Radial Leaded Capacitor

Radial Leaded Capacitor

Radial Lead Capacitor

Radial lead capacitor has two leads that protrude from the bottom of the capacitor. In this sense, they are different from the configuration of axial capacitors, which have one lead at each end.

We offer different types of radial leaded capacitors customized ranging from 1000uf25v to 4700uf35v, customizing radial electrolytic capacitors to your requirements for all your applications.


Radial leaded electrolytic capacitors are high volume, small size, high reliability, long life, high reliability, stable capacity, good resistance to high temperature and humidity, etc.

Application scope:

Radial lead type aluminum electrolytic capacitors are widely used in electronic precision instruments. Various small electronic devices for resonance, coupling, filtering, bypass.

How to distinguish the positive and negative polarity of radial lead type capacitor?

Radial electrolytic capacitors are polarized, so it is important for them to have the polarity soldered correctly. If not, they will exhaust (bulge at the top) after a few minutes of operation.

The positive and negative electrolytic capacitors are distinguished: the black block with the logo on top of the capacitor is the negative pole, there are two semicircles on the capacitor position on the PCB, the color painted semicircle corresponding to the pin is the negative pole, also the length of the pin is useful to distinguish the positive and negative polarity.

1、Bolt type electrolytic capacitor positive and negative identification. Bolt type aluminum electrolytic capacitors have clear positive and negative identification on the casing, positive pole is marked with "+" and negative pole is marked with "-". Most of the bolt type capacitors have "+" and "-" marks engraved next to the terminals on the cover.

2、Differentiation of positive and negative electrodes of solder lug aluminum electrolytic capacitors. Solder lug aluminum electrolytic capacitors are also called bullhorn capacitors, currently all manufacturers choose "negative pole marking", that is, the solder pin corresponding to the casing "-" mark is the negative pole. Most of them adopt "embossing" to identify the negative pole, and some electrolytic capacitor manufacturers directly print "+" and "-" on the rivet. logo.

3、Lead structure electrolytic capacitor positive and negative identification method. The lead structure electrolytic capacitor also adopts "negative pole identification", that is, the lead corresponding to the "-" mark of the casing is negative pole. There is also the identification by the length of the lead, the long lead is the positive pole, the short lead is the negative pole.

If you want to know more about electrolytic capacitors, please contact us.

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Home > Capacitors > Radial Leaded Capacitor > Aluminum electrolytic capacitor 3300UF35V ±20% temp-40°~105° withstand high temperature

Aluminum electrolytic capacitor 3300UF35V ±20% temp-40°~105° withstand high temperature

Aluminum Electrolytic Capacitor 3300uf35v

SHDR® Application Notes

■ Install capacitors

1. Installation

a) Used capacitors cannot be reused unless the capacitor

Remove from equipment for periodic inspection to measure its

 electrical characteristics.

b) If the capacitor is self-charging, discharge the capacitor through a

 Use a resistor of about 1kΩ before use.

c) If the capacitor is stored at 35°C or higher and exceeds

 75% RH, leakage current may increase. In this case, they can re-

 Formed by applying the rated voltage through a resistor of approximately


d) Verify the rated capacity and voltage of the capacitors at the time of installation.

e) Verify the polarity of the capacitors.

f) Do not use the capacitor if it has been dropped on the floor.

g) Do not deform the case of the capacitor.

h) Verify that the lead spacing of the capacitor matches the hole spacing

Before installing the capacitors on the PC board. some standard pre-

 Formed leads are available.

i) For pin terminals or snap-in terminals, insert the terminal into

PC board and press the capacitor down until the bottom

 The capacitor body reaches the surface of the PC board.

j) Do not apply any mechanical force exceeding the specified limits

in the capacitor's catalog or product specification. return,

Note that capacitors may be damaged by mechanical shock caused by

Centering operations for vacuum/insertion heads, component checkers or automatic mounting or insertion machines.

2. Solderability and Solderability

a) When soldering with a soldering iron

• Soldering conditions (temperature and time) should be within limits

 specified in the catalog or product specification.

• If the terminal spacing of the capacitor does not match the terminal hole spacing of the PC board, modify the terminals to minimize

 Mechanical stress enters the body of the capacitor.

• Remove the capacitor from the printed circuit board, after the solder is completely

Melt, minimize mechanical rework by using a soldering iron

 stress capacitors.

• Do not touch the capacitor body with the hot tip of the soldering iron.

b) Flow soldering

• Do not immerse the capacitor body in the solder pool, only the capacitor

 Terminals are in. Soldering must be done on the reverse side of the PC


• Soldering conditions (preheating, soldering temperature and immersion time)

should be within the scope specified in the catalog or product


• Do not apply flux to any part other than the capacitor terminals.

