Applications
Aluminum electrolytic capacitors
When employing aluminum electrolytic capacitors, please take note of the following considerations:
Polarity
- Standard electrolytic capacitors exhibit polarity, and subjecting them to reverse voltage can lead to short circuit failure or electrolyte leakage. In cases where the polarity in a circuit is occasionally reversed or unknown, it is advisable to use a bipolar capacitor to prevent such issues.
Overvoltage
- Avoid continuous application of overvoltage. When a capacitor is subjected to overvoltage, there is a significant increase in leakage current. The applied working voltage to capacitors should not surpass the rated working voltage specified for the capacitor.
Operating temperature and life
- Avoid using the capacitor beyond its maximum operating temperature, as the lifetime of the capacitor is directly influenced by temperature. Typically, the lifespan doubles for every 10-degree decrease in temperature. To optimize the longevity of the capacitor, strive to use it at the lowest possible temperature.
Vent
- It is advisable to maintain a minimum clearance of at least 3mm around the vent. Failure to provide this space may impede the complete operation of the vent.
Ripple current
- Avoid applying a ripple current that exceeds the rated maximum ripple current specified for the capacitor. Excessive ripple current can lead to significant heat generation and may result in the deterioration of the capacitor’s properties or even case breakage. If the ripple current is expected to exceed the specified limit, it is recommended to consult the factory for guidance.
Charge and discharging
- The frequent and rapid charge/discharge cycles generate heat within the capacitor, leading to an increase in leakage current, a decrease in capacitance, or occasional breakage. For guidance and assistance in such applications, please consult with us.
Storage
- When a capacitor is stored for an extended period without applying voltage, the leakage current tends to increase. To restore normal operation, it is recommended to apply the rated voltage to the capacitor before use. For capacitors stored for more than 6 months, it is advisable to apply the DC working voltage for 30 minutes through a protective series resistor of 1kΩ. Storage conditions should be maintained at a temperature between 5 degrees to 35 degrees, with humidity levels not exceeding 75%.
Soldering
- Improper soldering can cause insulating sleeve damage, shrinkage, or internal element harm in capacitors. Avoid high temperatures and prolonged soldering to prevent issues.
Mechanical stress on the lead wire and the terminal
Avoid subjecting the lead wire and terminal to excessive force. Once soldered to the PC board, refrain from moving the capacitor or carrying the PC board by picking up the capacitor. For information on their strength, please refer to JIS C-5141 and C-5102 standards.
Cleaning of boards after soldering
- Cleaning the capacitor with a halogenated solvent intended for organic solder flux removal poses a risk, as the solvent may penetrate the interior of the capacitor and potentially lead to corrosion.
Sleeve material
- The standard sleeve material is polyethylene terephthalate. However, exposure to xylene, toluene, etc., followed by high heat, may cause the sleeve to crack. It’s important to note that this sleeve is not an insulating material.