[Explanation of the Causes of Capacitor Failure] A resin-coated capacitor ignited.
A Must-Read Guide for Circuit Designers: 15 Examples of Causes and Countermeasures for Capacitor Failures
When applying an overcoat, please select the resin considering the thermal expansion coefficient of the substrate!
The lead wire film capacitor mounted on the substrate was coated with resin. The connection between the capacitor element and the lead wire sparked, causing the capacitor to ignite. The cause was that the coated resin repeatedly expanded and contracted, applying stress to the capacitor. As a result, the connection between the capacitor element and the lead wire experienced stress and delaminated, leading to a spark when voltage was applied, which caused the capacitor to ignite. [Countermeasures] ■ When applying an overcoat, select resin considering the thermal expansion coefficient of the substrate. * For more details, please refer to the PDF document or feel free to contact us.
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Please be aware of the following: ■ If you implement special mounting methods, such as embedding the capacitor in resin, it may not meet the specifications. ■ If the capacitor resonates due to vibration, the lead wires or electrode parts may break. *For more details, please refer to the PDF document or feel free to contact us.*
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If you see the following symptoms in a capacitor, it is faulty: ■ The case is swollen (bulging) ■ There are cracks in the case ■ There is a gap between the case and the sealing part ■ The pressure relief valve has activated (the pressure relief valve has opened) ■ The case has burst ■ It is hot or generating heat ■ Smoke is coming out ■ There is a liquid leak ■ There are unusual sounds ■ There is an unusual smell *For more details, please refer to the PDF document or feel free to contact us.
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AIC tech handles Aluminum electrolytic capacitors and Film capacitors for industrial market. Our capacitors have a history of more than 70 years and have their origins in technological development in Japan. AIC tech delivers high-value, precision capacitors tailored for power electronics—from renewable energy and industrial systems to transportation, ICT/IoT, healthcare, and infrastructure. Please feel free to contact us if you have any requests.