LNUN7681MSEF

The LNUN7681MSEF from Nichicon is a screw‑terminal aluminum electrolytic capacitor in the LNU series designed for high‑voltage industrial power applications. It delivers 680 µF capacitance at a rated voltage of DC 525 V in a compact, radial can with screw terminals.

Engineered for inverter and regenerative circuits, this capacitor combines high voltage capability, smaller size compared with LNT series, and a load life rated for demanding thermal and ripple environments up to 105°C.

Key Features

• Electrical Performance — 680 µF nominal capacitance with ±20% tolerance and a rated voltage of DC 525 V, suitable for high‑voltage power stages.
• High‑Temperature Endurance — Rated for operation from −40°C to +105°C with a load life of 5000 hours when subjected to rated ripple at 105°C.
• High Ripple and HF Capability — Ripple current handling of 4.4 A at 120 Hz and 6.16 A at 10 kHz; designed to cope with high‑speed charge–discharge loading and high‑frequency regenerative voltages.
• Mechanical & Mounting — Radial can with screw terminals for secure, low‑impedance connections; physical size L: 8.5 × D: 5.1 cm and maximum seated height of 3.346 inch.
• Reliability & Safety Tests — Insulation resistance greater than 100 MΩ at DC 500 V between terminal and bracket; voltage proof of AC 2500 V for 1 minute between terminal and bracket; leakage current limited to 3√(C·V) µA or 5 mA (whichever is smaller) after 5 minutes at 20°C.
• Series Characteristics — Smaller footprint than LNT series while providing rated voltage range up to DC 525 V and suitability for industrial inverter/regenerative applications.
• Environmental Compliance — RoHS compliant (2011/65/EU, (EU)2015/863).

Typical Applications

• Industrial Power Supplies (Inverter Circuitry) — Energy storage and smoothing in inverter front‑ends where high DC voltages and robust ripple handling are required.
• AC Servomotor Regenerative Systems — Support for high‑frequency regenerative voltage handling in servo drives and motion control applications.
• General Inverter Systems — Bulk capacitance and charge‑discharge endurance for inverters used in industrial drives and power conversion.
• High‑Speed Charge–Discharge Circuits — Suitable for circuits that require frequent charge/discharge cycling; designed to meet endurance of 50 million charge–discharge cycles at specified conditions.

Unique Advantages

• High Voltage Capability: Rated to DC 525 V, enabling use in higher‑voltage inverter and power conversion designs.
• Compact Form Factor: Smaller sized than LNT series models while maintaining high voltage and capacitance, helping reduce board and enclosure space.
• Long High‑Temperature Life: 5000 hours of rated ripple life at 105°C provides predictable service life in elevated thermal environments.
• Robust Ripple Handling: Specified ripple currents at both low (120 Hz) and high (10 kHz) frequencies support a wide range of switching and regenerative conditions.
• Secure Screw‑Terminal Mounting: Screw terminals offer reliable electrical and mechanical connections for industrial installations.
• Low‑Temperature Stability: Maintains performance across −40°C to +105°C with an impedance ratio specification for low‑temperature operation.

Why Choose LNUN7681MSEF?

LNUN7681MSEF positions itself as a practical, specification‑driven choice for engineers designing industrial inverter, servo drive, and regenerative power systems that require high DC voltage handling, robust ripple performance, and long life at elevated temperatures. Its screw‑terminal radial can and compact dimensions simplify integration into power modules and cabinet‑level assemblies.

For design teams needing a Nichicon LNU‑series capacitor that balances high voltage capability (up to DC 525 V), proven endurance (5000 hours at 105°C under rated ripple), and high‑frequency performance, the LNUN7681MSEF delivers verifiable electrical and mechanical characteristics suitable for industrial power electronics.

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