Designing Device Circuits

1. Select capacitors suitable for installation and operating conditions,

and use capacitors to meet specified performance limits

this catalog or product specification.

2. Polarity

Aluminum electrolytic capacitors are polarized.

Do not apply reverse voltage or AC voltage to polarized capacitors.

Using reversed polarity can cause short circuit or venting. before use,

Refer to catalog, product specification or capacitor body to identify

Polarity marking. (The shape of the rubber seal does not represent

Polarity direction rules. ) use bipolar non-solid aluminum

Electrolytic Capacitors for Circuits Where Polarity Occurs

reverse. However, be aware that even bipolar aluminum electrolytic

Capacitors must not be used in AC voltage applications.

3. Working voltage

Do not apply DC voltage exceeding the rated voltage. This

Peak voltage of AC voltage (ripple voltage) superimposed on DC

The voltage must not exceed the full rated voltage.

Surge voltage value above full rated voltage is specified

in the catalog, but this is a restricted condition, especially in the short term

time.

4. Ripple current

Ripple current ratings are specified at a certain ripple frequency.

The rated ripple current at several frequencies must be calculated by

Use the original frequency to multiply the rated ripple current

Frequency multipliers for each product family.

5. Category temperature

Using Capacitors Outside the Maximum Rating Category Temperature

Will greatly shorten the life or cause the capacitor to vent.

The relationship between life and life of aluminum electrolytic capacitors

The ambient temperature follows the Arrhenius law, that is, the lifetime is

The ambient temperature is approximately halved for every 10°C increase in ambient temperature.

6. Life expectancy

Capacitors are selected to suit the life of the device.

7. Charge and discharge

Do not use capacitors in circuits with high charge and discharge capacity

The cycle repeats frequently. frequent and violent re-discharge

Cycling will result in reduced capacitance and capacitor damage

due to the heat generated. Specified capacitors can be designed to last

such conditions. Fast charge/discharge can be repeated in the circuit

where the ripple voltage across the aluminum electrolysis

Capacitance fluctuates a lot. If the voltage variation range exceeds

70Vp-p, please consult us.

8. Failure Modes of Capacitors

Non-solid aluminum electrolytic capacitors generally have a lifespan

Ending with an open circuit, the cycle depends on the temperature.

Therefore, the life of the capacitor can be reduced by

Ambient temperature and/or ripple current

9. Insulation

a) Electrically isolate the following parts of the capacitor from the negative pole

terminals, positive terminals and circuit traces.

• Cases for non-solid aluminum electrolytic capacitors.

• Dummy terminals for non-solid aluminum electrolytic capacitors,

This is designed for installation stability.

b) The casing of the capacitor is not guaranteed to be an insulator (except

 for screw type). For applications requiring an insulating outer layer

 sleeve, custom designed capacitors are recommended.

10. Conditions

Do not use/exposed capacitors under the following conditions.

a) Oil, water, brine. Avoid storing in damp places.

b) Direct sunlight.

c) Toxic gases such as hydrogen sulfide, sulfurous acid, nitrous acid, chlorine or its compounds, and ammonium.

d) Ozone, UV or radiation.

e) Severe vibration or mechanical shock conditions beyond the limit

 specified in the catalog or product specification.

11. Installation

a) Electrolytic paper and electrolytic conductive electrolyte

 Non-solid aluminum electrolytic capacitors are flammable. leakage

 Electrolyte on printed circuit boards can gradually corrode copper

traces, which may cause smoking or burning through a short circuit

copper traces.

 Verify the following points when designing the PC board.

• Provide proper hole spacing on PC board to match

 Terminal spacing of capacitors.

• Leave the following open space above the vent so that the vent can

Proper operation.

 Case Diameter Clearance

 Ø6.3 to Ø16mm minimum 2mm

 Ø18 to Ø35mm minimum 3mm

 Ø40mm or more 5mm minimum

• Do not place any wires or copper traces on the device's vents.

capacitor.

• Installing a capacitor with a vent facing the PC board requires a

There are proper ventilation holes on the PC board.

• Do not run any copper traces under the capacitor seal.

The traces must go through 1 or 2mm to one side of the capacitor.

• Avoid placing any hot objects near

capacitors, even on the reverse side of the PC board.

• Do not pass anything through holes or under capacitors.

• When designing double-sided printed circuit boards, do not place any copper

Trace the sealed side of the next capacitor.

b) Do not install the terminal side of the screw-mounted capacitor downward.

If the screw terminal capacitor is mounted on its side, make sure

Positive is higher than negative.

 Do not fasten the terminal screws and mounting clips to the

Specified torque specified in catalog or product specification

Quote.

c) For surface mount capacitors, design the copper pads of the PC board

According to catalog or product specification.

12. Others

a) The electrical characteristics of capacitors vary with temperature, frequency and lifetime. By taking the design of the device circuit

   Take these changes into account.

b) Capacitors installed in parallel require current to flow evenly

   individual capacitors.

c) Capacitors installed in series need to be connected in parallel with resistors

Separate capacitors to balance the voltage.

d) Use capacitors in applications where safety is always a concern. to consult

Our factories are before they are used in applications that can affect human life. (space

equipment, aviation equipment, nuclear equipment, medical equipment,

vehicle control equipment, etc.) Please note that this product is

Designed for a specific purpose, not for other purposes

use. (eg photo flash type etc.)