LQSW6181MELA30

The LQSW6181MELA30 is a Nichicon LQS series aluminum electrolytic capacitor in a snap-in terminal can, designed for high-speed charge–discharge operation at elevated temperatures. It provides 180 µF nominal capacitance at a 420 V rated voltage with a polarization suitable for power electronics circuits.

Engineered for power-conversion environments, this part is suited to high-frequency regenerative voltages and voltage-doubler rectifier circuits where voltage fluctuation and frequent charge–discharge cycles occur, while maintaining RoHS compliance.

Key Features

• Electrical Performance: 180 µF capacitance at 420 V rated voltage with ±20% tolerance; polarized for DC power applications.
• High Ripple and Frequency Capability: Rated ripple currents of 910 mA at 120 Hz and 1.301 A at 50 kHz support high-frequency and high-ripple power stages.
• Thermal Endurance: Operating temperature range of –25 °C to +105 °C and rated endurance of 3000 hours at 105 °C under DC bias plus rated ripple current.
• Charge–Discharge Durability: Designed to meet the LQS series charge–discharge endurance specification (50 million cycles at room temperature under specified charge–discharge conditions).
• Leakage and Loss Characteristics: Leakage current meets the series criterion I ≤ 3√(C·V) (μA) after 5 minutes at 20 °C; tangent of loss angle (tan δ) for 420 V is specified at a maximum of 0.15 (measured at 120 Hz, 20 °C).
• Robust Mechanical Package: Radial can with snap-in mounting for secure PCB attachment; size approximately L: 3.0 cm × D: 2.5 cm and a seated height maximum of 1.181 inches.
• Regulatory Compliance: Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC Servomotor Drives: Handles high-frequency regenerative voltage and repeated charge–discharge events common in servo power stages.
• General Inverters: Supports inverter DC bus and energy-recovery sections where voltage fluctuation and high ripple are present.
• Rectifier / Voltage Doubler Circuits: Suited for rectifier circuits including voltage-doubler configurations that require stable high-voltage capacitance.
• Equipment in Fluctuating-Voltage Environments: Provides stable capacitance and defined endurance for systems exposed to varying supply conditions.

Unique Advantages

• High-voltage capability: 420 V rating enables use on high-voltage DC buses and rectifier outputs without series stacking.
• Designed for frequent cycling: Specified charge–discharge endurance and high ripple ratings reduce the need for over-specifying capacitance in cyclic power applications.
• Wide operating temperature: –25 °C to +105 °C rating with 3000-hour endurance at 105 °C supports thermal robustness in harsh power environments.
• Predictable leakage and loss: Leakage current and tan δ specifications allow engineers to predict standby dissipation and heating under defined conditions.
• Secure snap-in mounting: Radial snap-in package offers reliable mechanical retention for high-vibration or high-current PCB assemblies.
• RoHS compliant: Conforms to relevant RoHS directives for regulatory acceptance in global markets.

Why Choose LQSW6181MELA30?

The LQSW6181MELA30 combines high-voltage handling, elevated temperature endurance, and charge–discharge robustness in a snap-in aluminum electrolytic package from Nichicon’s LQS series. Its specified ripple current and cycle endurance make it a practical choice for power-electronics designs that require dependable bulk energy storage and tolerance to frequent high-frequency switching events.

This capacitor is well suited to engineers designing motor drives, inverters, and rectifier circuits that demand a balance of performance, predictable loss/leakage behavior, and extended operation at up to 105 °C.

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