LQSW6331MELC30

The LQSW6331MELC30 from Nichicon is an aluminum electrolytic, snap‑in terminal capacitor in the LQS series designed for high‑speed charge–discharge applications. It provides 330 µF capacitance at a 420 V rating and is built for demanding power electronics environments.

Suited for high‑frequency regenerative voltage applications such as AC servomotor drives and general inverters, this component also addresses equipment in voltage‑fluctuating areas and rectifier circuits using voltage doublers. The device is specified for operation from –25°C to +105°C and meets RoHS (2011/65/EU, (EU)2015/863) requirements.

Key Features

• High voltage rating — Rated for 420 V to support DC bus and high‑voltage power stages.
• Capacitance and tolerance — 330 µF with ±20% tolerance at 120 Hz, 20°C, providing bulk energy storage for power conversion circuits.
• Snap‑in radial can package — Snap‑in terminal type and radial can (snap‑in) package for secure PCB mounting in power assemblies.
• High‑temperature endurance — Specified for operation up to 105°C with a rated endurance of 3000 hours at 105°C under DC bias plus rated ripple current.
• High‑frequency performance — Rated ripple current of 1.42 A at 120 Hz and 2.031 A at 50 kHz, and characterized for high‑speed charge–discharge behavior suitable for regenerative circuits.
• Polarized design — Polarized aluminum electrolytic construction for use where polarity is defined.
• Controlled loss and leakage — Specified tan δ (maximum 0.15 at 420 V, 120 Hz, 20°C) and leakage current defined by I ≤ 3√(C·V) μA after 5 minutes at rated voltage.
• Temperature stability — Category temperature range of –25°C to +105°C and impedance stability specified at low temperature (Z(–25°C)/Z(+20°C) ≤ 8 for the rated voltage range).
• Compact dimensions — 35 mm diameter × 30 mm length for dense power module layouts.

Typical Applications

• AC servomotor drives — Provides energy buffering and regenerative voltage handling in servo drive regenerative circuits.
• General inverters — Bulk capacitance and high‑frequency ripple handling for inverter DC bus and switching stages.
• Voltage‑doubler rectifier circuits — Sized and specified for use in rectifier circuits employing voltage doubling topologies.
• Equipment in fluctuating voltage environments — Suitable where line voltage variations and regenerative events require robust, high‑voltage bulk storage.

Unique Advantages

• 420 V rating for high‑voltage systems — Enables direct use on higher DC buses without series arrangements.
• Designed for high‑speed charge–discharge — Endurance characterized for repeated charge–discharge cycles (50 million cycles test condition included in series specification).
• High ripple capability at switching frequencies — Ripple current specified at both 120 Hz and 50 kHz to support low‑ and high‑frequency power stages.
• Robust thermal life — 3000 hours at 105°C under rated conditions supports reliable operation in thermally stressed applications.
• Predictable electrical parameters — Defined tan δ, leakage current formula, and low‑temperature impedance ratio for predictable behavior across operating conditions.
• RoHS compliant — Meets RoHS directive requirements (2011/65/EU, (EU)2015/863) for environmental compliance.

Why Choose LQSW6331MELC30?

The LQSW6331MELC30 combines a high 420 V rating with 330 µF capacitance in a compact snap‑in package engineered for high‑frequency regenerative and inverter applications. Its specification set—including high ripples at 50 kHz, controlled leakage and loss characteristics, and a 105°C, 3000‑hour endurance—makes it suitable for power electronics designs that require predictable bulk energy storage and thermal robustness.

This part is ideal for engineers designing AC motor drives, inverters, and rectifier stages who need a polarized aluminum electrolytic capacitor that is characterized for high‑speed charge–discharge cycles and fluctuating voltage environments while maintaining RoHS compliance.

Request a quote or submit an inquiry for pricing and availability of LQSW6331MELC30 to evaluate it for your next power electronics design.