RKS1D391MCNAJJGS

The RKS1D391MCNAJJGS from Nichicon is a surface-mount conductive polymer aluminum solid electrolytic capacitor delivering 390 µF at 20 V. Engineered for general-purpose power management, it combines high capacitance, low ESR and high allowable ripple current in a compact φ10 × 10 mm SMD can.

Designed for applications that require robust thermal endurance and stable performance, the RKS series offers long life (3,000 hours at 125°C) and compatibility with lead‑free reflow processes, packaged in embossed carrier taping with moisture‑proof packing for reliable production handling.

Key Features

• Capacitance & Voltage — 390 µF nominal capacitance with a rated voltage of 20 V and tolerance of -20% to +20%, suitable for bulk charge storage and decoupling on 20 V rails.
• Conductive Polymer Electrolyte — Solid conductive polymer construction for stable performance and low DC leakage compared to wet electrolytes; leakage current specified at 390 µA.
• Low ESR & High Ripple Capability — ESR of 20 mΩ measured at 20°C/100 kHz and high frequency ripple current rated at 2.0 A (300 kHz), plus 200 mA at 120 Hz, enabling effective high-frequency smoothing and reduced losses.
• Thermal Endurance — Operating temperature range from -55°C to +125°C with load life of 3,000 hours at 125°C, providing long-term stability under elevated temperature stress.
• Loss Tangent — tan δ = 0.12 measured at 20°C, 120 Hz, for predictable AC loss characteristics in filter and decoupling applications.
• SMD Can Package & Assembly — φ10 × 10 mm radial can SMD package, compatible with lead‑free reflow soldering (260°C peak correspondence) and shipped in embossed carrier tape with moisture‑proof packing for automated assembly.

Typical Applications

• Power supply filtering — Bulk and output smoothing on 20 V rails where high capacitance and low ESR improve transient response and reduce voltage ripple.
• Decoupling for high-frequency converters — High allowable ripple current and low ESR support switching regulator output filtering and localized energy storage.
• High-temperature electronics — Use in designs that require stable capacitance and endurance at elevated temperatures up to 125°C.

Unique Advantages

• High capacitance in a compact SMD package: 390 µF in a φ10 × 10 mm can minimizes board area while providing substantial bulk energy storage.
• Low ESR for efficiency: 20 mΩ (100 kHz) reduces conduction losses and heat generation in high-current, high-frequency circuits.
• Strong ripple handling: 2.0 A at high frequency (300 kHz) and 200 mA at 120 Hz support demanding switching and decoupling scenarios.
• Long thermal life: 3,000 hours at 125°C provides reliability in thermally stressed designs and extends maintenance intervals.
• SMD-ready, production-friendly packaging: Lead‑free reflow compatibility and embossed carrier tape with moisture‑proof packing streamline automated assembly and supply-chain handling.
• Predictable loss characteristics: Specified tan δ and leakage enable accurate thermal and performance modeling in design validation.

Why Choose RKS1D391MCNAJJGS?

RKS1D391MCNAJJGS combines conductive polymer aluminum technology with a compact SMD can to deliver high capacitance, low ESR and high ripple capability for general-purpose power management on 20 V rails. Its extended temperature range (−55°C to +125°C) and 3,000 hour life at 125°C make it a strong choice where thermal endurance and long-term stability matter.

This part is well suited to engineers designing power supplies, DC‑DC converters and other systems that require stable bulk storage and efficient high-frequency decoupling in a production-ready SMD form factor. Backed by Nichicon’s RKS series specifications and packaged for automated assembly, it supports reliable integration into volume designs.

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