RNU1D391MCNASQ

The RNU1D391MCNASQ is a radial‑lead conductive polymer aluminum solid electrolytic capacitor with a capacitance of 390 µF and a 20 V rated voltage. It delivers low equivalent series resistance (ESR) and high ripple current capability in a compact φ8×11.5 mm can, designed for general‑purpose electronic power applications.

Key value propositions include low ESR at high frequency (14 mΩ at 100 kHz), high ripple current handling up to 4.97 A at 300 kHz, and extended endurance of 5000 hours at 105°C—features that support reliable power filtering and bulk decoupling in compact assemblies.

Key Features

• Capacitance & Tolerance — 390 µF nominal with tolerance of −20% to +20% at 120 Hz, 20°C for predictable energy storage.
• Rated Voltage — 20 V DC nominal rating for mid‑voltage power rails.
• Low ESR for High‑Frequency Use — ESR of 14 mΩ measured at 20°C/100 kHz, enabling lower loss and improved regulation in high‑frequency circuits.
• High Ripple Current Capability — Low‑frequency ripple current of 497 mA at 120 Hz and high‑frequency ripple current of 4.97 A at 300 kHz for robust handling of AC content on power rails.
• Extended Endurance — Rated life of 5000 hours at 105°C, supporting long‑running designs in elevated ambient temperatures.
• Temperature Range — Operates from −55°C to +105°C to suit a wide range of environments.
• Compact Radial Package — φ8×11.5 mm can with 3.5 mm lead spacing (±0.5 mm) for through‑hole mounting and straightforward PCB placement; available in bulk or bag packing.
• RoHS Compliant — Meets RoHS directive requirements for materials compliance.

Typical Applications

• Power supply decoupling — Low ESR and high ripple current support filtering and stabilization of DC power rails in power supplies and regulators.
• DC–DC converter output filtering — High ripple current capability at high frequencies helps manage switching ripple on converter outputs.
• General purpose electronic equipment — Suitable for boards and modules requiring compact bulk capacitance with reliable endurance across −55°C to 105°C.

Unique Advantages

• Low loss at high frequency: 14 mΩ ESR at 100 kHz reduces dissipation in high‑frequency circuits, improving efficiency and thermal performance.
• High ripple handling capability: Rated for up to 4.97 A ripple at 300 kHz, enabling use in demanding switching environments.
• Long operational life: 5000 hours at 105°C provides durable performance for prolonged deployments in warm operating conditions.
• Broad temperature tolerance: −55°C to +105°C rating allows operation across a wide range of environmental conditions.
• Compact through‑hole form factor: φ8×11.5 mm radial can with 3.5 mm lead spacing offers a space‑efficient solution for PCB layouts that prefer through‑hole components.
• Materials compliance: RoHS compliance supports environmental and regulatory requirements in product development.

Why Choose RNU1D391MCNASQ?

The RNU1D391MCNASQ combines conductive polymer aluminum capacitor technology with a compact radial can to deliver a balance of high capacitance, low ESR, and strong ripple current capability. Its 20 V rating, 390 µF capacity, and 14 mΩ ESR at 100 kHz make it a practical choice for designers seeking reliable power filtering and decoupling in space‑constrained, through‑hole applications.

This part is aimed at engineers and procurement teams designing general‑purpose electronic equipment that requires durable capacitors with verified endurance (5000 h at 105°C), broad operating temperature range, and RoHS compliance—providing long‑term value through predictable electrical performance and regulatory alignment.

Request a quote or submit an inquiry for RNU1D391MCNASQ to discuss pricing, availability, and packaging options for your production or prototyping needs.