LQSW6681MELC50

The LQSW6681MELC50 is a snap‑in terminal aluminum electrolytic capacitor designed for high speed charge‑discharge applications. It combines a 680 µF capacitance with a 420 V rated voltage and a wide operating temperature range to support demanding industrial power systems.

Optimized for high‑frequency regenerative voltage and voltage‑fluctuating environments, this capacitor is suited to AC servomotors, general inverters, rectifier circuits such as voltage doublers, and other general‑purpose industrial power equipment. It is RoHS compliant and built to provide robust performance at elevated temperature and ripple conditions.

Key Features

• Rated capacitance and voltage — 680 µF at 420 V provides bulk energy storage for power conversion and regenerative circuits.
• High temperature capability — Operating range from −25°C to +105°C with endurance specified for 3000 hours at 105°C, enabling sustained operation in hot industrial environments.
• Snap‑in radial can package — Snap‑in terminal, radial can design for secure PCB mounting and reliable mechanical retention in power assemblies.
• Charge‑discharge endurance — Designed to meet the series’ charge‑discharge endurance test: 50 million cycles (cycle conditions per datasheet) for applications with frequent energy transfer.
• Ripple current handling — Rated ripple currents of 2.2 A at 120 Hz and 3.146 A at 50 kHz to support both low and high frequency ripple environments.
• Leakage and loss characteristics — Leakage current specified by I ≤ 3√(C·V) after 5 minutes at 20°C; tangent of loss angle (tan δ) max. 0.15 at 420 V (measurement at 120 Hz, 20°C).
• Capacitance tolerance — ±20% typical tolerance at 120 Hz, 20°C for predictable sizing in power designs.
• Regulatory compliance — Compliant with RoHS directive (2011/65/EU, (EU)2015/863).
• Physical dimensions — Can package dimensions L: 5 × D: 3.5 cm with a maximum seated height of 1.969 inches for planning PCB layout and enclosure clearance.

Typical Applications

• Motor drives and servomotors — Used for high‑frequency regenerative voltage handling and energy buffering in AC servomotor drive circuits.
• Inverters and industrial power conversion — Provides bulk capacitance and ripple tolerance for general inverter topologies and power electronic stages.
• Rectifier and voltage doubler circuits — Suited to rectifier stages and voltage doubler configurations where stable DC hold and charge‑discharge endurance are required.
• Equipment operating in fluctuating voltage environments — Helps stabilize DC rails and absorb transient energy in installations subject to voltage variation.

Unique Advantages

• Engineered for high thermal stress — Specified operation to 105°C with 3000 hours endurance at that temperature, supporting long‑life performance in hot installations.
• Designed for frequent charge‑discharge — Series charge‑discharge endurance testing supports applications with rapid energy cycling, improving reliability in regenerative systems.
• Dual‑frequency ripple capability — Explicit ripple current ratings at 120 Hz and 50 kHz provide predictable performance across low and high frequency conditions.
• Secure snap‑in mounting — Snap‑in terminal design simplifies mechanical retention on PCBs used in rugged industrial assemblies.
• Clear electrical specification set — Well‑defined leakage, tan δ, tolerance and endurance limits for accurate design margining and verification.
• RoHS compliant — Meets RoHS requirements for environmental and regulatory conformity.

Why Choose LQSW6681MELC50?

The LQSW6681MELC50 from Nichicon positions itself as a robust solution for industrial power designers who need a 420 V, 680 µF capacitor capable of withstanding elevated temperatures and frequent charge‑discharge cycles. Its snap‑in package and explicit ripple and leakage specifications make it straightforward to integrate into inverter, motor drive and rectifier designs where predictable behavior under stress is essential.

For engineers and procurement teams, this part offers a balance of energy storage, thermal endurance, and mechanical reliability, backed by clear datasheet performance numbers that ease selection and validation in long‑life industrial systems.

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