RKS1E391MCNAJLGS

The RKS1E391MCNAJLGS is a surface-mount conductive polymer aluminum solid electrolytic capacitor from Nichicon's RKS series, rated at 390 μF and 25 V. It delivers high capacitance in an SMD radial-can form factor for general-purpose electronics that require low ESR, elevated ripple handling, and extended high-temperature endurance.

Designed for board-level power applications, this capacitor combines a wide operating temperature range and a long rated life to support reliable power smoothing, decoupling, and energy storage in compact assemblies.

Key Features

• Type / Core – Conductive polymer aluminum solid electrolytic, SMD radial-can construction suitable for surface-mount assembly.
• Capacitance & Tolerance – 390 μF with a tolerance of −20% to +20% measured at 20°C, 120 Hz.
• Rated Voltage – 25 V nominal rating for mid-voltage power rails.
• Tangent of Loss (tan δ) – 0.12 specified at 20°C, 120 Hz, supporting predictable AC loss behavior.
• Low ESR – ESR of 20 mΩ measured at 20°C and 100 kHz, enabling improved transient response and reduced heat generation.
• High Ripple Current – Low-frequency ripple current: 200 mA at 120 Hz; high-frequency ripple current: 2.0 A at 300 kHz, supporting mixed-frequency power environments.
• Leakage Current – Specified leakage current of 487 μA under rated conditions.
• Lifetime / Endurance – Rated life of 3000 hours at 125°C to support extended high-temperature operation.
• Operating Temperature Range – −55°C to +125°C for broad environmental coverage.
• Packaging & Mounting – Embossed carrier taping with moisture-proof packing; SMD-compatible lead-free reflow soldering (peak 260°C compatibility noted for the series).
• RoHS Compliance – Compliant to RoHS requirements.
• Size – φ10 × 12.4 L (L: 1.24 cm × D: 1.00 cm) for compact board placement.

Typical Applications

• General-Purpose Power Filtering – Bulk smoothing and filtering on 25 V rails where high capacitance and low ESR reduce voltage ripple.
• Board-Level Decoupling – Local energy reservoir for transient loads, leveraging low ESR and high ripple current capability.
• Compact Power Modules – SMD radial-can size and taped packaging simplify placement in space-constrained power assemblies.
• High-Temperature Electronics – Suitable for equipment operating up to 125°C, backed by a 3000-hour life rating at that temperature.

Unique Advantages

• High Capacitance in a Compact SMD Package: 390 μF in a φ10 × 12.4 L form factor reduces board area for equivalent capacitance compared with larger through-hole parts.
• Low ESR for Better Transient Performance: 20 mΩ at 100 kHz lowers I²R losses and improves regulator stability and transient response.
• Robust Ripple Handling: Rated ripple currents of 200 mA (120 Hz) and 2.0 A (300 kHz) accommodate mixed-frequency noise and switching environments.
• Extended High-Temperature Endurance: 3000 hours at 125°C supports long-term reliability in thermal-stressed designs.
• SMD Assembly Ready: Embossed carrier taping with moisture-proof packing and compatibility with lead-free reflow profiles eases automated placement and soldering.
• Predictable Loss Characteristics: Specified tan δ (0.12) at 20°C, 120 Hz helps designers model AC losses and heating under load.

Why Choose RKS1E391MCNAJLGS?

RKS1E391MCNAJLGS positions itself as a reliable, high-capacitance SMD solution for designers who need low ESR, strong ripple performance, and extended high-temperature life. Its conductive polymer aluminum construction and series-level reflow compatibility make it practical for automated assembly and thermal-stressed applications.

This part is well suited to engineers specifying compact, board-mounted power components for general-purpose electronics, power modules, and high-temperature systems where long-term stability and measurable loss and leakage characteristics are important for design verification and reliability planning.

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