RKS1E391MCNAJJGS

The RKS1E391MCNAJJGS is a surface-mount conductive polymer aluminum solid electrolytic capacitor offering 390 µF capacitance at a 25 V rating. It combines high capacitance with low equivalent series resistance (ESR) and elevated ripple-current capability for demanding power applications.

Designed for general-purpose power decoupling and energy-storage on compact SMD assemblies, this component delivers long life (3000 hours at 125°C) and wide operating temperature range (–55°C to 125°C), enabling reliable operation in thermally challenging environments.

Key Features

• Capacitance & Tolerance — 390 µF nominal capacitance with a tolerance of −20% to +20% (measured at 120 Hz, 20°C).
• Voltage Rating — Rated for 25 V operation for use on mid-voltage power rails.
• Low ESR / High-Frequency Performance — Rated ESR of 20 mΩ at 100 kHz (20°C) and specified tanδ of 0.12 at 120 Hz, 20°C, supporting efficient high-frequency decoupling.
• Ripple Current Capability — Low-frequency ripple current 200 mA (120 Hz) and high-frequency ripple current 2.0 A (300 kHz) for effective smoothing under dynamic loads.
• Leakage Current — Specified leakage current of 487 µA after rated voltage application.
• Robust Thermal & Endurance Specification — Operating temperature range −55°C to 125°C with a rated load life of 3000 hours at 125°C.
• Surface-Mount Can Package — φ10 × 10 mm (diameter × length) radial can in an SMD package, supplied in embossed carrier taping with moisture-proof packing for automated assembly.
• Soldering/Assembly Compatibility — SMD type designed to meet lead-free reflow soldering conditions with a 260°C peak correspondence as specified for the series.

Typical Applications

• DC–DC Converter Output Filtering — Low ESR and high high-frequency ripple capability make it suitable for smoothing and stabilization on converter output rails.
• Power Rail Decoupling — High capacitance per package supports transient load handling and voltage stabilization on local power domains in compact boards.
• High-Frequency Power Circuits — 20 mΩ ESR at 100 kHz and 2.0 A high-frequency ripple rating support applications with fast switching and high ripple content.
• Embedded and Industrial Electronics — Wide −55°C to 125°C temperature range and 3000-hour life at 125°C suit long-life, thermally stressed embedded systems and industrial power modules.

Unique Advantages

• High Capacitance in SMD Form — 390 µF in a compact φ10 × 10 mm SMD can reduces board area for bulk energy storage.
• Low ESR Improves Power Efficiency — 20 mΩ ESR at 100 kHz reduces I²R losses and improves voltage stability under high-frequency switching.
• Rated for Elevated Temperatures — 3000 hours life at 125°C provides predictable endurance for designs exposed to sustained high temperatures.
• Wide Ripple-Current Range — Specified ripple performance at both low and high frequencies enables use across a range of power-conditioning roles.
• Assembly-Ready Packaging — Supplied in embossed carrier taping with moisture-proof packing for automated placement and protection during storage.

Why Choose RKS1E391MCNAJJGS?

RKS1E391MCNAJJGS is positioned for designers who need a high-capacitance, low-ESR SMD solution with proven endurance at elevated temperatures. Its combination of 390 µF capacitance, 25 V rating, 20 mΩ ESR (100 kHz), and a 3000-hour life at 125°C makes it well suited to power-supply smoothing, decoupling, and high-frequency energy-storage tasks in compact assemblies.

This part is ideal for engineers and procurement teams seeking a robust, assembly-ready polymer aluminum electrolytic capacitor that balances capacitance density, thermal endurance, and ripple-current capability for general-purpose power electronics.

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