LQSW6221MELB30

The LQSW6221MELB30 is an aluminum electrolytic capacitor in Nichicon’s LQS series featuring a snap‑in terminal package and a 105°C high speed charge‑discharge design. With a rated voltage of 420 V and capacitance of 220 µF, it is intended for power electronics environments that demand high‑voltage energy buffering and robust thermal endurance.

It is suited for high‑frequency regenerative voltages in AC servomotors and general inverters, for equipment operating in fluctuating voltage conditions, and for rectifier circuits such as voltage doublers. The part is RoHS compliant.

Key Features

• High voltage rating — Rated voltage of 420 V to support medium‑voltage power stages and DC bus filtering.
• 220 µF capacitance with ±20% tolerance — Provides substantial energy storage for smoothing and transient support; tolerance specified as −20% to +20% at 120 Hz, 20°C.
• 105°C high‑temperature operation — Operating temperature range from −25°C to +105°C with an endurance rating of 3000 hours at 105°C under rated DC bias plus rated ripple current.
• High speed charge‑discharge capability — Designed and tested for repeated charge‑discharge cycles; series endurance characterization includes performance after 50 million charge‑discharge cycles under specified test conditions.
• Ripple current performance — Rated ripple currents of 1.05 A at 120 Hz and 1.502 A at 50 kHz to support AC components and switching environments.
• Snap‑in radial can package — Snap‑in terminal type for secure mechanical mounting in power assemblies; package case listed as radial, can – snap‑in.
• Electrical stability and leakage spec — Leakage current specified as I ≤ 3√(C·V) μA after 5 minutes at 20°C; maximum tan δ of 0.15 at 120 Hz, 20°C (for 420 V rating).
• Low‑temperature impedance stability — Impedance ratio Z(−25°C)/Z(+20°C) specified with a maximum of 8 for rated voltages in this series.
• RoHS compliant — Meets RoHS directive requirements (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor drives — Energy buffering and regenerative voltage handling in servo drive power stages where frequent charge‑discharge events occur.
• General inverters — DC bus smoothing and transient support in inverter systems subject to fluctuating input or regenerative currents.
• Voltage doubler/rectifier circuits — Use in rectifier sections and voltage doubler arrangements where high DC voltage and reliable charge handling are required.
• Equipment with fluctuating supply voltage — Robust thermal and electrical endurance for systems that experience wide or dynamic voltage changes.

Unique Advantages

• High‑voltage, high‑capacitance combination: 420 V and 220 µF provide substantial energy storage for DC bus and regenerative applications without increasing part count.
• Thermal endurance: Rated to operate to 105°C with a specified 3000‑hour endurance at that temperature under rated conditions, supporting long service life in thermally demanding installations.
• Charge‑discharge durability: Endurance validation includes performance after 50 million charge‑discharge cycles under the series’ test conditions, supporting applications with frequent energy reversals.
• Measurable leakage and loss limits: Leakage current and tan δ are specified (I ≤ 3√CV μA; tan δ max. 0.15 at 420 V), enabling predictable loss and standby behavior in system power budgets.
• Designed for high‑frequency ripple: Specified ripple current ratings at both 120 Hz and 50 kHz make the device suitable for switching and regenerative environments.
• Secure snap‑in mounting: Radial snap‑in can package provides reliable mechanical attachment for robust power assemblies.

Why Choose LQSW6221MELB30?

The LQSW6221MELB30 from Nichicon’s LQS series is positioned for power electronics designs that require a combination of high voltage handling, substantial capacitance, and proven endurance under frequent charge‑discharge conditions. Its rated 420 V, 220 µF capacity, high ripple current capability, and 105°C endurance make it a practical choice for inverter, servo drive, and rectifier circuits operating in fluctuating voltage environments.

Designed to provide predictable electrical behavior—specified limits for leakage, tan δ, and impedance stability—this snap‑in aluminum electrolytic capacitor supports engineers who need reliable energy storage and thermal robustness in medium‑voltage power subsystems.

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