LQS2G391MELC30

The LQS2G391MELC30 is a Nichicon LQS series aluminum electrolytic capacitor in a radial can with snap-in terminals, designed for high-speed charge–discharge applications. It provides 390 µF at 400 V with a -25°C to 105°C operating range and is tailored for power-electronics use cases that demand robust high-frequency performance and voltage fluctuation tolerance.

Typical deployment areas include AC servomotor regenerative circuits, general inverters and rectifier/voltage-doubler circuits. The part is RoHS compliant and built to meet extended endurance requirements for demanding environments.

Key Features

• Capacitance & Voltage — 390 µF rated capacitance at 400 V provides energy storage for power-conversion and smoothing applications.
• High-temperature rating — Rated for operation from −25°C to +105°C with an endurance specification of 3000 hours at 105°C under rated conditions.
• Snap-in radial can package — Snap-in terminals and radial can construction for secure panel or PCB mounting in power assemblies.
• High-speed charge–discharge endurance — Qualified for extensive charge–discharge cycling (50 million cycles at specified test conditions) with post-test requirements of capacitance within ±20% and controlled tan δ and leakage behavior, supporting regenerative and cycling applications.
• Ripple current capability — Rated ripple current of 1.55 A at 120 Hz and 2.216 A at 50 kHz, enabling reliable handling of both low- and high-frequency ripple in power circuits.
• Leakage and dissipation characteristics — Leakage current limited by I ≤ 3√CV (μA) after 5 minutes at 20°C; tangent of loss angle (tan δ) ≤ 0.15 at 120 Hz for the 400 V rating.
• Low-temperature performance — Impedance stability characterized with Z(−25°C)/Z(+20°C) ratio up to 8 (for 350–450 V range), supporting operation in voltage-fluctuating environments.
• Regulatory compliance — Conforms to RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor regenerative systems — Handles high-frequency regenerative voltage and repetitive charge–discharge cycles in motor drive circuitry.
• General inverters — Provides bulk energy storage and ripple handling for inverter DC-link and smoothing stages.
• Voltage-doubler and rectifier circuits — Suited for rectifier circuits, including voltage-doubler topologies, where voltage fluctuation tolerance is required.
• Power electronics in fluctuating-voltage environments — Robust temperature and endurance specs support equipment exposed to variable supply conditions.

Unique Advantages

• High energy density at elevated voltage — 390 µF at 400 V provides substantial DC-link capacitance in a compact snap-in can form factor, simplifying power-stage design.
• Designed for rapid charge–discharge cycling — Validated for tens of millions of cycles under specified test conditions, reducing risk of premature performance degradation in regenerative systems.
• Broad frequency ripple capability — Specified ripple ratings at both 120 Hz and 50 kHz enable predictable thermal and electrical performance across common power-conversion frequencies.
• Extended thermal endurance — 3000 hours at 105°C endurance rating supports long-term reliability in high-temperature applications.
• Predictable leakage and dissipation behavior — Clear leakage current limit (I ≤ 3√CV) and tan δ specification for 400 V allow engineers to model standby and loss budgets accurately.
• RoHS-compliant construction — Meets contemporary environmental requirements for system-level compliance.

Why Choose LQS2G391MELC30?

The LQS2G391MELC30 positions itself as a reliable power-electronics capacitor for designers needing 400 V DC-link energy storage with proven charge–discharge endurance and high-temperature capability. Its snap-in radial can form factor combines secure mounting with serviceable performance for inverters, motor drives and rectifier circuits operating in fluctuating-voltage environments.

Manufactured by Nichicon, this capacitor offers clear, test-backed electrical and thermal characteristics—ripple current ratings at multiple frequencies, controlled leakage behavior, and a defined endurance life—that help simplify thermal design and lifetime forecasting for industrial power systems.

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