RKS1J390MCNAJJGS

The RKS1J390MCNAJJGS is a surface‑mount, conductive‑polymer aluminum electrolytic capacitor from Nichicon’s RKS series. It delivers 39 µF of capacitance at a 63 V rating in a compact φ10 × 10 mm SMD can package with polarized terminals.

Designed for general‑purpose electronic power decoupling and high‑frequency ripple handling, this device combines low ESR and defined high‑frequency ripple capability with a wide operating temperature range and a 3000‑hour endurance at 125°C for demanding thermal environments.

Key Features

• Capacitance & Voltage — 39 µF nominal capacitance with a 63 V rated voltage and a tolerance of −20% to +20% (measured at 120 Hz, 20°C).
• Conductive‑Polymer Electrolyte — Solid conductive‑polymer aluminum construction for stable electrical characteristics and low LC behavior.
• Low ESR — ESR of approximately 30 mΩ measured at 100 kHz and 20°C, supporting efficient high‑frequency performance.
• High Ripple Capability — Low‑frequency ripple current of 140 mA at 120 Hz and high‑frequency ripple current of 1.4 A at 300 kHz for effective smoothing in power circuits.
• Leakage & Dissipation — Leakage current specified at 122 µA and dissipation factor (tan δ) of 0.12 (20°C, 120 Hz) for predictable loss characteristics.
• Wide Temperature & Long Life — Rated for −55°C to +125°C with a rated endurance of 3000 hours at 125°C.
• SMD Can Package — φ10 × 10 mm radial can SMD package (surface‑mount) with embossed carrier taping and moisture‑proof packing suitable for automated assembly.
• Reflow Compatibility & Compliance — SMD design compatible with lead‑free reflow soldering peak up to 260°C (per series datasheet) and marked as RoHS compliant in the series documentation.

Typical Applications

• Power Supply Filtering — Bulk decoupling and smoothing in DC‑DC converters and intermediate bus capacitors where a 63 V rating and low ESR are required.
• High‑Frequency Power Modules — Local energy storage and ripple suppression in high‑frequency switching regulators, leveraging the 1.4 A high‑frequency ripple capability and low ESR.
• Industrial and Embedded Electronics — Robust operation across −55°C to +125°C and 3000 h life at 125°C makes it suitable for compact industrial and embedded power stages.

Unique Advantages

• Compact, high‑voltage solution: 39 µF at 63 V in a φ10 × 10 mm SMD can saves board area while supporting higher bus voltages.
• Reliable high‑temperature endurance: Rated 3000 hours at 125°C, enabling stable performance in elevated‑temperature assemblies.
• Low loss at high frequency: 30 mΩ ESR at 100 kHz and tan δ of 0.12 (120 Hz) reduce heating and improve efficiency in switching applications.
• Assembly‑friendly packaging: Embossed carrier taping with moisture‑proof packing supports automated placement and reflow processing up to 260°C (series recommendation).
• Consistent leakage and DC characteristics: Defined leakage current (122 µA) and dissipation factor provide predictable behavior for design margin calculations.
• Regulatory alignment: Series documentation indicates RoHS compliance, supporting regulatory needs for many electronics applications.

Why Choose RKS1J390MCNAJJGS?

RKS1J390MCNAJJGS positions itself as a practical choice for designers who need a compact, higher‑voltage SMD electrolytic capacitor with low ESR and strong high‑frequency ripple capability. Its 39 µF capacitance at 63 V, combined with a −55°C to +125°C operating window and a 3000‑hour endurance at 125°C, makes it suited to demanding power‑management and industrial embedded applications.

Manufactured by Nichicon as part of the RKS series, this part offers predictable electrical parameters—ESR, leakage current, and dissipation factor—that help reduce design uncertainty and support reliable long‑term operation in deployed equipment.

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