LQSW6391MELB40

The LQSW6391MELB40 is a Nichicon LQS series aluminum electrolytic capacitor in a snap‑in terminal, can-style package. It provides 390 µF capacitance at a 420 V rating with polarized construction and is designed for high-speed charge–discharge use in power electronics.

Optimized for regenerative and inverter environments, this capacitor suits AC servomotor regenerative voltage, general inverter systems, voltage-doubled rectifiers and equipment operating in areas with fluctuating supply voltage. It is RoHS compliant and built for elevated temperature operation up to 105°C.

Key Features

• High Voltage Rating — 420 V rated voltage for use in medium‑voltage power electronics and inverter circuits.
• Capacitance & Tolerance — 390 µF nominal capacitance with ±20% tolerance at 120 Hz, 20°C.
• High Temperature Operation — Specified to operate from –25°C to +105°C, supporting applications with elevated ambient temperatures.
• Snap‑In Terminal Package — Radial, can snap‑in mounting for secure board retention and straightforward power-rail installation.
• High Speed Charge–Discharge Endurance — Designed for charge–discharge behavior endurance, including evaluation after 50 million cycles (rated voltage + 0.35 V, 6 Hz) per series specification.
• Long Endurance at Elevated Temperature — Meets endurance criteria after 3000 hours at 105°C under D.C. bias plus rated ripple current (series-level specification).
• Ripple Current Capability — Rated ripple current: 1.61 A at 120 Hz and 2.302 A at 50 kHz (series-level values provided for this part).
• Leakage and Dissipation Characteristics — Leakage current specified as I ≤ 3√(C·V) µA after 5 minutes at 20°C; tan δ max 0.15 for 420 V rating (measured at 120 Hz, 20°C).
• RoHS Compliance — Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC Servomotor Regenerative Circuits — Handles high-frequency regenerative voltage spikes and repeated charge–discharge cycles in motor drive systems.
• General Inverters — Provides bulk energy storage and ripple filtering in inverter DC-link and power-conditioning stages.
• Voltage Doubler Rectifiers — Suited for rectifier circuits that use voltage-doubling topologies requiring stable high-voltage capacitance.
• Equipment in Fluctuating Voltage Environments — Designed for systems exposed to unstable supply conditions where robust voltage endurance and temperature stability are required.

Unique Advantages

• 420 V Capability: Enables use in medium-voltage power topologies without additional series stacking.
• High Temperature Reliability: Rated to +105°C with specified endurance (3000 hours at 105°C), supporting long-term operation in hot enclosures.
• Snap‑In Mechanical Stability: Snap-in can package simplifies installation and secures the capacitor on power PCBs subject to vibration and handling.
• Designed for High-Frequency Regeneration: Optimized for high-speed charge–discharge cycles and regenerative voltage stresses typical in motor drives and inverters.
• Measured Ripple Performance: Provided ripple current values at both low and high frequencies to help verify thermal and ripple handling in your design.
• RoHS Compliant: Conforms to current RoHS requirements for use in regulated markets.

Why Choose LQSW6391MELB40?

The LQSW6391MELB40 combines a 420 V rating, substantial 390 µF capacitance and high-temperature endurance to address demanding power-electronics applications such as inverters, regenerative motor drives and voltage-doubler rectifiers. Its snap‑in can package offers practical board mounting and mechanical stability while the electrical characteristics—ripple ratings, leakage limits and tan δ—support predictable performance under stress.

This capacitor is well suited for engineers and procurement teams specifying robust bulk energy storage for power rails that experience frequent charge–discharge events, voltage fluctuations and elevated operating temperatures. The series-level endurance data and RoHS compliance support long-term deployment and regulatory needs.

Request a quote or submit a sales inquiry for LQSW6391MELB40 to evaluate its fit for your power-electronics designs and to obtain ordering or availability information.