UHW1K391MHD

The UHW1K391MHD is a radial lead, polarized aluminum electrolytic capacitor in Nichicon’s UHW series, designed for miniature sizing with high ripple-current capability and robust long-term endurance. It provides 390 µF capacitance at an 80 V rating in a compact φ12.5×25 mm can with 5 mm lead spacing.

This part targets general-purpose power applications that require low impedance at higher frequencies, sustained ripple handling and extended life at elevated operating temperatures.

Key Features

• Capacitance and Voltage: 390 µF nominal capacitance with an 80 V rated voltage and tolerance of −20% to +20% (120 Hz, 20°C).
• High ripple-current capability: Low-frequency ripple current 1105 mA (1.105 A) at 120 Hz and high-frequency ripple current 2210 mA (2.210 A) at 10 kHz, enabling effective smoothing under dynamic loads.
• Low impedance: Rated impedance of 140 mΩ, supporting lower AC voltage drop and improved performance at higher frequencies.
• Thermal and lifetime performance: Operating temperature range −40°C to 105°C with a life/endurance rating of 12,000 hours at 105°C.
• Loss characteristic: tan δ (loss tangent) specified at 0.09 (20°C, 120 Hz) for stable dissipation behavior under rated conditions.
• Leakage current: Specified leakage current of 312 µA after standard application of rated voltage.
• Compact radial can package: φ12.5×25 mm can (L: 25 mm, D: 12.5 mm) with radial leads, lead spacing 5.0 mm (±0.5 mm), and packaging available in bulk (no terminal forming) or bag packing.
• RoHS compliant: Manufactured in compliance with RoHS requirements.

Typical Applications

• General-purpose power filtering: Bulk filtering and smoothing where 390 µF at 80 V and low impedance reduce voltage ripple across a range of frequencies.
• Switching power supplies: Use where lower impedance and high-frequency ripple handling (2.21 A at 10 kHz) improve transient response and voltage stability.
• Industrial electronics: Systems requiring extended lifetime at elevated temperatures benefit from the 12,000 h endurance rating at 105°C.
• Decoupling in power conversion stages: Compact φ12.5×25 mm footprint and radial lead form factor simplify placement for decoupling and energy buffering tasks.

Unique Advantages

• High ripple-current capability: Handles significant ripple at both low and high frequencies, reducing the need for parallel components to meet ripple requirements.
• Low-impedance performance: 140 mΩ impedance supports better AC performance and lower heat generation under ripple conditions.
• Extended high-temperature life: Rated for 12,000 hours at 105°C, delivering predictable long-term capacitance and dielectric stability in hot environments.
• Compact radial package: φ12.5×25 mm can with 5 mm lead spacing offers a small footprint for space-constrained board layouts while maintaining serviceable capacitance and ripple capacity.
• Measured dissipation and leakage: Specified tan δ of 0.09 and leakage current of 312 µA provide clear parameters for thermal and leakage budgeting in designs.
• RoHS compliance: Built to comply with RoHS, simplifying regulatory considerations for assemblies.

Why Choose UHW1K391MHD?

The UHW1K391MHD combines compact dimensions with high ripple-current handling and low impedance, making it well suited for general-purpose power filtering and decoupling in designs that operate up to 80 V and across a wide temperature range. Its 12,000-hour endurance at 105°C and specified electrical characteristics (tan δ, leakage, impedance) give predictable performance for longer-life industrial applications.

Choose this part when you need a reliable, RoHS-compliant radial electrolytic capacitor that balances size, ripple performance and thermal endurance for stable operation in power conversion and filtering roles.

Request a quote or contact sales to discuss availability, lead times and to obtain volume pricing for UHW1K391MHD.