LQSW6471MELC40

The LQSW6471MELC40 is a snap-in terminal aluminum electrolytic capacitor from Nichicon's LQS series, specified for high-speed charge–discharge applications and high-voltage systems. With a 470 µF capacitance at 420 V and a compact φ35 × 40 mm radial can, it is intended for industrial power electronics including AC servomotor drives, general inverters, and rectifier circuits such as voltage doublers where voltage fluctuation and regenerative high-frequency voltages occur.

Designed for operation from –25 °C to +105 °C and endurance tested at elevated temperature, this part provides stable performance under ripple and repeated charge–discharge stress typical of inverter and motor-control environments.

Key Features

• High Voltage Rating — 420 V rated voltage suited for inverter and motor-drive DC bus applications.
• Capacitance and Tolerance — 470 µF nominal with ±20% tolerance at 120 Hz, 20 °C for energy storage and smoothing.
• Snap-in Radial Package — Snap-in terminal, radial can (φ35 × 40 mm) for secure board mounting and robust mechanical retention.
• Wide Operating Temperature — Specified –25 °C to +105 °C to support industrial environments.
• Endurance and Lifetime — Rated for 3000 hours at 105 °C under DC bias plus rated ripple current; meets endurance requirements for sustained hot operation.
• High-Frequency and Ripple Performance — Rated ripple currents of 1.86 A at 120 Hz and 2.66 A at 50 kHz to handle both low- and high-frequency ripple in regenerative and inverter systems.
• Charge–Discharge Durability — Series-tested for charge–discharge behavior up to 50 million cycles (6 Hz, specified test conditions) with capacitance retention within specified limits.
• Leakage and Dissipation Characteristics — Leakage current meets I ≤ 3√CV (µA) after 5 minutes at 20 °C; dissipation factor (tan δ) ≤ 0.15 at 420 V (measured at 120 Hz, 20 °C).
• Polarized Component — Polarized electrolytic suitable for DC bus and rectifier circuit use.

Typical Applications

• AC Servomotor Drives — Supports high-frequency regenerative voltages and frequent charge–discharge cycles common in servo systems.
• General Inverters — Used on DC link and smoothing circuits in inverters where high voltage and ripple performance are required.
• Voltage-Doubler Rectifiers — Suitable for rectifier circuits including voltage-doubler topologies that require high-voltage capacitance.
• Equipment in Voltage-Fluctuating Areas — Provides stable capacitance and endurance where supply voltage varies or regenerative events occur.

Unique Advantages

• 420 V Capability: Enables direct use on high-voltage DC bus circuits without series arrangements.
• Designed for High-Frequency Regeneration: Ripple ratings at 50 kHz and charge–discharge endurance make it suitable for regenerative converter environments.
• High-Temperature Endurance: 3000 hours at 105 °C under rated conditions supports prolonged operation in hot enclosures.
• Proven Electrical Stability: Leakage current and tan δ limits plus low-temperature impedance ratio ensure predictable behavior across operating conditions.
• Robust Mechanical Mounting: Snap-in radial can provides a secure PCB mounting option for high-vibration industrial equipment.
• Compact Footprint: 470 µF in a φ35 × 40 mm can balances capacitance and size for constrained DC-link designs.

Why Choose LQSW6471MELC40?

The LQSW6471MELC40 combines a high 420 V rating, significant capacitance (470 µF), and design verification for high-speed charge–discharge cycling, positioning it for demanding inverter and motor-drive power electronics. Its specified ripple performance at both 120 Hz and 50 kHz, along with endurance testing (50 million charge–discharge cycles and 3000 hours at 105 °C), delivers predictable electrical characteristics and durability for industrial applications where voltage fluctuation and regenerative events are common.

Ideal for engineers designing AC servo systems, general inverters, and rectifier circuits requiring a high-voltage, snap-in electrolytic capacitor, this Nichicon LQS-series part offers a balance of electrical performance, thermal endurance, and board-mounted reliability.

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