RKS1E121MCNAFGGS

The RKS1E121MCNAFGGS is a surface-mount conductive polymer aluminum solid electrolytic capacitor in Nichicon’s RKS series. It delivers 120 µF at 25 V in a compact radial can SMD package and is designed for applications that require low ESR, high ripple-current capability and long-term operation at elevated temperatures.

Key use cases include power-supply decoupling and energy storage in electronics where a combination of compact size, high-frequency ripple handling and extended high-temperature endurance are required.

Key Features

• Dielectric / Construction Conductive polymer aluminum solid electrolyte offers stable performance in an SMD radial can form factor.
• Capacitance and Voltage 120 µF rated capacitance at a 25 V rated voltage with ±20% tolerance (120 Hz, 20°C).
• Low Loss & Frequency Performance Tangent of loss angle (tanδ) 0.12 measured at 20°C, 120 Hz; ESR 30 mΩ specified at 20°C/100 kHz.
• High Ripple Current Capability Low-frequency ripple current 140 mA (120 Hz) and high-frequency ripple current 1.4 A (300 kHz), supporting switching regulator decoupling and high-frequency loads.
• Leakage Current Specified leakage current up to 150 µA (after initial conditions defined by the datasheet).
• Extended High-Temperature Endurance Load life of 3000 hours at 125°C under rated voltage conditions.
• Compact SMD Package Case size Ø6.3 × 7.7 mm (L × D) with recommended land size 6.6 × 6.6 mm; surface-mount, radial can (SMD) package.
• Assembly and Compliance Compatible with lead-free reflow soldering (260°C peak correspondence as specified) and packaged in embossed carrier tape with moisture-proof packing; RoHS compliant.

Typical Applications

• Power-supply decoupling and bulk filtering — Low ESR and high ripple-current capability make this part suitable for smoothing and decoupling in switching power supplies and DC–DC converters.
• Point-of-load energy storage — Compact 120 µF capacitance in an SMD radial can supports local energy buffering on dense power distribution boards.
• Telecom and communications equipment — High-frequency ripple handling and long life at elevated temperatures suit power management in networking and telecom modules.
• Industrial controls and instrumentation — Extended 3000-hour endurance at 125°C and wide operating temperature (−55°C to 125°C) address demanding thermal environments.

Unique Advantages

• Low ESR for efficient decoupling: 30 mΩ at 100 kHz reduces voltage ripple and improves regulator stability.
• High-frequency ripple handling: 1.4 A at 300 kHz supports modern high-speed switching converters and fast transient loads.
• Long high-temperature life: 3000 hours at 125°C increases reliability for designs exposed to sustained elevated temperatures.
• Compact SMD radial-can footprint: Ø6.3 × 7.7 mm size provides high capacitance in a small board area for space-constrained designs.
• Reflow-compatible packaging: Designed for lead-free reflow (260°C peak correspondence) and supplied in embossed carrier tape with moisture-proof packing for automated assembly.
• RoHS compliant: Meets environmental directive requirements for lead-free manufacturing processes.

Why Choose RKS1E121MCNAFGGS?

RKS1E121MCNAFGGS combines the electrical advantages of conductive polymer aluminum construction—low ESR and strong high-frequency ripple performance—with a compact SMD radial-can package and extended endurance at elevated temperatures. It is targeted at designers who need reliable decoupling or local energy storage in constrained board space while maintaining performance in hot operating environments.

This part is well suited for engineers building power delivery stages, telecom power modules, industrial controllers and other systems where long life, consistent ESR behavior at high frequency, and robust solder/assembly compatibility are important considerations.

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