UPJ1K391MHD

The UPJ1K391MHD is a miniature, radial‑lead aluminum electrolytic capacitor in Nichicon's UPJ series, designed for low‑impedance, high‑reliability power applications. It combines a 390 µF capacitance with an 80 V rated voltage in a compact φ12.5 × 40 mm can with 5 mm lead spacing.

Targeted for general‑purpose power designs and switching power supplies, this capacitor delivers measurable endurance and ripple handling for demanding thermal and electrical environments, backed by RoHS compliance and mass‑production availability.

Key Features

• Capacitance & Rated Voltage — 390 µF capacitance rated at 80 V, with capacitance tolerance of −20% to +20% for predictable performance in power filter circuits.
• Low Loss (tan δ) — tanδ 0.08 measured at 20°C, 120 Hz, supporting lower internal heating and stable AC behavior at rated conditions.
• High Ripple‑Current Capability — Low‑frequency ripple current 493.2 mA (120 Hz) and high‑frequency ripple current 822 mA (200 kHz) to support filtering and decoupling in switching supplies.
• Leakage Current — Specified leakage current of 936 µA, allowing designers to budget quiescent currents precisely.
• Extended Endurance — Rated for 5000 hours at 105°C, indicating sustained performance under elevated temperature stress.
• Wide Operating Temperature — Operates from −55°C to +105°C to accommodate a broad range of environmental conditions.
• Radial‑Lead Package — φ12.5 × 40 mm can with 5 mm lead spacing (±0.5 mm tolerance), radial lead mounting for through‑hole PCB installation.
• Packaging & Availability — Supplied in bulk (no terminal forming) or bag packing; product is in mass production and RoHS compliant.

Typical Applications

• Switching Power Supplies — Low impedance and high ripple capability make this capacitor well suited for input/output filtering and energy storage in SMPS designs.
• Power Rail Filtering — Use on DC rails to smooth voltage and reduce ripple in general‑purpose electronic equipment.
• Embedded Power Modules — Compact radial can and robust temperature/endurance specs support power conditioning in embedded power modules and industrial electronics.

Unique Advantages

• Designed for Low Impedance — Series design emphasis on low impedance supports efficient ripple suppression in switching applications.
• High Thermal Endurance — 5000 hours rated life at 105°C provides predictable long‑term performance under elevated operating temperatures.
• Measured Ripple Specifications — Documented low‑ and high‑frequency ripple current ratings (493.2 mA at 120 Hz; 822 mA at 200 kHz) let engineers size thermal and ripple margins accurately.
• Compact Radial Form Factor — φ12.5 × 40 mm can with 5 mm lead spacing offers a small footprint for through‑hole designs while retaining substantial capacitance.
• Predictable Loss Characteristics — Specified tanδ (0.08 at 20°C, 120 Hz) aids in thermal and impedance modeling for reliable system design.
• Regulatory Compliance — RoHS compliant construction supports use in regulated markets.

Why Choose UPJ1K391MHD?

The UPJ1K391MHD combines Nichicon's UPJ series emphasis on low impedance with a compact radial can, making it a practical choice for engineers who need dependable energy storage and ripple suppression in switching power supplies and general‑purpose power rails. Its specified ripple current ratings, low loss tangent, and extended 5000‑hour life at 105°C enable confident thermal and lifetime planning.

This part is suited to designers and procurement teams looking for a mass‑production, RoHS‑compliant capacitor with clear electrical and mechanical specifications—ideal for integration into power subsystems where endurance, ripple handling, and predictable leakage are required.

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