UHW1E391MPD

The UHW1E391MPD is a radial-lead aluminum electrolytic capacitor in Nichicon’s UHW series, offering 390 µF capacitance at a 25 V rating in a compact φ8 × 15 mm can. Designed for general-purpose power filtering and decoupling, it targets compact electronic assemblies that require high ripple handling and long-term reliability.

Key value comes from a miniature footprint combined with low impedance at higher frequencies and rated endurance at elevated temperature, making it suitable for space-constrained boards where sustained ripple performance and lifetime are required.

Key Features

• Capacitance and Voltage — 390 µF nominal capacitance with a 25 V rated voltage and ±20% tolerance for bulk energy storage and smoothing.
• High Ripple Capability — Low-frequency ripple current of 800 mA (120 Hz) and high-frequency ripple current of 1.6 A (10 kHz) to support demanding AC superposition on DC rails.
• Low Impedance — Specified impedance of 170 mΩ and series-design notes indicating lower impedance at high frequency ranges for improved filtering performance.
• Loss Characteristics — Tangent of loss angle (tan δ) of 0.13 measured at 20°C, 120 Hz, for predictable dissipation behavior in design calculations.
• Leakage and Reliability — Measured leakage current of 97.5 µA and a rated endurance of 10,000 hours at 105°C, enabling long-term operation under elevated temperature and DC bias with ripple.
• Compact Radial Package — φ8 × 15 mm can with 3.5 mm lead spacing (±0.5 mm) and radial lead mounting for hand or through-hole assembly; available in bulk or bag packing.
• Wide Operating Temperature — −40°C to +105°C operating range suitable for many industrial and commercial environments.
• RoHS Compliant — Meets RoHS directive requirements for lead-free environmental compliance.

Typical Applications

• Power Supply Filtering — Bulk smoothing and decoupling on compact DC power supplies where 25 V rating and 390 µF capacitance stabilize output rails.
• Point-of-Load Support — Local energy storage and high-frequency ripple handling for point-of-load converters and regulator outputs in space-constrained assemblies.
• Industrial Control Electronics — Filtering and transient absorption in control modules that require long endurance at elevated temperatures.
• Communications and Networking Modules — Decoupling of supply lines where reduced impedance at higher frequencies improves signal integrity and regulator stability.

Unique Advantages

• Miniature footprint with strong ripple capability: φ8 × 15 mm size delivers 390 µF while supporting 800 mA (120 Hz) and 1.6 A (10 kHz) ripple currents for compact designs that still require significant AC handling.
• Predictable thermal and lifetime performance: Rated for 10,000 hours at 105°C, allowing designers to specify long-term reliability under continuous elevated-temperature operation.
• Low impedance at higher frequencies: Series characteristics and a measured 170 mΩ impedance help reduce voltage ripple and improve regulator loop behavior.
• Through-hole radial form factor: Radial lead mounting with 3.5 mm spacing supports robust mechanical retention and simple PCB assembly for retrofit or hand-soldered designs.
• Verifiable loss and leakage metrics: Specified tan δ (0.13 at 20°C, 120 Hz) and leakage current (97.5 µA) give clear parameters for thermal and standby current budgeting.
• RoHS compliance: Meets environmental directive requirements for lead-free assemblies.

Why Choose UHW1E391MPD?

The UHW1E391MPD balances a small can size with robust ripple-handling and documented endurance, making it well suited for compact power systems that demand predictable filtering and long-term stability. Its low impedance at higher frequencies and defined electrical parameters give engineers the data needed to optimize regulator performance and thermal design.

This part is appropriate for designers of consumer, industrial, and communications equipment who need a reliable, through-hole aluminum electrolytic capacitor with verified ripple, leakage, and lifetime specifications and RoHS compliance.

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