LGX2W391MELC40

The LGX2W391MELC40 is a 390 µF, 450 V aluminum electrolytic capacitor in a snap-in, radial can package. It is part of Nichicon’s LGX series designed for long-life performance at elevated temperatures.

Engineered for power electronic applications such as rectifier circuits in inverters and switching power supplies, this component combines high-voltage capability, elevated temperature endurance, and a compact footprint for space-conscious power designs. It is RoHS compliant.

Key Features

• Capacitance & Rated Voltage: 390 µF nominal capacitance with a 450 V rated voltage, suitable for high-voltage filtering and energy storage in power stages.
• High-temperature Long Life: Rated for operation to 105°C with an endurance specification of 5000 hours at 105°C under DC bias plus rated ripple current.
• Snap-in Radial Can Package: Snap-in terminal mounting for secure board retention and quick assembly in power supply assemblies.
• Temperature Range: Operating range from −25°C to +105°C, enabling use across typical industrial ambient conditions.
• Ripple Current Performance: Rated ripple current of 1.73 A at 120 Hz and 2.474 A at 50 kHz, supporting both low- and higher-frequency ripple environments.
• Endurance and Shelf Life Specifications: After 5000 hours at 105°C the capacitor meets capacitance change within ±20%, tan δ ≤200% of initial spec, and leakage current ≤ initial value; shelf life tested for 1000 hours at 105°C yields capacitance change within ±15% and tan δ ≤150% of initial spec after voltage treatment.
• Electrical Characteristics: Capacitance tolerance ±20%; leakage current defined by I ≤ 3√(C·V) µA after 5 minutes at 20°C; tan δ maximum 0.20 for 450 V parts at 120 Hz, 20°C.
• Low-temperature Stability: Impedance ratio Z(−25°C)/Z(+20°C) up to 8 for 400–500 V ratings, providing predictable behavior in colder starts.
• RoHS Compliance: Conforms to RoHS directives (2011/65/EU, (EU)2015/863).
• Compact Size: Smaller-sized radial can with dimensions L: 4 × D: 3.5 cm, enabling space-efficient placement in power assemblies.

Typical Applications

• Rectifier circuits for inverters: Provides bulk filtering and smoothing of rectified DC in inverter front ends where 450 V ratings and long-life under heat are required.
• Switching power supplies: Used for high-voltage smoothing and energy storage in SMPS designs, benefiting from the LGX series’ long-life endurance at 105°C.
• General-purpose high-voltage filtering: Suitable for power electronics and industrial power modules requiring polarized, high-voltage capacitors with robust ripple handling.

Unique Advantages

• 450 V rating for high-voltage power stages: Supports designs requiring elevated DC bus voltages without series stacking.
• Proven 105°C endurance: 5000-hour rating at 105°C under rated ripple current gives designers predictable lifetime performance in hot environments.
• Balanced ripple capability: Specified ripple currents at both 120 Hz and 50 kHz accommodate a range of rectifier and switching-frequency conditions.
• Compact snap-in format: Radial can, snap-in terminals provide secure mechanical retention and a smaller footprint for dense power boards.
• Clear electrical limits and characterization: Defined leakage current formula, tan δ limits, and low-temperature impedance ratios help with simulation and margin planning.
• RoHS compliance: Meets contemporary environmental requirements for electronics assemblies.

Why Choose LGX2W391MELC40?

The LGX2W391MELC40 positions itself as a practical choice for engineers designing high-voltage power stages that require stable capacitance, long operational life at elevated temperatures, and compact snap-in packaging. Its combination of 450 V rating, 390 µF capacitance, and 5000-hour endurance at 105°C addresses common reliability and space constraints in inverter and switching supply designs.

For teams focused on robust performance and predictable end-of-life behavior, this Nichicon LGX-series capacitor delivers specified electrical characteristics (leakage, tan δ, impedance ratios) and RoHS compliance to support manufacturable, serviceable power electronics designs.

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