APPLICATION GUIDELINE
FOR V-CHIP ALUMINUM ELECTROLYTIC CAPACITORS
1. Circuit Design
⑴ Please make sure the environmental and mounting conditions to which the capacitor will be exposed are within the conditions specified in KJ’s catalogue.
⑵ Operating temperature and applied ripple shall be within KJ specification.
⑶ Appropriate capacitors which comply with the life requirement of the products should be selected when designing the circuit.
⑷ Aluminum electrolytic capacitors are polar. Make sure that no reverse voltage or AC voltage is applied to the capacitors. Please use bi-polar capacitors for a circuit that can possibly see reversed polarity.
Note: Even bi-polar capacitors cannot be used for AC voltage application.
⑸ Do not use aluminum electrolytic capacitors in a circuit that requires rapid and very frequent charge / discharge. In this type of circuit, it is necessary to use a special design capacitor with extended life characteristics.
⑹ Do not apply excess voltage.
① Please pay attention to that the peak voltage, which is DC voltage overlapped by ripple current, will not exceed the rated voltage.
② In the case where more than 2 aluminum electrolytic capacitors are used in series, please make sure that applied voltage will be lower than rated voltage and the voltage will be applied to each capacitor equally by using a balancing resistor in parallel with the capacitor.
⑺ Aluminum electrolytic capacitors shall not be used under the following environmental conditions:
① (a) Capacitors will be exposed to water (including condensation), brine or oil.
(b) Ambient conditions that include toxic gases such as hydrogen sulfide, sulfurous acid, nitrous acid, chlorine, bromine, methyl bromide, ammonium, etc.
(c) Ambient conditions that expose the capacitor to ozone, ultraviolet ray and radiation.
② Severe vibration and physical shock conditions that exceed KJ specification.
Vibration test condition:
vibration frequency range : 10～55～10Hz
sweep rate : 10～55～10Hz/minute
sweep method : logarithmic
amplitude or acceleration : 1.5mm (max. acceleration is 10G)
direction of vibration : X, Y, Z direction
testing time : 2 hours per each direction
Shock is not applicable normally.
If a particular condition is required, please contact our sales office.
⑻ The main chemical solution of the electrolyte and the separator paper used in the capacitors are combustible. The electrolyte is conductive. When it comes in contact with the PC board, there is a possibility of pattern corrosion or short circuit between the circuit pattern, which could result in smoking or catching fire. Do not locate any circuit pattern beneath the capacitor end seal.
⑼ Do not design a circuit board that the heat generating components are placed near the aluminum electrolytic capacitor or on the reverse side of PC board, if that just under the capacitor.
⑽ Please refer to the table of land size(mm) below when you design in surface mount capacitors.
|
|
|
Cap. Size |
a |
b |
c |
|
Φ4 |
1.0 |
2.6 |
1.6 |
|
Φ5 |
1.4 |
3.0 |
1.6 |
|
Φ6.3 |
2.1 |
3.5 |
1.6 |
|
Φ8×6.2L |
2.1 |
4.0 |
1.6 |
|
Φ8×10.5L |
3.0 |
3.5 |
2.5 |
|
Φ10 |
4.0 |
4.0 |
2.5 |
|
Φ12.5 |
4.0 |
5.7 |
3.0 |
|
Φ16 |
6.0 |
6.5 |
3.5 |
|
⑾ Electrical characteristics may vary depending on changes in temperature and frequency. Please consider this variation when you design circuits.
⑿ When you install more than 2 capacitors in parallel, please consider the balance of current flowing into the capacitors.
⒀ While mounting capacitors on double-side PC board, the capacitors should be away from those unnecessary base plate holes and connection holes.
2. Mounting
⑴ Once a capacitor has been assembled in the set and power applied, do not attempt to re-use the capacitor in other circuits or application.
⑵ Leakage current of the capacitors that have been stored for more than 2 years may increase. When leakage current has increased, please perform a voltage treatment using a 1kΩ resistor.
