LQSW6181MELZ40

The LQSW6181MELZ40 is a snap‑in terminal aluminum electrolytic capacitor from Nichicon's LQS series designed for high‑speed charge–discharge applications. With a rated voltage of 420 V and 180 µF capacitance, it targets power electronics and inverter systems that require reliable high‑frequency regenerative handling and voltage fluctuation tolerance.

Engineered for demanding environments, the device combines high ripple capability and 105 °C operating temperature with a rugged snap‑in can package suitable for general purpose industrial power designs.

Key Features

• Rated Performance: 180 µF capacitance at 420 V, with ±20% tolerance at 120 Hz, 20 °C—sized for energy storage and smoothing in medium‑voltage power stages.
• High‑Temperature Operation: Specified for operation from −25 °C to +105 °C with endurance tested for 3000 hours at 105 °C under DC bias plus rated ripple current.
• High‑Frequency Charge‑Discharge Endurance: Designed for high‑speed charge/discharge; validated for 50 million charge‑discharge cycles (cycle conditions defined in the series datasheet) with capacitance, tan δ and leakage within specified limits.
• Ripple Current Capability: Rated ripple current of 910 mA at 120 Hz and 1.301 A at 50 kHz, supporting AC ripple and regenerative currents in inverters and motor drives.
• Low‑Temperature Stability: Impedance ratio Z(−25 °C)/Z(+20 °C) ≤ 8 for the rated voltage range, maintaining performance in cooler ambient conditions.
• Robust Leakage & Loss Characteristics: Leakage current specification I ≤ 3√(C·V) µA after 5 minutes at 20 °C; tan δ (loss tangent) max 0.15 at 420 V (measured at 120 Hz, 20 °C).
• Mounting & Package: Snap‑in radial can package for secure PCB mounting in high‑power assemblies; polarized design for DC applications.
• RoHS Compliance: Meets RoHS requirements (2011/65/EU, (EU)2015/863).

Typical Applications

• AC Servomotor Drives: Handles high‑frequency regenerative voltage and rapid charge/discharge cycles in servo inverter systems.
• General Inverters: Energy storage and smoothing in inverter rectifier circuits where voltage can fluctuate.
• Voltage Doubler Rectifiers: Suited for rectifier circuits of voltage doublers that require elevated DC link capacitance at medium voltages.
• Industrial Power Electronics: General‑purpose use in equipment exposed to fluctuating supply voltages and demanding thermal conditions.

Unique Advantages

• High ripple handling: Distinct ripple current ratings at both low and high frequencies enable reliable performance across a range of switching and regenerative conditions.
• Thermal endurance: 3000‑hour endurance at 105 °C under rated stress ensures predictable lifetime in hot industrial environments.
• Charge‑discharge durability: Proven to withstand extensive charge/discharge cycling (50 million cycles at specified conditions) while meeting capacitance and leakage requirements.
• Stable low‑temperature behavior: Controlled impedance increase at −25 °C (Z ratio ≤ 8) preserves functional filtering and smoothing in cooler conditions.
• Secure snap‑in mounting: Radial snap‑in can simplifies installation in power assemblies and provides mechanical stability for high‑current applications.
• Regulatory compliance: RoHS conformity supports regulatory requirements for assembly and procurement.

Why Choose LQSW6181MELZ40?

The LQSW6181MELZ40 is positioned for power designers who need a medium‑voltage electrolytic capacitor that combines high ripple capability, thermal endurance, and robust charge‑discharge performance. Its 420 V rating and 180 µF capacitance deliver the DC link energy storage and smoothing required in inverter, motor drive, and rectifier applications, while the snap‑in package eases integration into industrial PCBs.

This part suits engineering teams focused on reliable long‑term operation in voltage‑fluctuating environments and high‑frequency regenerative systems. Backed by Nichicon's LQS series specifications, it provides verifiable endurance and loss characteristics for predictable system behavior over time.

Request a quote or contact our sales team to discuss availability, pricing, and lead times for LQSW6181MELZ40 and to get application‑level guidance for your design requirements.