LQS2G391MELB40

The LQS2G391MELB40 is an aluminum electrolytic capacitor in a snap-in terminal radial can designed for high-speed charge–discharge applications. It is rated 400 V with 390 µF capacitance and is built for industrial power electronics where regenerative voltages and fluctuating line conditions are present.

Engineered for use in AC servomotor regenerative circuits, general inverters and rectifier/voltage-doubler circuits, the capacitor combines high voltage handling, elevated operating temperature capability, and measurable ripple performance for robust power-stage integration.

Key Features

• Capacitance & Voltage — 390 µF nominal capacitance at 400 V rated voltage; capacitance tolerance ±20% (measured at 120 Hz, 20°C).
• High‑speed charge–discharge — Designed for high speed charge–discharge behavior and validated by the series’ charge–discharge endurance testing.
• Thermal performance & lifetime — Operating temperature range −25°C to +105°C with a rated endurance of 3000 hours at 105°C.
• Ripple current capability — Specified ripple current of 1.55 A at 120 Hz and 2.216 A at 50 kHz, suitable for demanding power conversion environments.
• Leakage current specification — Leakage current defined by I ≤ 3√(C·V) µA after 5 minutes’ application of rated voltage at 20°C, per the product datasheet.
• Loss tangent (tan δ) — tan δ specified for 400 V rating (measurement: 120 Hz, 20°C), supporting predictable dissipation characteristics in high-voltage designs.
• Mounting & package — Snap-in terminal, radial can package with compact footprint (approx. L: 4 × D: 3 cm) for PCB-mounted power assemblies.
• Regulatory — RoHS compliant (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor regenerative circuits — Handles high-frequency regenerative voltage in motor drives to stabilize DC link and manage energy flow during braking.
• General inverters — Used in inverter DC-link stages where high voltage rating and ripple tolerance are required for reliable power conversion.
• Voltage-doubler/rectifier circuits — Suitable for rectifier configurations and voltage-doubler arrangements where robust high-voltage capacitors are needed.
• Equipment in fluctuating-voltage environments — Designed to tolerate voltage fluctuation and transient stress commonly found in industrial power systems.

Unique Advantages

• High-voltage, high-capacitance solution: 400 V / 390 µF combination provides energy storage capacity required for DC-link and regenerative applications.
• Designed for frequent charge–discharge: Series-level validation includes charge–discharge endurance testing at high cycle counts to support rapid energy transfer use cases.
• Wide operating temperature window: −25°C to +105°C rating with 3000 hour endurance at 105°C supports sustained operation in elevated-temperature installations.
• Measurable ripple performance: Specified ripple current values at 120 Hz and 50 kHz give predictable thermal and electrical behavior in both low- and high-frequency environments.
• PCB-friendly snap-in package: Snap-in radial can offers secure mounting for power modules while minimizing board complexity compared with larger bus-layout options.
• RoHS compliance: Meets RoHS directive requirements for use in regulated markets.

Why Choose LQS2G391MELB40?

The LQS2G391MELB40 is positioned for engineers designing industrial power electronics that require a robust, high-voltage electrolytic capacitor with proven charge–discharge performance. Its 400 V rating, 390 µF capacitance and defined ripple current specs make it well suited for DC-link, regenerative and rectifier circuits where sustained thermal and electrical reliability is essential.

For designs needing predictable endurance at elevated temperatures and a secure snap-in mounting solution, this capacitor offers a balanced combination of voltage handling, capacitance density and datasheet-backed performance characteristics that simplify component selection for inverter and motor-drive applications.

Request a quote or submit a product inquiry to receive pricing, availability and technical assistance for integrating the LQS2G391MELB40 into your next power electronics design.