LQS2G181MELB25

The LQS2G181MELB25 from Nichicon is a snap‑in terminal aluminum electrolytic capacitor in the LQS series designed for high‑speed charge–discharge applications. It is a polarized, radial can capacitor rated 400 V with 180 µF capacitance and a maximum operating temperature of 105°C.

Engineered for power electronics, this part is suited to high‑frequency regenerative voltages found in AC servomotors and general inverters, voltage‑fluctuating environments, and rectifier circuits such as voltage doublers. It is RoHS compliant.

Key Features

• High voltage rating — Rated for 400 V DC, suitable for medium‑voltage power electronics and inverter systems.
• Nominal capacitance — 180 µF with ±20% tolerance at 120 Hz, 20°C for energy storage and smoothing tasks.
• High temperature endurance — Rated to 105°C with an endurance specification of 3000 hours at 105°C under DC bias plus rated ripple current.
• High‑speed charge–discharge — Designed for repeated rapid charge/discharge cycles; series specification includes endurance for 50 million cycles (charge‑discharge conditions defined in the datasheet).
• Ripple current capability — Specified ripple current: 950 mA at 120 Hz (low frequency) and 1.359 A at 50 kHz (high frequency), supporting ripple handling across frequency ranges.
• Low‑loss electrical behavior — Tangent of loss angle (tan δ) max 0.15 at 400 V (measured at 120 Hz, 20°C).
• Leakage current specification — Leakage current meets I ≤ 3√(C·V) µA after 5 minutes application of rated voltage at 20°C (C in µF, V in V).
• Mounting — Snap‑in terminal, radial can package for board‑level power assemblies.
• RoHS compliance — Meets RoHS directive requirements (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 — Energy smoothing and regenerative energy absorption in inverter DC link and power conditioning circuits.
• Voltage doubler/rectifier circuits — Suited for rectifier topologies and voltage doubler configurations requiring stable capacitance under fluctuating voltages.
• Voltage‑fluctuating environments — Reliable operation where supply voltage varies, thanks to designed endurance under repeated charge/discharge stress.

Unique Advantages

• Engineered for rapid cycling: Endurance testing includes 50 million charge–discharge cycles, helping designs that require frequent energy transfers.
• Wide temperature operation: Rated for −25°C to 105°C, enabling use across a broad set of ambient conditions common in industrial power equipment.
• Defined leakage and loss limits: Leakage current and tan δ limits provide predictable behavior for power system modeling and lifetime estimates.
• Frequency‑span ripple handling: Specified ripple current at both 120 Hz and 50 kHz supports designers addressing low‑ and high‑frequency ripple sources.
• Proven endurance specification: 3000 hours at 105°C with DC bias plus rated ripple current yields a clear baseline for long‑term reliability planning.

Why Choose LQS2G181MELB25?

The LQS2G181MELB25 combines a high 400 V rating, substantial 180 µF capacitance, and a snap‑in radial can package tailored for power electronics assemblies that require repeated high‑speed charge and discharge cycles. Its defined ripple current ratings and endurance data make it suitable for engineers designing inverters, motor drives, and rectifier circuits that operate in voltage‑fluctuating environments.

This part is best suited to designs where predictable electrical behavior and thermal endurance are required—providing clear, datasheet‑backed parameters for leakage, tan δ, and life‑test performance to support robust BOM and reliability decisions.

Request a quote or submit an inquiry to receive pricing and availability for the LQS2G181MELB25 and to discuss how it fits your power‑electronics design requirements.