[Explanation of the Causes of Capacitor Failure] A case where characteristics deteriorated after long-term storage.

Please store the capacitors at a temperature between +5°C and +35°C, with a relative humidity of 75% or lower!

We would like to introduce a case where an aluminum electrolytic capacitor, which had been stored for a long time as a spare part, exhibited increased leakage current. Aluminum electrolytic capacitors have the property that their leakage current increases when stored for a long time without a DC bias and under no load, and this property becomes more pronounced at higher storage temperatures. This is believed to be due to the degradation of the dielectric oxide film at high temperatures, which reduces its insulation properties. When voltage is applied in this state, the leakage current increases. 【Countermeasures】 ■ Store capacitors at temperatures between +5°C and +35°C, with relative humidity below 75%. ■ Unless otherwise specified, our aluminum electrolytic capacitors can be stored without voltage under the above conditions for up to 3 years. ■ If within the storage period, capacitors can be used at rated voltage immediately after being taken out from storage. ■ For capacitors that will be mounted on a circuit board by soldering, to prevent issues during soldering, they should be mounted within 2 years. *For more details, please refer to the PDF document or feel free to contact us.

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