LQS2W391MELB50

The LQS2W391MELB50 is a 390 µF, 450 V aluminum electrolytic capacitor in a snap‑in radial can optimized for high‑speed charge‑discharge applications. It is a 105°C rated, polarized snap‑in terminal type designed for power electronics environments where high frequency regenerative voltages and voltage fluctuations are present.

Typical use cases include AC servomotor drives, general inverters, regenerative circuits, and rectifier stages such as voltage doubler topologies. The part is RoHS compliant and engineered for robust performance in industrial power systems.

Key Features

• High voltage rating — 450 V rated voltage suitable for high‑voltage DC link and power converter circuits.
• Capacitance & tolerance — 390 µF with ±20% tolerance (measured at 120 Hz, 20°C), providing defined energy storage for smoothing and regenerative tasks.
• 105°C temperature capability — Operates across –25°C to +105°C, enabling reliable performance in heated or enclosed industrial environments.
• High‑speed charge/discharge endurance — Series‑level qualification includes endurance for 50 million charge/discharge cycles (6 Hz, room temperature) with capacitance maintained within ±20% of initial value.
• Long endurance at elevated temperature — Rated for 3000 hours at 105°C under DC bias plus rated ripple current with specified limits on capacitance change, tan δ, and leakage current.
• Snap‑in radial package — Snap‑in can package for secure PCB mounting in power assemblies and easy installation during assembly.
• Ripple current capability — Specified ripple current: 1.61 A at 120 Hz and 2.302 A at 50 kHz, supporting high frequency inverter and regenerative applications.
• Controlled electrical characteristics — Leakage current limited by I ≤ 3√(C·V) μA after 5 minutes at 20°C; tan δ specification up to 0.20 at 450 V (120 Hz, 20°C).
• RoHS compliant — Meets RoHS directives (2011/65/EU, (EU)2015/863), supporting regulatory requirements for electronic equipment.

Typical Applications

• AC servomotor drives — Handles high‑frequency regenerative voltages and rapid charge/discharge cycles in motor control systems.
• General inverters — Provides DC link smoothing and energy buffering for inverter stages under fluctuating supply conditions.
• Regenerative braking circuits — Supports high‑speed charge/discharge and sustained ripple current in energy recovery paths.
• Rectifier and voltage doubler circuits — Suited for rectifier circuits including voltage doubler topologies that experience voltage swings and high ripple.

Unique Advantages

• High voltage & high temperature capability: 450 V rating combined with –25°C to +105°C operation gives designers headroom for demanding industrial power designs.
• Designed for high‑frequency use: Specified ripple current at both low and high frequencies (120 Hz and 50 kHz) makes it suitable for modern inverter and regenerative applications.
• Proven endurance: Series endurance tests for millions of charge/discharge cycles and 3000 hours at 105°C demonstrate predictable life behavior under stress.
• Snap‑in packaging for assembly: Radial, snap‑in can simplifies board mounting in power modules and reduces assembly complexity.
• Measured electrical limits: Defined leakage current formula (I ≤ 3√CV) and tan δ limits provide verifiable performance metrics for design verification.
• Regulatory compliance: RoHS conformity supports deployment in regions with substance restriction requirements.

Why Choose LQS2W391MELB50?

The LQS2W391MELB50 positions itself as a robust energy storage component for industrial power electronics, combining a 450 V rating, substantial capacitance (390 µF), and a 105°C operating temperature. Its snap‑in radial package and explicit ripple current and endurance specifications make it well suited to inverter, motor drive, and regenerative energy applications where repeated high‑speed charge/discharge cycles occur.

For designers and procurement teams building or maintaining power converter systems, this capacitor delivers verifiable electrical parameters, long‑term endurance data, and RoHS compliance to support reliable designs and regulatory needs.

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