LQS2G121MELZ30

The LQS2G121MELZ30 is a snap‑in terminal aluminum electrolytic capacitor from Nichicon's LQS series designed for high‑speed charge–discharge applications. It delivers 120 µF at a 400 V rating with a polarized, radial can package optimized for power electronics installations.

Engineered for use in regenerative and inverter power circuits, this capacitor is suited to AC servomotor regenerative voltage handling, general inverters, voltage‑doubler rectifier circuits and other equipment operating in fluctuating voltage environments. Key strengths include high ripple current capability, elevated temperature endurance to 105°C and RoHS compliance.

Key Features

• Capacitance & Voltage: 120 µF rated at 400 V with ±20% tolerance for DC link and energy‑buffering applications.
• High‑Temperature Operation: Specified operating range −25°C to +105°C with an endurance rating of 3000 hours at 105°C.
• High‑Speed Charge–Discharge: Snap‑in design and construction optimized for high speed charge/discharge behavior with end‑of‑life limits verified after 50 million cycles (6 Hz, δV = rated + 0.35 V).
• Ripple Current Handling: Rated ripple current of 730 mA at 120 Hz (low frequency) and 1.044 A at 50 kHz (high frequency) to support switching power and regenerative loads.
• Electrical Stability: Defined leakage current limit (I ≤ 3√CV µA after 5 minutes at 20°C) and maximum tan δ of 0.15 at 400 V for predictable loss characteristics.
• Package & Mounting: Polarized radial can with snap‑in terminals for secure PCB mounting; physical size approximately L: 3 × D: 2.2 cm.
• Regulatory Compliance: RoHS compliant (2011/65/EU, (EU)2015/863).

Typical Applications

• AC Servomotor Regenerative Circuits: Handles high‑frequency regenerative voltages encountered in servo drives to buffer energy and protect DC bus stability.
• General Inverters: Suitable for inverter DC link and smoothing duties where fluctuating voltages and frequent switching demand high ripple capability and thermal endurance.
• Voltage Doubler Rectifiers: Designed for use in rectifier circuits such as voltage doubler configurations where surge and pulsed charging are common.
• Equipment in Fluctuating Voltage Areas: Built to tolerate voltage variation and transient stress in industrial and power‑electronics environments.

Unique Advantages

• Proven charge/discharge endurance: Performance validated after extensive cyclic testing (50 million cycles) with capacitance retained within specified limits.
• Robust thermal performance: 3000 hours endurance at 105°C supports reliability in elevated temperature operating conditions.
• High ripple capability across frequencies: Explicit ripple ratings at both 120 Hz and 50 kHz reduce thermal build‑up concerns in switching applications.
• Predictable electrical parameters: Defined leakage current formula and tan δ limits enable accurate thermal and life calculations.
• Secure snap‑in mounting: Radial snap‑in can simplifies mechanical retention in power assemblies and racks.
• RoHS compliance: Meets European RoHS directives for regulatory and environmental conformity.

Why Choose LQS2G121MELZ30?

The LQS2G121MELZ30 combines a 120 µF/400 V rating with Nichicon’s LQS series engineering to address demanding power‑electronics use cases where high‑speed charge/discharge cycles, elevated temperatures and fluctuating voltages are present. Its specified ripple current performance and defined electrical limits make it straightforward to model for thermal and lifetime requirements.

This part is well suited for design engineers specifying DC link and energy‑buffer capacitors in servo drives, inverters and rectifier circuits who require predictable behavior over long endurance periods and operation up to 105°C.

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