RKS1D391MCNAHHGS

The RKS1D391MCNAHHGS is a surface-mount conductive polymer aluminum solid electrolytic capacitor in Nichicon’s RKS series, offering 390 µF capacitance at a 20 V rating. It combines high capacitance in a compact radial SMD can (φ8 × 8.7 mm) with low equivalent series resistance and high allowable ripple current for high-frequency power applications.

Designed for reliable operation across a wide temperature range (−55°C to 125°C) and long-term endurance (3,000 hours at 125°C), this part targets demanding power-rail smoothing and decoupling applications where low ESR, high ripple handling and reflow compatibility are required.

Key Features

• Capacitance and Voltage — 390 µF nominal capacitance with a rated voltage of 20 V and capacitance tolerance of −20% to +20% (measured at 20°C, 120 Hz).
• Low ESR and High-Frequency Performance — ESR of 30 mΩ measured at 20°C/100 kHz, and a high-frequency ripple current rating of 1.6 A (at 300 kHz), supporting tight decoupling at switching frequencies.
• Ripple Current Capability — Low-frequency ripple current of 160 mA (120 Hz) and high-frequency ripple current of 1.6 A (300 kHz), enabling effective smoothing in both line- and switching-frequency domains.
• High Temperature Endurance — Rated life of 3,000 hours at 125°C under rated voltage, providing extended service in elevated-temperature environments.
• Electrical Losses — Tangent of loss angle (tan δ) of 0.12 (measurement at 20°C, 120 Hz), indicating controlled dissipation for reliable operation.
• Compact SMD Package — Radial can SMD package (φ8 × 8.7 mm) optimized for automated assembly; supplied in embossed carrier tape with moisture-proof packing.
• Leakage Current — Specified leakage current of 390 µA after standard conditioning.
• RoHS Compliant — Conforms to applicable RoHS requirements for lead-free assembly processes.
• Reflow Compatible — Designed for lead-free reflow soldering up to 260°C peak per the series soldering guidelines.

Typical Applications

• Switching power supplies / DC–DC converters — Output smoothing and decoupling where low ESR and high ripple current handling improve regulation and transient response.
• Telecom and networking equipment — Power-rail bulk and decoupling components for systems that require wide operating temperature range and long endurance.
• Industrial power modules — Bulk storage and filtering in power assemblies exposed to elevated temperatures and continuous operation.
• Space-constrained electronics — High capacitance in a small SMD radial can for compact board designs that need reliable bulk capacitance and low-loss performance.

Unique Advantages

• High ripple tolerance — 1.6 A at 300 kHz and 160 mA at 120 Hz support demanding switching environments and reduce thermal stress on the capacitor.
• Low ESR — 30 mΩ at 100 kHz lowers I²R losses and improves efficiency in high-frequency decoupling applications.
• Long high-temperature life — 3,000 hours at 125°C delivers extended service life for prolonged high-temperature operation.
• Compact SMD can with automated packaging — φ8 × 8.7 mm radial SMD form factor and embossed carrier tape with moisture-proof packing streamline pick-and-place and reflow assembly.
• Controlled electrical loss — Specified tan δ and leakage current values allow predictable dissipation and design margining for thermal and power budgets.
• RoHS-compliant, lead-free reflow — Supports modern lead-free assembly processes and environmental requirements.

Why Choose RKS1D391MCNAHHGS?

The RKS1D391MCNAHHGS positions itself as a compact, high-capacitance conductive-polymer aluminum SMD solution that balances low ESR, strong ripple-current capability and long endurance at elevated temperatures. These attributes make it well-suited for engineers designing high-frequency switching power supplies, telecom and industrial power systems, and other applications where reliable bulk capacitance and low-loss performance are required in a small footprint.

With reflow compatibility, embossed carrier tape packaging and RoHS compliance, this part supports automated assembly and modern production requirements while providing predictable electrical behavior across a wide temperature range.

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