RNU1D391MDN1

The RNU1D391MDN1 is a conductive polymer aluminum solid electrolytic capacitor in a radial lead can package, rated 20 V with 390 µF nominal capacitance and ±20% tolerance. It combines low ESR and high ripple capability with a wide operating temperature range to address general-purpose electronic power functions.

Designed for general purpose applications, the device offers measurable advantages in high-frequency ripple handling and long-term endurance with a 2000-hour life at 105°C, making it suitable where compact bulk capacitance and reliable power smoothing are required.

Key Features

• Capacitance & Tolerance — 390 µF nominal with ±20% tolerance (measured at 120 Hz, 20°C).
• Rated Voltage — 20 V DC rated voltage for mid-voltage power rails.
• Low Loss / Frequency Performance — tan δ = 0.12 at 20°C, 120 Hz, supporting stable behaviour in AC conditions.
• Very Low ESR — 14 mΩ ESR measured at 20°C and 100 kHz, supporting lower conduction losses at high frequencies.
• High Ripple Current Capability — 497 mA at 120 Hz (low frequency) and 4.97 A at 300 kHz (high frequency), with frequency coefficients defined in the datasheet (0.10 @120 Hz, 0.45 @1 kHz, 0.50 @10 kHz, 1.00 @100 kHz and 300 kHz).
• Leakage Current — 1560 µA measured after 2 minutes at 20°C under rated voltage.
• Endurance — 2000 hours at 105°C under rated voltage per product specification.
• Package & Mounting — Radial lead can, φ8 × 11.5 mm body with 3.5 mm lead spacing (±0.5 mm); supplied in bulk bag packing for high-volume assembly.
• Environmental Compliance — RoHS compliant.

Typical Applications

• General Purpose Power Supply Smoothing — Low ESR and high ripple current support bulk decoupling and smoothing on mid-voltage rails.
• High-Frequency Power Conditioning — High-frequency ripple capability (4.97 A at 300 kHz) and 14 mΩ ESR help reduce voltage ripple in switching regulator outputs and DC–DC converters.
• Energy Storage for Short Bursts — 390 µF capacitance provides compact local energy storage for transient loads in general purpose electronics.

Unique Advantages

• Measurable Low ESR: 14 mΩ at 100 kHz reduces conduction losses and supports tighter voltage regulation at high switching frequencies.
• High Ripple Handling Across Frequency: Rated ripple current values and published frequency coefficients let designers quantify performance from 120 Hz up to 300 kHz.
• Compact Radial Can: φ8 × 11.5 mm footprint with radial leads and 3.5 mm spacing eases through-hole placement for compact board layouts and retrofit designs.
• Designed for Elevated Temperatures: 2000-hour endurance at 105°C provides a defined lifetime metric for thermal-stressed environments.
• Simple Procurement & Assembly: Bulk bag packing supports high-volume production workflows.
• Regulatory Compliance: RoHS compliant for use in regions requiring restricted-substance conformance.

Why Choose RNU1D391MDN1?

The RNU1D391MDN1 positions itself as a reliable, high-capacitance conductive polymer solution for general purpose power functions where low ESR and defined high-frequency ripple performance matter. Its combination of 390 µF capacitance, 20 V rating, and a documented 2000-hour life at 105°C provides clear, verifiable metrics for designers targeting robust power smoothing and decoupling.

This part is suited to engineering teams and procurement sourcing components for compact through-hole designs that require measured high-frequency behavior, predictable lifetime at elevated temperature, and straightforward integration into production (radial lead, bulk bag). The documented specifications support engineering trade-offs between capacitance, ripple capability, and thermal endurance.

Request a quote or submit a quotation request to get pricing and availability information for the RNU1D391MDN1. Our team can provide lead-time details and packing options for volume production.