LQS2W391MELC40

The LQS2W391MELC40 is a 390 µF, 450 V snap‑in aluminum electrolytic capacitor in Nichicon’s LQS series, designed for high‑speed charge–discharge operation. Its snap‑in radial can package and polarized construction are intended for industrial power applications that demand robust high‑voltage energy storage.

Engineered for use in high‑frequency regenerative voltage environments, this part is suited to AC servomotors, general inverters, rectifier circuits (including voltage doubler configurations), and other equipment operating in areas with voltage fluctuation. The component is RoHS compliant and specified to operate from −25 °C to +105 °C with a rated endurance of 3000 hours at 105 °C.

Key Features

• High voltage rating: 450 V rated voltage for high‑voltage DC bus and power conversion applications.
• Nominal capacitance: 390 µF with ±20% tolerance, providing bulk energy storage for smoothing and regenerative bursts.
• Snap‑in radial can package: Snap‑in terminals for secure PCB mounting in power assemblies and simplified placement during assembly.
• High‑temperature operation: Specified operating range −25 °C to +105 °C with endurance of 3000 hours at 105 °C for demanding thermal environments.
• High‑speed charge–discharge endurance: Qualified for 50 million charge–discharge cycles at room temperature (series specification), making it suitable for frequent energy cycling applications.
• Ripple current capability: Rated ripple current of 1.61 A at 120 Hz and 2.302 A at 50 kHz, supporting both low‑frequency and high‑frequency ripple conditions.
• Leakage and dissipation characteristics: Leakage current and tan δ limits per series specifications (leakage I ≤ 3√(C·V) μA after 5 minutes at 20 °C; tan δ up to 0.20 at 450 V, 120 Hz, 20 °C).
• Regulatory compliance: Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor drives: Handles high‑frequency regenerative voltage and rapid charge–discharge cycles common in motion control systems.
• Inverters and motor controllers: Provides DC bus smoothing and energy buffering for general inverter topologies in industrial drives.
• Rectifier and doubler circuits: Suitable for rectifier circuits, including voltage doubler arrangements, where high DC voltage and capacitance are required.
• Industrial equipment in fluctuating‑voltage areas: Robust thermal and electrical endurance for systems exposed to unstable supply conditions.

Unique Advantages

• High‑voltage energy storage: 450 V rating enables use on higher DC bus voltages without series stacking.
• Designed for frequent cycling: Endurance for high‑speed charge–discharge and long‑term DC bias plus ripple at elevated temperature supports cyclic industrial workloads.
• Dual‑frequency ripple handling: Specified ripple current figures at both 120 Hz and 50 kHz give clear guidance for low‑ and high‑frequency power designs.
• Thermal robustness: Rated operation to 105 °C with a 3000‑hour endurance at that temperature for reliable performance in hot enclosures.
• Assembly‑friendly termination: Snap‑in terminals simplify secure mounting in power assemblies and reduce mechanical handling during production.
• Regulatory conformity: RoHS compliance for restrictive‑substance requirements in commercial and industrial products.

Why Choose LQS2W391MELC40?

The LQS2W391MELC40 combines a high 450 V rating and substantial 390 µF capacitance with a snap‑in radial package and specifications tuned for high‑speed charge–discharge operation. It is positioned for engineers specifying DC bus and regenerative energy storage in industrial power conversion systems where voltage fluctuation and frequent cycling are expected.

Built to the LQS series specifications from Nichicon, this capacitor offers clear electrical limits (ripple current at multiple frequencies, leakage current formula, tan δ), elevated temperature endurance, and RoHS compliance—attributes that help simplify component selection and support long‑term system reliability in industrial designs.

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