LQS2W121MELZ35

The LQS2W121MELZ35 from Nichicon is a snap‑in terminal aluminum electrolytic capacitor in the LQS series, rated 450 V and 120 µF. It is engineered for high‑speed charge–discharge applications and for use where regenerative or fluctuating voltages occur.

Designed for industrial power electronics, the capacitor supports high‑frequency regenerative voltage environments such as AC servomotors and general inverters, and is suitable for rectifier circuits including voltage doubler configurations. It is RoHS compliant and specified for continuous operation to 105 °C.

Key Features

• Rated capacitance and voltage: 120 µF at 450 V provides energy storage for high‑voltage power electronics and DC bus applications.
• High‑temperature operation: Specified operating range −25 °C to 105 °C with endurance of 3000 hours at 105 °C under DC bias plus rated ripple current.
• High‑speed charge–discharge capability: Engineered for rapid charge–discharge cycles; endurance testing includes 50 million charge–discharge cycles at room temperature with limits on capacitance change, tan δ and leakage current.
• Ripple current handling: Rated ripple currents of 720 mA at 120 Hz and 1.03 A at 50 kHz support both low‑ and high‑frequency ripple environments.
• Leakage current specification: Leakage current meets I ≤ 3√(C·V) µA after 5 minutes at 20 °C (series specification), enabling predictable standby behavior.
• Package and mounting: Radial can with snap‑in terminals for secure board mounting and straightforward installation in power assemblies.
• Electrical loss (tan δ): Specified tan δ limits up to 0.20 at 450 V (measurement at 120 Hz, 20 °C), supporting reliable AC performance.
• RoHS compliant: Conforms to RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor drives: Supports high‑frequency regenerative voltage handling and rapid charge–discharge cycles in motor control power stages.
• General inverters: Provides DC bus filtering and energy buffering where voltage fluctuations and regenerative currents are present.
• Rectifier and voltage doubler circuits: Suited for rectifier stages that require robust capacitive smoothing under fluctuating input conditions.
• Industrial power electronics: Appropriate for equipment operating at elevated temperatures (up to 105 °C) and subject to continuous ripple and DC bias.

Unique Advantages

• High voltage capability: 450 V rating enables use in a wide range of inverter and DC bus topologies without series stacking.
• Designed for rapid cycling: Endurance testing for charge–discharge behavior (50 million cycles) demonstrates suitability for applications with frequent energy transfer events.
• Temperature and lifetime assurance: Rated for −25 °C to 105 °C with 3000 hours endurance at 105 °C under specified conditions, supporting long operational life in hot environments.
• Measured ripple performance: Specified ripple currents at both 120 Hz and 50 kHz address real‑world ripple spectra found in power conversion systems.
• Snap‑in mechanical convenience: Snap‑in terminal format simplifies secure installation in power assemblies and reduces assembly time.
• Predictable leakage and loss behavior: Clear leakage current formula and tan δ limits allow accurate thermal and leakage budgeting in designs.

Why Choose LQS2W121MELZ35?

The LQS2W121MELZ35 combines a 450 V rating and 120 µF capacitance with a snap‑in package and specifications tailored for high‑speed charge–discharge and regenerative voltage environments. Its endurance data, ripple current ratings, and 105 °C operating capability make it well suited for industrial inverter and motor drive designs where robustness under fluctuating voltages is required.

As part of Nichicon’s LQS series, this capacitor provides designers with verifiable electrical and thermal characteristics—useful when specifying components for long‑life power electronics assemblies that demand consistent performance over time.

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