Sep 2, 2026
Common Causes of Aluminum Electrolytic Capacitor Bulging and Premature Failure
Draft technical article on electrical, thermal and installation conditions that can cause capacitor bulging or early failure.
Common Causes of Aluminum Electrolytic Capacitor Bulging and Premature Failure
Bulging is a warning sign, not a complete diagnosis. Possible causes include excessive ripple-current heating, high ambient or internal temperature, overvoltage, reverse voltage, abnormal charging, inadequate cooling, unsuitable ESR, mechanical stress, incorrect mounting or operation beyond the intended endurance conditions.
A failed component should be handled safely and the equipment de-energized before inspection. Do not simply replace a capacitor with the same voltage and capacitance without checking ripple current, frequency, temperature, ESR or impedance, dimensions, terminal style and the surrounding circuit condition.
For root-cause or replacement support, record the original part number, equipment type, operating voltage, ripple waveform if available, ambient temperature, cooling condition, failure location and photographs. COREVIA can then review the requirements and identify suitable product families from confirmed data.
Related reading: ripple current and ESR, capacitor endurance and temperature, and capacitor replacement and cross-reference support.
