About Capacitors

What is a''short circuit''?Suntan Capacitors (St Trademark) told you the answers.

A "short circuit" is a connection of very low resistance such as a wire (almost 0Ω) which provides a very easy path for current. Think of it as an electrical short-cut. It is normally used to describe a fault or accidental connection rather than a deliberate one.

For example: If the leads from a battery touch one another they create a very low resistance connection across the battery, so we say they have caused a short circuit across the battery. Current will flow through this short circuit rather than through the proper circuit. This stops the circuit working and it may cause a fire because the leads and battery will become hot with a large current flowing.

What does 'SMD' mean?

'SMD' means Surface Mount Device. SMDs are components with small pads instead of leads for their contacts. They are designed for soldering by machine onto specially designed PCBs and are not suitable for educational or hobby circuits constructed on breadboard or stripboard. Buy our Suntan Capacitors (St Trademark) SMD Rectifier M1-M7 capacitors is your best choose.

Knowing the Capacitor markings of Suntan Capacitors(St Trademark)

Most capacitors have numbers printed on their bodies to indicate their electrical characteristics. Larger capacitors like electrolytics usually display the actual capacitance together with the unit (for example, 220 μF). Smaller capacitors like ceramics, however, use a shorthand consisting of three numbers and a letter, where the numbers show the capacitance in pF (calculated as XY x 10Z for the numbers XYZ) and the letter indicates the tolerance (J, K or M for ±5%, ±10% and ±20% respectively).

Additionally, the capacitor may show its working voltage, temperature and other relevant characteristics.

For example: A capacitor with the text 473K 330V on its body has a capacitance of 47 x 103 pF = 47 nF (±10%) with a working voltage of 330 V.

The Suntan capacitors also have the numbers printed oncapacitors bodies to indicate their electrical characteristics.View the below pictures.

What varistors don't do?

A MOV inside a TVSS device does not provide equipment with complete power protection. In particular, MOV device provide no protection for the connected equipment from sustained overvoltages that may result in damage to that equipment as well as to the protector device.

A varistor provides no equipment protection from inrush current surges (during equipment startup), from over current (created by a short circuit), or from voltage sags (also known as a brownout). A varistor neither senses nor controls such events. Susceptibility of electronic equipment to these other power disturbances is defined by equipment design. Protection from these power disturbances is installed inside that equipment or is provided by other external devices such as an UPS, some voltage regulators and Surge Protectors with built in over voltage protection that make use of a voltage sensing circuit and a relay for disconnecting the AC input when voltage reaches a danger threshold.

Choice of capacitor dielectric

Capacitors use a variety of different substances as their dielectric material. The material is chosen for the properties it provides. One of the major reasons for the choice of a particular dielectric material is its dielectric constant. Those with a high dielectric constant enable high values of capacitance to be achieved - each one having a different permittivity or dielectric constant. This changes the amount of capacitance that the capacitor will have for a given area and spacing.

The dielectric will also need to be chosen to meet requirements such as insulation strength - it must be able to withstand the voltages placed across it with the thickness levels used. It must also be sufficiently stable with variations in temperature, humidity, and voltage, etc.

Electrolytic the two types:Aluminum and Tantalum

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.Our suntan capacitors have this two types of electrolytics.Welcome to send the inquire for our suntan capacitors and we will send the datasheet for your kind review.

Rectifier & Diode

Rectifier & Diode List

• SMD Rectifier M1-M7 (SMD 4001-4007)

Rectifier & Diode Pictures

SMD Rectifier M1-M7 ( SMD 4001-4007 ) Features

1. The plastic package carries Underwriters Laboratory Flammability Classification 94V-0
2. For surface mounted applications
3. Low reverse leakage
4. Built-in strain relief, ideal for automated placement
5. High forward surge current capability
6. High temperature soldering guaranteed: 250°C/10 seconds at terminals

SMD Rectifier M1-M7 ( SMD 4001-4007 ) - MECHANICAL DATA

1. Case : JEDEC DO-214AC molded plastic body
2. Terminals : Solder plated solderable per MIL-STD-750, Method 2026
3. Polarity : Color band denotes cathode end
4. Mounting Position : Any
5. Weight : 0.003 ounce 0.093 grams

Varistor

Varistor List

• Dipped Varistor

Varistor Pictures

Varistor Contact

• Fax #: 852 8208 6246
• Email : info@capacitors.hk

Varistor Knowledge

A varistor is an electronic component with a significant non-ohmic current-voltage characteristic. The name is a portmanteau of variable resistor. Varistors are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in such a way that, when triggered, they will shunt the current created by the high voltage away from the sensitive components. A varistor is also known as Voltage Dependent Resistor or VDR. A varistor’s function is to conduct significantly increased current when voltage is excessive.

Safety Standard Recognized Capacitor

Safety Standard Recognized Capacitor Features

1. Ideal for across the line applications
2. Compact size
3. Cost effective product
4. Safety standards recognized

Safety Standard Recognized Capacitor 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 2600 VAC for 60 seconds

Spark Capacitor

Spark Capacitor Features

• Spark gap capacitors are designed to provide a reliable discharge path for stray, transient overvoltages and static voltage build-up. The construction of the spark gap enable the circuit designer to reduce cost by specifying lower voltage components with the assurance that over-voltage conditions will be prevented.

Spark Capacitor Specifications

• Dissipation Factor (DF) 2.5% Max.
• Insulation Resistance (IR) 7500MΩ Min. or R x C >75Ω·F
• Encapsulation Phenolic coated with wax impregnated