LQS2G681MELC45

The LQS2G681MELC45 is a snap‑in terminal aluminum electrolytic capacitor designed for high‑speed charge/discharge applications. It offers 680 µF capacitance at a 400 V rating with a 105°C maximum operating temperature, tailored for power electronics that demand robust high‑frequency performance.

Engineered for use in environments with fluctuating voltages, this capacitor is suited for high‑frequency regenerative lines, inverters and rectifier circuits where reliable ripple handling and long endurance are required.

Key Features

• Capacitance & Voltage — 680 µF nominal capacitance with a 400 V rated voltage and ±20% capacitance tolerance at 120 Hz, 20°C.
• High‑Temperature Operation — Rated for operation from −25°C to +105°C with a rated endurance of 3000 hours at 105°C.
• High‑Speed Charge‑Discharge Endurance — Designed for charge/discharge endurance testing up to 50 million cycles (rated voltage +0.35 V, 6 Hz cycle) with performance limits specified for capacitance change, tan δ and leakage current.
• Ripple Current Performance — Specified ripple current of 2.12 A at 120 Hz and 3.032 A at 50 kHz, supporting both low‑ and high‑frequency ripple environments.
• Low‑Temperature Stability — Impedance stability characterized with Z(−25°C)/Z(+20°C) ≤ 8, supporting operation in colder ambient conditions.
• Leakage Current Specified — Leakage current limited to I ≤ 3√(C·V) μA after 5 minutes at 20°C (C: µF, V: rated voltage), providing predictable bias behavior.
• Package & Mounting — Radial can with snap‑in terminals for secure board mounting and robust power connections; polarized construction.
• Compliance — RoHS compliant (2011/65/EU, (EU)2015/863).
• Physical Size — Body dimensions: L: 4.5 × D: 3.5 cm, suitable for typical power‑electronics assemblies.

Typical Applications

• AC Servomotor Regenerative Circuits — Handles high‑frequency regenerative voltages common in servo drives and motion controllers.
• General Inverters — Provides bulk energy storage and ripple suppression in inverter DC bus and power stages.
• Voltage‑Fluctuating Equipment — Suited for systems operating in environments with unstable input voltages that require robust voltage buffering.
• Rectifier / Voltage Doubler Circuits — Designed for use in rectifier stages, including voltage‑doubler configurations, where sustained charge/discharge is required.

Unique Advantages

• High Voltage Handling: 400 V nominal rating enables direct use in medium‑voltage DC bus and inverter circuits.
• High‑Temperature Durability: 105°C rating and 3000 hours endurance at 105°C deliver predictable life under elevated operating temperatures.
• Designed for Repetitive Charge/Discharge: Specified endurance to 50 million charge/discharge cycles supports applications with frequent regenerative events.
• Broad Frequency Ripple Capability: Defined ripple current at both 120 Hz and 50 kHz supports low‑ and high‑frequency power designs.
• Robust Mounting: Snap‑in terminal radial can construction provides a secure mechanical and electrical connection for high‑current applications.
• Regulatory Compliance: RoHS compliance simplifies selection for markets requiring restricted‑substance conformance.

Why Choose LQS2G681MELC45?

The LQS2G681MELC45 delivers a balanced combination of high voltage capability, high‑temperature rating and charge/discharge endurance, making it well suited for power‑electronics designs such as inverters, servo drives and rectifier circuits exposed to fluctuating voltages. Its specified ripple performance at both low and high frequencies and controlled leakage behavior provide predictable integration into DC bus and energy‑buffering stages.

Engineered within Nichicon’s LQS series, this capacitor offers engineering teams a reliable component choice when long‑term thermal endurance, repetitive charge/discharge reliability and snap‑in mounting are design priorities.

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