LQS2V391MELA45

The LQS2V391MELA45 is a snap‑in terminal aluminum electrolytic capacitor in a φ25×45 mm can, rated 390 µF at 350 V. It is designed for high‑speed charge–discharge environments and targeted at power electronics where regenerative voltages and fluctuating line conditions occur.

Typical use cases include AC servomotor drives, general inverters, and rectifier circuits such as voltage doublers. The part combines high voltage handling, defined ripple capability across low and high frequency, and long‑life endurance up to 105°C.

Key Features

• Capacitance and Voltage: 390 µF nominal capacitance with a 350 V rated voltage (polarized), suitable for high‑voltage power circuits.
• Snap‑In Mounting & Package: Radial, can‑type snap‑in terminals for secure PCB mounting and robust mechanical retention.
• Size: Compact φ25×45 mm can (L: 4.5 × D: 2.5 cm), balancing energy density and board footprint.
• Temperature Range & Lifetime: Operating temperature –25°C to +105°C with rated endurance of 3000 hours at 105°C.
• High‑Speed Charge–Discharge Endurance: Designed for high‑speed charge–discharge behavior; series test criteria include performance after 50 million cycles at room temperature.
• Ripple Current Performance: Rated ripple current of 1.3 A at 120 Hz and 1.859 A at 50 kHz for both low‑ and high‑frequency applications.
• Electrical Limits: Capacitance tolerance ±20% (measured at 120 Hz, 20°C). Leakage current specification follows I ≤ 3√(C·V) µA after 5 minutes at 20°C.
• Loss Characteristics: Maximum tan δ of 0.15 at the 350 V rating (measured at 120 Hz, 20°C), supporting predictable dissipation behavior.
• RoHS Compliance: Compliant to the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• AC Servomotor Drives: Handles high‑frequency regenerative voltages encountered in servo systems and drive loops.
• General Inverters: Energy storage and smoothing in inverter DC link circuits subject to voltage fluctuation and pulse stress.
• Voltage Doubler Rectifiers: Suited for rectifier circuits using voltage doubler topologies where high DC voltages and charge–discharge events occur.
• Industrial Power Electronics: General purpose use in equipment operating in environments with fluctuating supply voltages and high ripple demands.

Unique Advantages

• High‑Voltage Capability: 350 V rating enables use in medium‑voltage DC link and rectifier applications without additional series stacking.
• Dual‑Frequency Ripple Handling: Specified ripple current at 120 Hz and 50 kHz supports both mains‑frequency smoothing and high‑frequency switching environments.
• Thermal Endurance: 3000 hours at 105°C provides defined long‑term performance for demanding thermal conditions.
• Robust Charge–Discharge Endurance: Series testing to 50 million charge–discharge cycles at room temperature demonstrates suitability for high‑speed regenerative duties.
• Secure Mechanical Mounting: Snap‑in terminals simplify assembly and improve mechanical stability in heavy‑current power assemblies.
• Regulatory Compliance: RoHS conformity supports use in designs requiring restricted‑substance compliance.

Why Choose LQS2V391MELA45?

The LQS2V391MELA45 positions itself for power electronics designers who need a high‑voltage, snap‑in aluminum electrolytic capacitor with clear ripple, temperature, and endurance specifications. Its combination of 350 V rating, defined ripple current at both low and high frequencies, and 3000‑hour thermal endurance makes it appropriate for inverters, motor drives, and rectifier circuits exposed to fluctuating voltages and regenerative events.

For engineers specifying components for robust DC link, smoothing, or charge–discharge applications, this part delivers measurable, datasheet‑backed characteristics that help with thermal budgeting, lifetime planning, and mechanical integration.

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