LQS2G181MELZ35

The LQS2G181MELZ35 is a snap‑in terminal aluminum electrolytic capacitor designed for high‑speed charge–discharge applications. It is a 180 µF, 400 V polarized capacitor from Nichicon’s LQS series, optimized for demanding power conversion environments.

Engineered for high‑frequency regenerative voltages and areas with fluctuating supply, this part targets AC servomotor drives, general inverters and rectifier/doubler circuits, delivering robust thermal and electrical performance up to 105°C.

Key Features

• Rated Electricals: 180 µF capacitance at 400 V with ±20% tolerance, suitable for bulk energy storage and smoothing in high‑voltage power stages.
• High‑Temperature Endurance: Rated for operation from –25°C to +105°C with endurance specified as 3000 hours at 105°C under rated conditions.
• High‑speed Charge–Discharge Capability: Specified endurance for charge–discharge behavior after 50 million cycles (rated voltage +0.35 V difference, 6 Hz) at room temperature, maintaining capacitance within ±20% of initial value.
• Ripple Current Performance: Rated ripple current of 950 mA at 120 Hz and 1.359 A at 50 kHz, supporting both low and high frequency ripple environments.
• Loss and Leakage Characteristics: Tangent of loss angle (tan δ) for 400 V is ≤0.15 at 120 Hz, and leakage current after 5 minutes at 20°C is specified as I ≤ 3√(C·V) µA (C in µF, V in V).
• Mechanical & Mounting: Snap‑in terminal, radial can package; physical size L: 3.5 × D: 2.2 cm with a seated height limit of 1.378 inches to fit industrial power assemblies.
• Regulatory Compliance: RoHS compliant (2011/65/EU, (EU)2015/863).

Typical Applications

• Industrial Motor Drives: Energy recovery and smoothing for AC servomotors where high‑frequency regenerative voltage is present.
• General Inverters: Bulk filtering and ripple handling in inverter DC bus circuits subject to fluctuating supply conditions.
• Rectifier / Voltage Doubler Circuits: DC link and charge storage for rectifier topologies, including voltage doubler arrangements.

Unique Advantages

• High‑temperature reliability: Rated performance to 105°C with 3000 hours endurance reduces risk of premature degradation in hot power assemblies.
• High cycle durability: Specified for 50 million charge–discharge cycles at room temperature, preserving capacitance and leakage characteristics for cycle‑intensive applications.
• Dual‑frequency ripple capability: Clear ripple current specifications at both 120 Hz and 50 kHz help engineers select the part for mixed‑frequency power systems.
• Compact snap‑in form factor: Radial can with snap‑in terminals provides secure PCB mounting and straightforward mechanical integration in power racks and modules.
• Measurable electrical margins: Defined tan δ and leakage current limits enable predictable thermal and loss budgeting in power system design.

Why Choose LQS2G181MELZ35?

The LQS2G181MELZ35 combines a high 400 V rating with substantial capacitance and engineered endurance for high‑frequency, high‑stress power environments. Its specified ripple currents across low and high frequencies, along with stringent loss and leakage limits, make it a reliable choice for inverter and motor drive DC link designs where voltage fluctuation and regenerative events occur.

This part is well suited to design teams and procurement seeking a proven aluminum electrolytic solution with explicit endurance and thermal specifications, RoHS compliance, and a practical snap‑in mounting style for industrial power applications.

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