How do I start selecting a CapXon snap-in capacitor?

Fix the voltage class from your bus with margin, choose the capacitance from the ripple and hold-up you need, then confirm the case size, the terminal spacing and the lifetime for the application. Those decisions narrow the selection quickly.

How much capacitance do I need?

Size the capacitance from the voltage ripple you can tolerate and the hold-up time you need, then check the ripple current rating at your case temperature and frequency. More capacitance lowers the ripple but raises the inrush and the cost. Confirm the ripple margin on the bench.

Which snap-in series suits a long-life design?

The HU series is a 105 °C general-purpose range rated 2000 hours, and the UJ series is a 105 °C long-life range rated up to 5000 hours, which suits equipment that runs continuously such as supplies and inverters. Our FAE team can help you choose.

Can BeiLuo help finalize my capacitor choice?

Yes. Send your bus voltage, ripple, hold-up and life target, and we will propose a shortlist with capacitance, case size, ripple rating and stock status, then support the design-in. Getting the capacitor right saves project time.

How do I start selecting a CapXon radial capacitor?

Fix the voltage class, choose the capacitance from the ripple and the filtering you need, then confirm the case size, the lead spacing and the lifetime. A radial part is usually chosen for a dense board. Those decisions narrow the selection quickly.

Which radial series should I choose?

The KM series is a general-purpose 105 °C choice, the KY series is a slim high-voltage part for a height-limited primary, and the LE series is the ultra-long-life choice rated up to 12000 hours for equipment that must run for years. Choose by voltage, life and size.

How important is the lead spacing?

The lead spacing must match the board footprint, and the standard 2.5 mm and 5 mm spacings cover most designs. Confirm the spacing and the case diameter against the layout before you commit, because a wrong spacing forces a board change. Our FAE team can review the footprint.

How do I get the longest life from a radial part?

Keep the capacitor cool and the ripple within the rating, and choose the LE series where the service interval matters. Because electrolytic life roughly doubles for every 10 °C reduction in core temperature, the case temperature is the key number. Our FAE team can estimate the lifetime for your conditions.

What is ripple current and why does it matter?

Ripple current is the alternating current that flows through the capacitor as it charges and discharges each switching cycle, and it heats the capacitor through its ESR. Keeping the ripple within the rating holds the core temperature, and therefore the life, within the design target. Measure the actual ripple on the bench.

How do I estimate the capacitor lifetime?

Estimate the core temperature from the case temperature and the ripple heating, then apply the endurance and the temperature rule: the life roughly doubles for every 10 °C reduction in core temperature. Keep the ripple within the rating for the temperature. Our FAE team can run the lifetime estimate for you.

How do I keep the capacitor cool?

Keep the ripple within the rating, space the capacitors for airflow and keep them away from the hottest components, and choose a bigger can or a lower-ESR part where the ripple is high. A cooler capacitor lasts far longer. Our FAE team can review the layout.

How do I verify the thermal margin?

Measure the case temperature at worst-case load and ambient, compare it with the derating curve, and confirm the ripple margin before you release the design. This evidence turns a capacitor choice into a verified decision. Our FAE team can check the margin with you.

My capacitor lost capacitance over time. Why?

Capacitance loss is normal aging driven by temperature and ripple: the electrolyte evaporates faster when the core runs hot, so a capacitor that runs above its design temperature loses capacitance faster. Check the case temperature and the ripple against the rating. Reduce the temperature or the ripple to slow the aging.

My capacitor is running hot. What should I check?

Check the ripple current against the rating at the case temperature, the airflow and the clearing around the capacitor, and whether it sits next to a hot component. A high ESR, a too-small can or a blocked airflow all raise the temperature. Improve the layout and confirm the ripple margin.

The capacitor bulged or vented. What went wrong?

A bulge or a vent usually means over-voltage, reverse polarity or a severe over-temperature. Check the applied voltage against the rating including transients, the polarity of the assembly and the temperature, and review the inrush and the ripple. Any bulged unit must be removed from service.

How do I choose a part that lasts longer?

Choose a long-life series, keep the ripple within the rating and keep the case cool. The CapXon LE and UJ series rate 12000 and 5000 hours at 105 °C, and every 10 °C reduction roughly doubles the life. Our FAE team can recommend a longer-life part for your conditions.

What is the standout feature of the CapXon range?

The standout feature is the breadth of the range across snap-in and radial in many case sizes, from a few microfarads to more than 20000 uF, with a wide voltage spread and both general-purpose and long-life series, at a competitive cost. The main design care points are ripple and thermal.

How do the snap-in parts perform in practice?

In practice a snap-in capacitor mounts directly on the board without a clamp and holds its capacitance and ripple across the temperature range. On the bench the parts met their ripple ratings with margin when they were kept cool, which is the main design lever. Confirm the case temperature at worst-case load.

Are there long-life and automotive options?

Yes. The LE radial and UJ snap-in series offer long life at 105 °C, and several CapXon series are AEC-Q200 qualified for automotive use. Confirm the qualified part number and the temperature grade for your application. Our FAE team can confirm the qualification.

Can I get samples to evaluate?

Yes. We provide samples of the CapXon capacitors for your own ripple and thermal testing, with documentation included and FAE support during bring-up. Request a sample and we will confirm stock and lead time.

Technical Support | CapXon Expertise | BeiLuo

Guides, application notes, troubleshooting and reviews from BeiLuo's FAE team covering CapXon aluminum electrolytic capacitors in detail for power designs.

Guides 2 Application Notes 1 Troubleshooting 1 Reviews 1

How to Select a CapXon Snap-In Capacitor

2026-07-26 - Guides - By Chen Wei Liang

Compare CapXon snap-in aluminum electrolytic capacitors by capacitance, voltage, case size, ripple and lifetime for bulk storage, DC links and power supplies.

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How to Select a CapXon Radial Capacitor

2026-07-21 - Guides - By Lin Jia Hao

A practical method for selecting CapXon radial leaded capacitors by voltage, life and lead spacing for dense control boards, power supplies and converters.

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CapXon Capacitor Ripple and Lifetime Notes

2026-07-16 - Application Notes - By Zhang Guo Qiang

Ripple current, case temperature and lifetime guidance for applying CapXon aluminum electrolytic capacitors reliably in power supply, drive and inverter designs.

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Troubleshooting CapXon Capacitor Failures

2026-07-09 - Troubleshooting - By Zhang Guo Qiang

A systematic method for diagnosing capacitance loss, ESR rise, leakage and thermal failures in CapXon electrolytic capacitors and how to fix the root cause.

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CapXon Capacitor Review and Test Report

2026-06-30 - Reviews - By Chen Wei Liang

A hands-on review of CapXon snap-in and radial aluminum electrolytic capacitors for supplies and drives, covering ripple, ESR and life in real designs.

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Meet Our FAE Team

Chen Wei Liang

Senior FAE Engineer, Capacitors

Snap-In CapacitorsDC LinksSupplies

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Lin Jia Hao

FAE Engineer, Radial Capacitors

Radial CapacitorsLow ESRLong Life

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Zhang Guo Qiang

FAE Engineer, Applications

Ripple CurrentLifetimeReliability

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