RKS1E390MCNAFEGS

The RKS1E390MCNAFEGS is a surface-mount conductive polymer aluminum solid electrolytic capacitor in Nichicon’s RKS series. It provides 39 µF capacitance at a 25 V rating in a compact φ6.3 × 5.8 mm SMD can, designed for applications where low ESR, high ripple handling and elevated temperature endurance are required.

Its combination of low equivalent series resistance, high allowable ripple current and proven 3000-hour life at 125°C makes it suitable for compact power delivery and filtering roles in industrial and commercial electronic designs.

Key Features

• Capacitance & Voltage — 39 µF nominal capacitance with a rated voltage of 25 V and a tolerance of −20% to +20%.
• Conductive Polymer Construction — Solid electrolyte polymer design for stable performance and low impedance compared with traditional electrolytics.
• Low ESR — ESR of 50 mΩ measured at 20°C, 100 kHz, enabling effective high-frequency decoupling and reduced loss.
• High Ripple Capability — Low-frequency ripple current 90 mA (120 Hz) and high-frequency ripple current 900 mA (300 kHz) for robust power filtering under dynamic loads.
• Thermal & Endurance Rating — Operates from −55°C to +125°C with a rated life of 3000 hours at 125°C, supporting demanding temperature environments.
• Leakage & Loss — Leakage current specified at 100 µA and tangent of loss angle (tanδ) of 0.12 measured at 20°C, 120 Hz.
• SMD Package & Assembly — Radial can SMD package (φ6.3 × 5.8 mm) supplied in embossed carrier taping with moisture-proof packing; compatible with lead-free reflow up to 260°C peak per the series soldering profile.
• Compliance — RoHS compliant.

Typical Applications

• Power Modules and DC–DC Converters — Low ESR and high ripple current capability make this part ideal for bulk or output filtering in compact switching power supplies.
• Point-of-Load Decoupling — Small SMD can and strong high-frequency performance support decoupling close to regulators and ICs to stabilize voltage rails.
• Industrial Electronics — Extended temperature range (−55°C to 125°C) and 3000-hour life at 125°C suit long-life electronic equipment operating in elevated temperature environments.

Unique Advantages

• Compact SMD Form Factor: φ6.3 × 5.8 mm radial can provides a high-capacitance solution in a small board footprint for space-constrained designs.
• High-Frequency Performance: 50 mΩ ESR at 100 kHz and a 900 mA ripple rating at 300 kHz reduce losses and improve transient response in switching applications.
• Robust Thermal Endurance: Rated life of 3000 hours at 125°C delivers predictable long-term behavior in high-temperature assemblies.
• Manufacturing-Ready Packaging: Embossed carrier taping with moisture-proof packing and compatibility with 260°C peak reflow simplifies automated assembly and handling.
• Stable Leakage and Loss Characteristics: Specified leakage current (100 µA) and tanδ (0.12 at 20°C/120 Hz) provide measurable performance for design verification.

Why Choose RKS1E390MCNAFEGS?

RKS1E390MCNAFEGS combines conductive-polymer solid electrolyte construction with low ESR and high ripple capability in a compact SMD can. The part is positioned for engineers who need reliable, high-frequency filtering and stable operation across a wide temperature range without sacrificing board space.

Its 3000-hour endurance at 125°C, RoHS compliance and assembly-friendly packaging deliver long-term value for industrial and commercial power delivery designs where predictable performance and manufacturability are priorities.

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