LQSW6391MELC35

The LQSW6391MELC35 is a snap‑in terminal aluminum electrolytic capacitor in Nichicon’s LQS series, optimized for high‑speed charge–discharge and high‑frequency regenerative environments. With a rated voltage of 420 V and a capacitance of 390 µF, it addresses power electronics tasks where voltage fluctuation and frequent charge cycling are present.

Designed for snap‑in mounting and rugged operation from −25°C to 105°C, this component is targeted at inverter and motor drive systems that require high ripple and cycle endurance while maintaining RoHS compliance.

Key Features

• Capacitance and Voltage: 390 µF rated at 420 V — supports high‑voltage DC bus and energy buffering in power conversion circuits.
• High‑temperature operation: Rated operating range −25°C to +105°C with endurance specified for 3000 hours at 105°C under DC bias plus rated ripple current.
• High‑speed charge–discharge endurance: Endurance validated for 50 million charge/discharge cycles (6 Hz, at room temperature under specified charge‑discharge voltage), with capacitance change within ±20% of initial value.
• Ripple current capability: Specified ripple current of 1.61 A at 120 Hz and 2.302 A at 50 kHz — suited for applications with both low and high frequency ripple content.
• Low loss (tan δ): tan δ ≤ 0.15 at 120 Hz, 20°C for the 420 V rating, supporting efficient energy transfer with controlled dissipation.
• Robust packaging and mounting: Radial can with snap‑in terminals for secure board retention and straightforward assembly.
• RoHS compliant: Manufactured in accordance with RoHS Directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor drives: Handles high‑frequency regenerative voltages and rapid charge/discharge demands in servo systems.
• General inverters and motor controllers: Serves as DC bus and energy storage where voltage can fluctuate and high ripple currents occur.
• Voltage doubler rectifier circuits: Suitable for rectifier stages that use voltage doubling topologies and require stable capacitance under repeated cycling.
• Equipment operating in fluctuating voltage environments: Provides resilient capacitance and endurance for systems exposed to variable supply conditions.

Unique Advantages

• High‑voltage capability: 420 V rating allows direct use on higher DC bus rails without additional series stacking.
• Designed for frequent cycling: Proven charge–discharge endurance (50 million cycles) reduces the need for frequent replacement in cycling applications.
• Thermal endurance: 3000 hours at 105°C under rated conditions supports reliable operation in elevated ambient temperatures.
• Broad ripple handling: Specified ripple current at both 120 Hz and 50 kHz addresses a wide range of switching and regenerative load profiles.
• Secure snap‑in layout: Snap‑in terminals and radial can package simplify mechanical retention and board assembly in power modules.
• Regulatory compliance: RoHS conformity ensures adherence to common environmental regulations for electronics manufacturing.

Why Choose LQSW6391MELC35?

The LQSW6391MELC35 combines a high 420 V rating and 390 µF capacitance with a design focused on high‑speed charge–discharge and high‑frequency regenerative environments. Its specified ripple currents, low loss characteristics, and validated endurance make it a practical choice for inverter, motor drive, and rectifier applications where reliability under cycling and temperature stress matters.

This part is suited for designers and procurement teams building power conversion systems that require robust DC bus energy storage, controlled dissipation, and snap‑in mounting for straightforward assembly and serviceability. Its RoHS compliance and documented endurance provide clear, verifiable attributes for long‑term use in demanding equipment.

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