LNU2G183MSEJ

The LNU2G183MSEJ from Nichicon is a screw-terminal aluminum electrolytic capacitor specified at 18,000 µF and 400 V DC with a –40 °C to +105 °C operating range. It is part of the LNU series designed for high-voltage, high-frequency industrial power applications where compact size and robust charge–discharge behavior are required.

Typical use cases include industrial power supplies, inverter circuitry and regenerative voltage environments for AC servomotors and general inverters. The part delivers high ripple-current capability and a rated load life of 5,000 hours at 105 °C under applied ripple, while meeting RoHS requirements.

Key Features

• Capacitance & Voltage — Rated capacitance 18,000 µF with a nominal voltage of 400 V DC; series rated voltage range extends up to DC 525 V.
• High Ripple Current Capability — Supports 38 A ripple current at 120 Hz and 53.2 A at 10 kHz, enabling use in high-power, high-frequency circuits.
• Temperature and Lifetime — Operates from –40 °C to +105 °C with a specified load life of 5,000 hours at 105 °C when subjected to rated ripple current and DC bias.
• Endurance & Charge–Discharge Robustness — Meets endurance requirements after long-term DC bias plus ripple application and withstands extended charge–discharge cycling as defined in the series datasheet.
• Stability at Low Temperature — Impedance ratio Z(–40 °C)/Z(+20 °C) specified (max. 8) for maintained performance in cold conditions.
• Leakage & Insulation — Leakage current defined by 3√(C·V) µA or 5 mA limit after 5 minutes at 20 °C; insulation resistance greater than 100 MΩ at DC 500 V between terminal and bracket.
• Package & Mounting — Radial can with screw terminals for secure screw-terminal mounting in industrial assemblies; polarized construction.
• Regulatory Compliance — Compliant to the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• Industrial Power Supplies — Bulk energy storage and smoothing in inverter-fed power supplies where high capacitance and voltage are required.
• Motor Drives & Inverters — DC-link and regenerative circuits for AC servomotors and general inverter systems that demand high ripple-current and charge–discharge endurance.
• High-Frequency Regenerative Systems — Applications with rapid charge–discharge cycles and high-frequency regenerative voltage where durability and low impedance are important.

Unique Advantages

• High Energy Density at High Voltage: 18,000 µF at 400 V gives substantial energy storage capacity for demanding DC-link applications.
• Designed for High Ripple Environments: Explicit ripple-current ratings at both 120 Hz and 10 kHz support designs with significant AC stress on the capacitor.
• Robust Thermal Endurance: Rated for 5,000 hours at 105 °C under applied ripple and DC bias, supporting long-term operation in hot industrial environments.
• Low-Temperature Performance: Specified impedance ratio ensures predictable behavior down to –40 °C for systems that see wide ambient temperature swings.
• Screw-Terminal Security: Radial can with screw terminals provides a mechanically secure connection for high-current industrial assemblies.
• RoHS Compliant: Meets current RoHS directives for environmentally restricted substances.

Why Choose LNU2G183MSEJ?

The LNU2G183MSEJ positions itself as a high-capacitance, high-voltage solution from Nichicon’s LNU series for industrial power electronics. Its combination of 18,000 µF at 400 V, high ripple-current capability, and 5,000-hour endurance at 105 °C makes it suitable for DC-link, inverter, and regenerative applications that require stable performance under thermal and electrical stress.

Engineers specifying this part will benefit from measurable, verifiable performance: defined leakage and insulation limits, impedance stability across temperature, and charge–discharge endurance. These attributes make the LNU2G183MSEJ a practical choice for industrial designers seeking long-term robustness and predictable behavior in high-voltage power systems.

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