed with their capacitance and voltage rating. The voltage rating can be quite low (6V for example) and it should always be checked when selecting an electrolytic capacitor. If the project parts list does not specify a voltage, choose a capacitor with a rating which is greater than the project's power supply voltage. 25V is a sensible minimum for most battery circuits.

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Ceramic Capacitor's HF use

December 1, 2010 Views
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Ceramic capacitors are suitable for moderately high-frequency work (into the high hundreds of megahertz range, or, with great care, into the low gigahertz range), as modern ceramic caps are fairly non-inductive compared to the other major classes of capacitors (film and electrolytic). Capacitor technologies with higher self-resonant frequencies tend to be expensive and esoteric (typically, mica or glass capacitors).

Suntan is a Hong Kong based manufacturer of Ceramic Capacitors. Including High Voltage Ceramic Capacitors, Multilayer Ceramic Capacitors, Ceramic Disc Capacitors, Mini Type Ceramic Capacitors etc.

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The Working Principle Varistor

November 30, 2010 Views
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---All Kinds of Capacitors

Varistor is one kinds of transient voltage suppression devices which can be used instead of transient suppression diodes, zener diode and capacitor combination. Varistor IC and other devices can protect the circuit, to prevent electrostatic discharge, surges and other transient current (such as lightning, etc.) the damage caused by them. Simply use varistors and connected to the protected circuit IC or device, when the voltage value above a certain moment, the varistor resistance decreased rapidly, conducting high current, thereby protecting the IC or electrical equipment; when the voltage is lower than the varistor voltage value, the varistor resistance high, almost open, and thus will not affect the device or the normal operation of electrical equipment.

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Plastic Film Capacitors

November 29, 2010 Views
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Suntan offers Plastic Film Capacitors which are the key components of power supply units. Plastic Film Capacitors help suppress interference and simultaneously decouple semiconductors or are used as DC link capacitors. Suntan Plastic Film covers a wide range of capacitance and voltage, matching a various applications such as HID lamp, photo flash, engine control unit and LCD backlight. All products are environmentaly conscious and comply with RoHs directive.

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Metal oxide varistor

November 28, 2010 Views
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The most common type of varistor is the Metal Oxide Varistor (MOV). This contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides (such as small amounts of bismuth, cobalt, manganese) sandwiched between two metal plates (the electrodes). The boundary between each grain and its neighbour forms a diode junction, which allows current to flow in only one direction. The mass of randomly oriented grains is electrically equivalent to a network of back-to-back diode pairs, each pair in parallel with many other pairs. When a small or moderate voltage is applied across the electrodes, only a tiny current flows, caused by reverse leakage through the diode junctions. When a large voltage is applied, the diode junction breaks down due to a combination of thermionic emission and electron tunneling, and a large current flows. The result of this behaviour is a highly nonlinear current-voltage characteristic, in which the MOV has a high resistance at low voltages and a low resistance at high voltages.

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.  is widely introduced all kinds of electrical products.

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November 26, 2010 Views
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The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having highly perfect basal cleavage. All are monoclinic with a tendency towards pseudo-hexagonal crystals and are similar in chemical composition. The highly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms.

The word "mica" is thought to be derived from the Latin word micare, meaning "to glitter", in reference to the brilliant appearance of this mineral (especially when in small scales).

Based on Mica’s characteristic and other function .Suntan is supplying Silver mica capacitors which are high precision high stability high reliability capacitors. They are available in small values, and are mostly used at high frequencies.

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Ceramic Trimmer Capacitor

November 26, 2010 Views
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Suntan is now a leading firm in the electronic component industry. Based on our unique design and processing technologies we offer a variety of ceramic products including 3mm ceramic trimmer capacitors, 5mm Trimmer Ceramic Capacitor, 6mm and 7mm Ceramic Trimmer Capacitor etc.

The following is one of our Ceramic Trimmer Capacitors,please see its features.If you are interested in other types of Ceramic Trimmer Capacitor,please visit for your reference.

5mm Ceramic Trimmer Capacitor Features

  • As well as applications to small sized electronic apparatus, this series is designed for easy handing and is available with a variety of
  • adjustment method (top, buttom, side and double sides).
  • Wide mounting sizes and variable adjustment available
  • Lots of capacity ranges,3pF through 90pF
  • Sturdy mechanical structure against vibration or shock

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About Plastic film capacitors

November 24, 2010 Views
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A capacitor constructed by stacking, or forming into a roll, alternate layers of foil and a dielectric which consists of a plastic, such as polystyrene or Mylar, either alone or as a laminate with paper.Plastic film capacitors help suppress interference and simultaneously decouple semiconductors or are used as DC link capacitors.

Suntan have 4 types of Axial Film Capacitors, they are differ with different material and different body style.

Suntan have Metallized Polyester Film Capacitor with Cycloidal & Oval body style and Metallized Polypropylene Film Capacitor with Cycloidal & Oval body style also.

The temperature  can up to 105'C at most.

They are mainly used in different instruments, DC & AC circuit of the household equipment and the fractional frequency circuit of acoustics system.

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The Capacitance of Aluminum Electrolytic Capacitors

November 23, 2010 Views
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The capacitance value of any capacitor is a measure of the amount of electric charge stored per unit of potential difference between the plates. The basic unit of capacitance is a farad; however, this unit has been too large for general use until the invention of the double-layer capacitor, so microfarad (μF, or less correctly uF), nanofarad (nF) and picofarad (pF) are more commonly used.

The capacitance of aluminum electrolytic capacitors tends to change over time, and they usually have a tolerance range of 20%. Some have asymmetric tolerances, typically −20% but with much larger positive tolerance as many circuits merely require a capacitance to be not less than a given value.Tantalum electrolytics can be produced to tighter tolerances and are more stable.

Suntan is a Hong Kong based manufacturer of Aluminum Electrolytic Capacitors, Including Snap-in type Electrolytic Capacitor, Screw type and LUG type Aluminum Electrolytic Capacitor, Axial & Radial Electrolytic Capacitor and SMD Aluminum Electrolytic Capacitor etc.

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Safety Standard Recognized Capacitor

November 22, 2010 Views
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Capacitors may retain a charge long after power is removed from a circuit; this charge can cause dangerous or even potentially fatal shocks or damage connected equipment.  Service procedures for electronic devices usually include instructions to discharge large or high-voltage capacitors. Capacitors may also have built-in discharge resistors to dissipate stored energy to a safe level within a few seconds after power is removed.

Our Suntan has produce a Safety Standard Recognized Capacitor ,It’s specifications is descriped its function detailedly as follows.

Safety Standard Recognized Capacitor - Y Pictures

Safety Standard Recognized Capacitor - Y

Safety Standard Recognized Capacitor - Y Specifications
Operating Temperature Range -25°c to +85°c
capacitance range 100pf to 10000pf
capacitance tolerance ±10%, ±20%, +80-20%
rated vlotage ac 125v, 250v, 400v
temperature cofficient ±10% for b (y5p), +30to-80% for fy (y5v)
dissipation factor (tan δ) b: 2.5% max. at 20°c and 1 khz, 1±0.2vrms.
dielectric strength 1500 vac for 60 seconds. (250vac) & 4000 vac for 60 seconds. (400vac)

If you want to have a full knowledge about Safety Standard Recognized Capacitor,please visit   and have a view.

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