• Make sure the capacitor does not touch any other

 components while soldering.

c) Reflow soldering (SMD type only)

• Soldering conditions (preheating, soldering temperature and immersion time)

 Should be within the range specified in the catalog or product specification


• When setting the temperature infrared heater, consider

Infrared absorption causes material to discolor and change


• Do not use reflow to solder capacitors multiple times. if it should be

 Made it twice, please consult us first.

• Make sure the capacitors are not in contact with the copper traces.

d) Do not reuse surface mount capacitors that have been soldered.

 Also, when installing new capacitors on the assembly board

Rework to remove old residual flux from PC board surfaces,

 Then use the soldering iron under the specified conditions.

e) Confirm whether the capacitor is suitable for reflow soldering.

3. Treatment after welding

Do not apply any mechanical stress to the capacitor after soldering


a) Do not tilt or twist the body of the capacitor after soldering -

acitors to the PC board.

b) Do not use capacitors to lift or carry assembled boards.

c) Do not knock or poke the capacitors after they are soldered to the PC board.

When stacking assembled boards, be aware that other components will not

 Do not touch aluminum electrolytic capacitors.

d) Do not drop the assembly board.

4. Clean the PC board

a) Do not use the following cleaning agents to clean capacitors.

• Halogenated Solvents: Causes capacitors to fail due to corrosion.

• Alkaline system solvents: Corrode (dissolve) aluminum housings.

• Petroleum and terpene system solvents: cause rubber sealing materials


• Xylene: Causes deterioration of rubber seals.

• Acetone: Erase marks. Solvent Resistant Capacitors Only

Washed under the cleaning conditions specified in the catalogue or

 Product Specifications. Especially ultrasonic cleaning will speed up

damage the capacitor.

b) When cleaning the capacitor, please confirm the following points.

• Monitor conductivity, pH, specific gravity and water content

 detergent. Contamination can adversely affect these properties.

• Be sure not to place capacitors in

 detergent or in an airtight container.

 In addition, please dry the solvent on the PC board sufficiently,

 Air knife for capacitor (temperature should be below

 the maximum rated category temperature of the capacitor) for more than 10 minutes.

 Aluminum electrolytic capacitors can have characteristics and

 Severely damaged by halide ions, especially chloride ions,

 Although the degree of damage depends mainly on

 Properties of electrolytes and rubber sealing materials. when

 Halogen ions come into contact with capacitors, foil corrodes

 when voltage is applied. This corrosion leads to extremely high leakage

 current, which in turn can cause ventilation and open circuits.

5. Notes on using adhesives and coatings

a) Do not use any halide containing adhesives and coatings


b) Verify the following before using adhesive and coating materials.

· Remove residual flux and dust between rubber seal and PC

 Before applying adhesive or coating material to the capacitor.

· Dry and remove any residual cleaner before applying the adhesive

 and capacitor coating materials. don't cover the whole

 Rubber seal surfaces with adhesive or coating material.

· Permissible thermal conditions for curing adhesive or coating materials

Also, follow the directions in the catalog or product specification

 Capacitor testing.

· Cover the entire surface of the capacitor rubber seal with resin

 Dangerous situation may result because the internal pressure cannot

 was completely released. In addition, the resin contains a large amount of halogen ions

 will cause the capacitor to fail because the halide ions penetrate into the

Rubber seal and inside of capacitor.

c) Some coating materials do not cure on capacitors. caution

 The surface of the outer casing is loose in gloss and may be whitish

 Caused by the type of solvent used for installation

 Adhesives and Coatings.

6. Fumigation

In many cases, when exporting or importing electronic equipment, such as

Capacitors in wooden packaging. To control insects, most commonly,

 It is necessary to fumigate the goods. Notes during the period

Must be "fumigated" with halogenated chemicals such as methyl bromide

take. Halogen gases can penetrate packaging materials used, for example,

Cardboard box and vinyl bag. The permeation of halogenated gases can

Causes electrolytic capacitor corrosion.

Product Picture


  • Aluminum electrolytic capacitor 3300UF35V ±20%  temp-40°~105° withstand high temperature

  • Aluminum electrolytic capacitor 3300UF35V ±20%  temp-40°~105° withstand high temperature

  • Aluminum electrolytic capacitor 3300UF35V ±20%  temp-40°~105° withstand high temperature

  • Aluminum electrolytic capacitor 3300UF35V ±20%  temp-40°~105° withstand high temperature

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