LAR2W391MELC40

The LAR2W391MELC40 is a snap‑in terminal aluminum electrolytic capacitor specified at 390 µF and 450 V. It is a polarized, radial can device designed for general-purpose applications that require high-voltage smoothing, energy storage and ripple handling in elevated temperature environments.

Key value propositions include endurance under high temperature and ripple stress, a safety‑focused overvoltage behavior, and RoHS compliance—making it suitable for robust designs that operate up to 105 °C.

Key Features

• Capacitance and Voltage: 390 µF rated capacitance at 450 V for high-voltage energy storage applications.
• High‑temperature endurance: Rated operating temperature up to 105 °C with specified lifetime of 2000 hours at 105 °C under D.C. bias plus rated ripple current.
• Permissible overvoltage safety: Designed for reduced short incidence when exposed to overvoltage (rated voltage × 1.5); safety testing shows more than 60% passing under the defined test condition.
• Ripple current capability: Specified ripple current of 1.61 A at 120 Hz and 2.302 A at 50 kHz; frequency coefficients in the datasheet allow frequency‑dependent ripple sizing.
• Electrical loss and leakage: tan δ max of 0.20 at 120 Hz (450 V rating, measured at 20 °C); leakage current specified as I ≤ 3√CV (µA) after 5 minutes at 20 °C.
• Low‑temperature impedance behavior: For 400/450 V types, impedance ratio Z(‑25 °C)/Z(+20 °C) is specified up to 8, supporting performance in cooler conditions within the rated range.
• Robust mechanical package: Radial, can snap‑in mounting for secure board attachment and simplified assembly.
• Regulatory compliance: Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).
• Form factor: Physical dimensions: approximately L: 4 cm × D: 3.5 cm (radial can, snap‑in terminal).

Typical Applications

• High‑voltage power supplies: Energy storage and smoothing where a 450 V rated, high‑temperature capacitor is required.
• Industrial power electronics: Bulk capacitance and ripple handling in general‑purpose converters and control systems operating up to 105 °C.
• Electrolytic filtering: AC/DC filter and decoupling duties requiring specified ripple current capability at both low and high frequencies.

Unique Advantages

• High‑temperature ripple endurance: Withstands 2000 hours of rated ripple current at 105 °C, helping maintain performance in sustained elevated‑temperature operation.
• Overvoltage resilience: Designed to reduce short incidence under 1.5× rated voltage conditions, improving safety margins in transient events.
• Frequency-aware ripple ratings: Documented ripple current values and frequency coefficients allow accurate thermal and lifetime planning across common frequencies.
• Clear electrical limits: Specified tan δ and leakage current formula provide measurable criteria for design verification and component acceptance testing.
• Secure mounting: Snap‑in radial can package delivers reliable mechanical retention for board‑level applications.
• RoHS compliance: Meets regulatory requirements for restricted substances, supporting compliant product builds.

Why Choose LAR2W391MELC40?

LAR2W391MELC40 positions itself as a reliable high‑voltage electrolytic solution for general‑purpose designs that demand sustained ripple handling and operation up to 105 °C. Its combination of 390 µF capacitance at 450 V, documented ripple current ratings, and a 2000‑hour endurance at elevated temperature provides an explicit specification set for engineers to design and verify against.

This part is well suited to customers building high‑voltage power systems, industrial power electronics, and applications requiring defined overvoltage behavior and RoHS compliance. The clear electrical and mechanical specifications simplify selection, thermal planning, and long‑term reliability assessments.

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