LQS2W151MELB25

The LQS2W151MELB25 is a snap‑in terminal aluminum electrolytic capacitor from Nichicon’s LQS series. It provides 150 µF capacitance at a 450 V rating and is designed for high‑speed charge‑discharge applications.

Engineered for high‑frequency regenerative voltage and voltage‑fluctuating environments, this capacitor is suited for AC servomotor drives, general inverters, and rectifier circuits such as voltage doublers. It combines high ripple capability and a 105°C temperature rating for reliable operation in demanding power-electronics systems.

Key Features

• Capacitance & Voltage — Rated at 150 µF and 450 V for high-voltage DC link and energy-storage applications.
• High‑speed charge‑discharge — 105°C high speed charge‑discharge construction, suited for high frequency regenerative voltage for AC servomotor and general inverter use.
• Ripple current capability — Rated ripple current of 790 mA at 120 Hz and 1.13 A at 50 kHz, supporting both low‑ and high‑frequency ripple conditions.
• Operating temperature & lifetime — Specified for −25°C to +105°C with a rated endurance of 3000 hours at 105°C when subjected to DC bias plus rated ripple current.
• Endurance & charge‑discharge robustness — Meets charge‑discharge endurance (50 million cycles at room temperature, cycle 6 Hz with voltage difference = rated voltage + 0.35 V) with capacitance change within ±20% and leakage current within initial specified limits.
• Leakage current and dissipation — Leakage current I ≤ 3√(C·V) µA after 5 minutes at 20°C; tan δ max. 0.20 at 450 V (measured at 120 Hz, 20°C).
• Package & mounting — Radial can with snap‑in terminals (snap‑in mounting), polarized construction; physical size L: 2.5 × D: 3 cm and maximum seated height 2.5 cm.
• RoHS compliance — Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC servomotor drives — Handles high‑frequency regenerative voltage and rapid charge‑discharge cycles typical of servo systems.
• General inverters and motor controllers — Suitable for DC link and energy buffering in inverter topologies operating under fluctuating voltages.
• Voltage doubler/rectifier circuits — Sized and specified for use in rectifier circuits including voltage doublers requiring high‑voltage capacitance.
• Power electronics with fluctuating supply — Designed for equipment used in environments with voltage fluctuation where robust ripple handling and temperature endurance are required.

Unique Advantages

• Designed for high‑frequency regeneration: Explicitly suited for high frequency regenerative voltage in AC servomotor and inverter applications, reducing the need for alternative high‑rate components.
• High ripple handling across frequencies: Specified ripple currents at both 120 Hz and 50 kHz enable predictable performance in low‑ and high‑frequency conditions.
• Thermal endurance at 105°C: Rated operation to 105°C with 3000 hours of endurance under rated conditions for sustained high‑temperature reliability.
• Proven charge‑discharge robustness: Maintains capacitance within ±20% after 50 million charge‑discharge cycles (rated voltage + 0.35 V, 6 Hz), supporting long service life in cyclic applications.
• Compact snap‑in form factor: Radial snap‑in can (2.5 × 3 cm) facilitates secure PCB mounting in power assemblies requiring high‑voltage capacitors.
• Measured electrical limits: Clear leakage current and dissipation factor limits (I ≤ 3√CV µA; tan δ max. 0.20 at 450 V) allow straightforward validation during design and test.

Why Choose LQS2W151MELB25?

The LQS2W151MELB25 delivers a balance of high‑voltage energy storage, high‑frequency charge‑discharge capability, and thermal endurance in a snap‑in radial package. As part of Nichicon’s LQS series, it is targeted at power‑electronic designs—such as servo drives and inverters—where regenerative events and voltage fluctuation demand robust, long‑lived capacitors.

Designers looking for a RoHS‑compliant, polarized aluminum electrolytic with specified ripple performance, charge‑discharge endurance, and defined leakage/tan δ limits will find the LQS2W151MELB25 suited to demanding industrial power assemblies and rectifier circuits.

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