RNU1D391MCN1

The RNU1D391MCN1 is a radial-lead conductive polymer aluminum solid electrolytic capacitor in Nichicon’s RNU series. It provides 390 µF nominal capacitance at a 20 V rating in a compact φ8×11.5 mm can with polarized radial leads.

Designed for general-purpose electronic designs, this part combines low ESR and high ripple-current capability with a wide operating temperature range (−55 °C to 105 °C) and a rated load life of 2000 hours at 105 °C for reliable power handling in confined assemblies.

Key Features

• Capacitance & Tolerance — 390 µF nominal capacitance with tolerance −20% to +20% (measured at 120 Hz, 20 °C).
• Rated Voltage — 20 V DC rating suitable for low-voltage power applications.
• Low ESR — ESR of 14 mΩ measured at 20 °C / 100 kHz, supporting reduced losses at high frequency.
• High Ripple Current — Low-frequency ripple current 497 mA (120 Hz) and high-frequency ripple current 4.97 A (300 kHz), enabling improved AC current handling.
• Leakage Current — Specified leakage current of 1560 µA (measurement conditions per datasheet).
• Reliability & Life — Endurance rating of 2000 hours at 105 °C under rated voltage.
• Temperature Range — Operates from −55 °C to 105 °C for broad environmental tolerance.
• Package & Mounting — Radial lead, polarized can package; size φ8 × 11.5 mm, lead spacing 3.5 mm (±0.5 mm).
• Soldering Compatibility — Radial lead type compatible with lead-free flow soldering conditions (series specification).
• RoHS Compliance — Compliant with RoHS requirements.
• Availability — Mass production status; packaged in bulk or bag packing (no terminal forming).

Typical Applications

• General-purpose electronic circuits — Where a 390 µF, 20 V polarized radial-lead capacitor is required and designers need low ESR and controlled ripple capability.
• Compact assemblies — Small φ8×11.5 mm can and 3.5 mm lead spacing make the part suitable for space-constrained board layouts that require solid polymer electrolytic performance.
• Thermally demanding environments — Circuits that must tolerate wide ambient temperatures (−55 °C to 105 °C) and have a defined endurance requirement of 2000 hours at 105 °C.

Unique Advantages

• Low ESR for reduced losses — 14 mΩ at 100 kHz (20 °C) lowers AC losses compared with higher-ESR options, improving efficiency where high-frequency currents are present.
• High ripple-current capability — Rated ripple performance up to 4.97 A at 300 kHz provides headroom for high-frequency AC stress within the 20 V rating.
• Compact radial form factor — φ8×11.5 mm can with 3.5 mm lead spacing fits tight board real estate while preserving high capacitance.
• Wide temperature range and defined life — −55 °C to 105 °C operating range and 2000 h endurance at 105 °C give predictable behavior in elevated-temperature applications.
• Manufacturing-friendly — Radial lead construction and compatibility with lead-free flow soldering conditions ease through-process assembly and wave/flow solder use as specified by the series.
• Regulatory compliance — RoHS-compliant construction supports regulatory requirements for lead-free designs.

Why Choose RNU1D391MCN1?

RNU1D391MCN1 places a high-capacitance conductive polymer aluminum solution into a compact radial-lead package, delivering low ESR, strong ripple-current handling, and a wide −55 °C to 105 °C operating window. Its defined 2000-hour life at 105 °C and measured electrical characteristics make it a predictable component for designs that need stable capacitance and controlled dissipation under elevated temperatures.

This part is well suited to engineers and procurement teams specifying polarized polymer electrolytic capacitors for general-purpose electronics where measurable ESR, ripple capability, compact dimensions, and RoHS compliance are required.

To request a quote or submit a purchase inquiry for RNU1D391MCN1, please contact sales with your quantity and delivery requirements.