LQR2W681MSEC

The LQR2W681MSEC is a screw-terminal aluminum electrolytic capacitor in Nichicon’s LQR series, offering 680 µF capacitance at a 450 V rating. It is a polarized, radial can-style capacitor designed for high-speed charge–discharge environments and applications that experience frequent voltage fluctuations.

Optimized for power electronics, this capacitor targets use in regenerative and inverter circuits where high-frequency ripple handling, robust endurance, and secure screw-terminal mounting are required.

Key Features

• Capacitance & Voltage: 680 µF rated capacitance at 450 V, with a tolerance of ±20% (at 120 Hz, 20°C).
• High-speed charge–discharge performance: Designed for rapid charge–discharge cycles and specified endurance of charge–discharge behavior up to 20 million cycles (ΔV = rated × 0.3, 3 Hz, room temperature).
• Ripple current capability: Specified ripple handling of 3.5 A at 120 Hz and 4.9 A at 10 kHz to support both low- and high-frequency regenerative currents.
• Endurance and lifetime: Rated for 5000 hours at 85°C under DC bias plus rated ripple current with defined limits for capacitance change, tan δ, and leakage current.
• Leakage current specification: After 5 minutes at rated voltage, leakage current is not more than 3√V μA or 5 mA, whichever is smaller (measured at 20°C).
• Operating temperature range: Specified for −25°C to +85°C operation.
• Mechanical and mounting: Radial, can-style package with screw terminals for secure connections in power assemblies; polarized design for correct DC installation.
• RoHS compliant: Conforms to RoHS Directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor regenerative circuits: Handles high-frequency regenerative voltages and frequent charge–discharge cycles encountered in motor drive systems.
• General inverters and power conversion: Provides bulk energy storage and ripple smoothing for inverter DC link and regenerative sections.
• Voltage-doubler rectifier circuits: Suited for rectifier stages where voltage fluctuation and high ripple currents are present.
• Equipment operating in fluctuating-voltage environments: Robust endurance and leakage specifications help maintain performance where supply voltages vary.

Unique Advantages

• High-voltage capability: 450 V rating enables use in medium-voltage DC link and regenerative circuits without additional series stacking.
• Designed for frequent charge–discharge: Specified endurance to 20 million charge–discharge cycles translates to predictable behavior in repetitive regenerative applications.
• Broad ripple performance: Distinct ripple current ratings at 120 Hz and 10 kHz support designs spanning line-frequency and high-frequency switching domains.
• Robust thermal specification: −25°C to +85°C operating range and 5000-hour endurance at 85°C provide a clear performance envelope for thermal design and qualification.
• Screw-terminal mounting: Secure mechanical and electrical connections simplify integration into power modules and serviceable systems.
• Measured, verifiable leakage limits: Clear leakage current formula (3√V μA or 5 mA maximum after 5 minutes at 20°C) aids in design validation and fault analysis.

Why Choose LQR2W681MSEC?

LQR2W681MSEC positions itself as a purpose-built capacitor for power electronics that require high-speed charge–discharge capability, stable ripple handling across frequencies, and endurance under elevated temperature and bias. Its screw-terminal radial can package and polarized design make it suitable for DC link, regenerative, and rectifier circuits where secure connections and predictable electrical behavior are essential.

This part is appropriate for engineers and procurement teams designing inverters, servo drives, and other power conversion equipment that must tolerate voltage fluctuation and repeated charge–discharge cycles, while relying on clear, datasheet-defined limits for lifetime, leakage, and ripple performance.

Request a quote or submit an inquiry to obtain pricing, availability, and detailed ordering information for LQR2W681MSEC. Our team can provide lead-time estimates and support integration questions for your power electronics design.