LQSW6181MELB25

The LQSW6181MELB25 from Nichicon is a snap‑in terminal aluminum electrolytic capacitor designed for high‑speed charge–discharge applications. It is part of the LQS series and is optimized for high frequency regenerative voltages and equipment exposed to fluctuating supply voltages.

With a rated voltage of 420 V and 180 µF capacitance, this polarized, radial can snap‑in capacitor targets power electronics such as inverters, AC servomotor regen circuits and rectifier/voltage‑doubler applications where high ripple and cycling demands are present.

Key Features

• Electrical Capacity & Voltage — 180 µF capacitance at a 420 V rated voltage with ±20% tolerance, suitable for high‑voltage power circuits.
• High‑Speed Charge–Discharge — Engineered for high speed charge–discharge behavior as specified for the LQS series, making it suitable for regenerative and high‑frequency switching environments.
• Ripple Current Ratings — Rated ripple current of 910 mA at 120 Hz and 1.301 A at 50 kHz, enabling handling of both low‑frequency and high‑frequency ripple components.
• Wide Operating Temperature — Specified for operation from −25°C to +105°C to meet elevated temperature power‑electronics environments.
• Endurance & Lifetime — Endurance defined as 3000 hours at 105°C under rated DC bias plus rated ripple current; charge‑discharge endurance characterized after 50 million cycles (rated voltage + 0.35 V, 6 Hz) with defined limits on capacitance, tan δ and leakage current.
• Leakage Current Specification — Leakage current defined as I ≤ 3√CV (µA) after 5 minutes’ application of rated voltage at 20°C, providing a verifiable baseline for design calculations.
• Dissipation Factor (tan δ) — For the 420 V rating, tan δ maximum is 0.15 at 120 Hz, 20°C, enabling predictable losses in AC conditions.
• Mechanical & Mounting — Radial can, snap‑in package for secure PCB mounting in power modules and assemblies; physical size L: 2.5 × D: 3 cm for layout planning.
• RoHS Compliance — Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC Servomotor Regeneration — Used on regenerative bus circuits to absorb and release energy during motor braking and recovery where rapid charge–discharge is required.
• General Inverters — Provides bulk energy storage and ripple handling in inverter DC link stages, helping stabilize voltage during switching transients.
• Voltage‑Doubler Rectifiers — Suitable for rectifier circuits and voltage doubler configurations where high DC voltage rating and charge endurance are needed.
• Equipment in Fluctuating Voltage Areas — Applied in systems exposed to unstable or fluctuating supplies to smooth and buffer transient events.

Unique Advantages

• High Voltage Capability: 420 V rating supports high‑voltage DC link and rectifier topologies without additional series stacking.
• Designed for High‑Speed Cycling: Specified charge–discharge endurance and high ripple current ratings address demanding regenerative and switching applications.
• High‑Temperature Endurance: Rated for continuous operation up to 105°C with 3000 hours endurance, providing design margin in thermally stressed power assemblies.
• predictable Leakage and Losses: Clear leakage current formula and tan δ specification allow accurate thermal and loss budgeting in power designs.
• Robust Mounting Form Factor: Snap‑in radial can package simplifies installation in power boards and cabinet modules where secure mechanical retention is required.
• Regulatory Compliance: RoHS compliance supports inclusion in designs targeting restricted‑substance requirements.

Why Choose LQSW6181MELB25?

The LQSW6181MELB25 is positioned for designers of power conversion and motor drive systems who need a high‑voltage, high‑cycle, high‑temperature electrolytic capacitor with snap‑in mounting. Its combination of 180 µF at 420 V, high ripple capability, and documented charge–discharge endurance makes it a practical choice for regenerative and inverter DC link applications.

As part of Nichicon’s LQS series, this capacitor delivers verifiable electrical and endurance specifications—helping engineers predict system behavior, manage thermal and loss budgets, and meet RoHS requirements in production designs.

If you would like pricing, availability or technical assistance for volume projects, request a quote or contact the sales team to discuss your application requirements and lead‑time options.