⑶ Please confirm specifications and polarity before installing capacitors on the PC board.
⑷ Do not drop capacitors on the floor, nor use a capacitor that was dropped.
⑸ Do not deform the capacitor during installation.
⑹ Please pay attention to the mechanical shock to the capacitor by suction nozzle of the automatic insertion machine or automatic mounter, or by product checker, or by centering mechanism.
⑺ Reflow soldering
① Please follow “Reflow Soldering Conditions” in KJ’s catalogue.
② When an infrared heater is used, please pay attention to the extent of heating since the absorption rate of infrared will vary due to difference in the color and size of the capacitor.
⑻ Do not tilt lay down or twist the capacitor body after the capacitor are soldered to the PC board.
⑼ Do not carry the PC board by grasping the soldered capacitor.
⑽ Please do not allow anything to touch the capacitor after soldering. If PC boards are stored in stack, please make sure the PC board or other components away from the capacitor.
⑾ The capacitors shall not be effected by any radiated heat from the soldered PC board or other components after soldering.
⑿ Cleaning
① Do not clean capacitors with halogenated cleaning agent. However, if it is necessary to clean with halogenated cleaning agent, please contact our sales office.
② Recommended cleaning method
Applicable : Any type, any ratings
Cleaning agents : Pine Alpha ST-100S, Clean Through 750H/750L/710M, Sanelek
B-12, Aqua Cleaner 210SEP, Techno Care FRW14～17, Isopropyl Alcohol.
Cleaning conditions : Total cleaning time shall be within 2 minutes by immersion, ultrasonic or other methods. Temperature of the cleaning agents shall be 40℃ or below. After cleaning, capacitors should be dried by using hot air for the minimum 10 minutes along with the PC board mounted. Hot air temperature should be within the maximum operating temperature of the capacitor. Insufficient dryness after water rinse may cause appearance problems, such as bottom-plate bulge and etc.
③ Avoid using ozone destructive substances as cleaning agents for protecting global environment.
④ Please consult us regarding other cleaning agents or cleaning methods.
3. In the Equipment
⑴ Do not directly touch terminal by hand.
⑵ Do not link positive terminal and negative terminal by conductor, nor spill conductible liquid such as alkaline or acidic solution on or near the capacitor.
⑶ Please make sure that the ambient conditions where the set is installed are free from spilling water or oil, direct sunlight, ultraviolet rays, radiation, poisonous gases, vibration or mechanical shock.
4. Maintenance and Inspection
Please periodically inspect the aluminum capacitors that are installed in industrial equipment. The following items should be checked:
Appearance: remarkable abnormality such as pressure relief vent opening, electrolyte leaking, etc.
Electrical characteristics: capacitance, dielectric loss tangent, leakage current and etc., which are
specified in KJ’s catalogue or alternate product specification.
5. In an Emergency
⑴ If you see smoke due to operation of safety vent, please turn off the main switch or pull out the plug from the outlet.
⑵ If you breathe the gas or ingest the electrolyte, please wash out your mouth and throat with water immediately.
⑶ If your skin is exposed to the electrolyte, please wash it away using soap and water.
6. Storage
⑴ Do not keep capacitor in high temperature and high humidity atmosphere.
Storage conditions should be:
Temperature : 5℃～35℃
Humidity : lower than 75%
Place : Indoor
⑵ Avoid ambient conditions where capacitors are covered with water, brine or oil.
⑶ Avoid ambient conditions where capacitors are permeated by poisonous gases such as hydrogen sulfide, sulfurous acid, nitrous acid, chlorine, bromine, methyl bromide, ammonium and etc.
⑷ Avoid ambient conditions where capacitors are exposed to ozone, ultraviolet ray or radiation.
7. Disposal
Please take either of the following methods in disposing capacitors.
⑴ Incinerate them after crushing capacitors or making a hole on the capacitor body.
⑵ If incineration is not applicable, hand them over to a waste disposal agent and have them buried in landfills.
