LQSW6471MELB45

The LQSW6471MELB45 is a snap‑in terminal aluminum electrolytic capacitor from Nichicon’s LQS series. It delivers 470 µF at 420 V with a 105°C rating and is designed for high speed charge–discharge duty.

This part is targeted at power electronics where high‑frequency regenerative voltage, fluctuating line voltages, or voltage‑doubler rectifier circuits are present—examples include AC servomotor drives and general inverters.

Key Features

• Capacitance & Voltage  470 µF rated capacitance at 420 V provides bulk energy storage for high‑voltage power circuits.
• High Temperature Rating  Rated for operation from −25°C to +105°C, with endurance specified for 3000 hours at 105°C under DC bias plus rated ripple current.
• High Speed Charge–Discharge  Designed for high speed charge–discharge behavior; specified to withstand 50 million charge–discharge cycles at room temperature with defined limits on capacitance change, tan δ and leakage current.
• High‑Frequency Capability  Ripple current specified at both low and high frequency: 1.86 A at 120 Hz and 2.66 A at 50 kHz, suitable for high‑frequency regenerative and inverter applications.
• Leakage Current Specification  Leakage current meets I ≤ 3√(C·V) µA after 5 minutes’ application of rated voltage at 20°C (C = µF, V = V), allowing predictable DC leakage behavior.
• Snap‑In Mounting, Radial Can  Snap‑in terminal package for secure PCB mounting in power assemblies; radial can construction for conventional power board layouts.
• RoHS Compliant  Conforms to the RoHS directive (2011/65/EU, (EU)2015/863).
• Size  Physical footprint specified as L: 4.5 × D: 3 cm for straightforward mechanical integration.

Typical Applications

• AC Servomotor Drives  Suited for high‑frequency regenerative voltage handling in motor drive systems where rapid charge–discharge cycles occur.
• General Inverters and Power Converters  Used in inverter front‑end and DC bus circuits that require high voltage bulk capacitance and high‑frequency ripple capability.
• Equipment in Fluctuating Voltage Areas  Designed for systems exposed to voltage variations, providing stable capacitance under fluctuating line conditions.
• Rectifier Circuits (Voltage Doubler)  Applicable to rectifier stages such as voltage doubler configurations where elevated DC voltages and charge‑discharge demands are present.

Unique Advantages

• Designed for High‑Speed Duty: Specified for high speed charge–discharge cycles (endurance test: 50 million cycles), helping maintain performance in regenerative applications.
• High Voltage, High Temperature Capability: 420 V rating combined with a −25°C to +105°C operating range and 3000 hours endurance at 105°C provides reliable operation in demanding thermal environments.
• Dual‑Frequency Ripple Performance: Ripple current ratings at 120 Hz and 50 kHz (1.86 A and 2.66 A respectively) enable use across both mains‑frequency and high‑frequency converter contexts.
• Predictable Leakage Behavior: Leakage current bound by I ≤ 3√(C·V) µA after initial voltage application ensures predictable DC loss for system power budgeting.
• Practical Snap‑In Packaging: Snap‑in terminals and a radial can simplify board assembly and mechanical retention in power modules.
• Standards‑Aware Manufacturing: RoHS compliance supports regulatory requirements for modern equipment designs.

Why Choose LQSW6471MELB45?

The LQSW6471MELB45 combines high voltage (420 V), substantial capacitance (470 µF), and a 105°C temperature rating to meet the needs of power electronics designs that demand reliable bulk energy storage and frequent charge–discharge cycles. Its specifications—endurance at elevated temperature, defined leakage current behavior, and ripple current ratings at both low and high frequency—make it appropriate for inverter, servo, and other high‑frequency regenerative applications.

This Nichicon LQS series snap‑in capacitor is aimed at engineers specifying robust, high‑voltage electrolytic solutions for industrial power assemblies and converter platforms where long‑term stability and predictable electrical characteristics are required.

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