UCY2D391MHD

The UCY2D391MHD is a radial lead aluminum electrolytic capacitor in Nichicon’s UCY series, sized φ18 × 40 mm and polarized for DC applications. It delivers 390 µF capacitance at a 200 V rating with high ripple-current capability and long life performance.

Designed for power supply and ballast applications and qualified to AEC-Q200, the UCY2D391MHD targets systems that require robust ripple handling, stability across −40 °C to 105 °C, and extended endurance under elevated temperature stress.

Key Features

• Electrical Performance: 390 µF nominal capacitance with ±20% tolerance and a rated voltage of 200 V, offering bulk energy storage for DC circuits.
• High Ripple Current: Low-frequency ripple current of 1.78 A (120 Hz) and high-frequency ripple current of 3.56 A (100 kHz), supporting demanding power-filtering and decoupling tasks.
• Long Endurance: Rated for 12,000 hours at 105 °C under rated ripple and DC bias, providing extended operational life in high-temperature environments.
• Thermal & Frequency Characteristics: Operating temperature range −40 °C to 105 °C; dissipation factor (tan δ) 0.20 measured at 20 °C, 120 Hz, with specified ripple-frequency coefficients for performance scaling.
• Leakage & Polarization: Polarized aluminum electrolytic design with measured leakage current of 3,220 µA.
• Mechanical & Packaging: Compact φ18 × 40 mm can with 7.5 mm lead spacing (±0.5 mm); available in bulk (no terminal forming) or bag packing for production assembly.
• Compliance & Qualification: AEC-Q200 rated and RoHS compliant for use in regulated applications and controlled manufacturing environments.

Typical Applications

• Power Supplies: Bulk filtering and smoothing in DC power supplies where high ripple currents and stable capacitance at elevated temperatures are required.
• Ballasts and Lighting Electronics: Energy storage and ripple handling in ballast circuits for lighting applications.
• Automotive Power Electronics: Use in automotive electrical systems and power modules where AEC-Q200 qualification and long-life performance are needed.

Unique Advantages

• High ripple-current handling: Enables reduced heating and improved filtering performance under both low- and high-frequency ripple loads.
• Extended high-temperature life: 12,000-hour endurance at 105 °C enhances reliability and reduces replacement frequency in hot environments.
• Automotive-grade qualification: AEC-Q200 rating supports deployment in automotive and similarly demanding applications.
• Compact radial package: φ18 × 40 mm can with standard 7.5 mm lead spacing simplifies placement in through-hole power designs.
• Regulatory compliance: RoHS conformity supports use in regulated manufacturing and end-products.

Why Choose UCY2D391MHD?

The UCY2D391MHD combines high capacitance (390 µF) and a 200 V rating with elevated ripple-current capability and a long 12,000-hour life at 105 °C, making it a practical choice for engineers designing robust power-supply, ballast, and automotive power electronics. Its AEC-Q200 qualification and RoHS compliance provide assurance for regulated and high-reliability applications.

This radial-lead capacitor is suited to designs that demand stable performance across −40 °C to 105 °C, compact radial packaging, and proven endurance under continuous ripple and DC bias conditions.

Request a quote or contact sales to discuss availability, lead times, and volume pricing for UCY2D391MHD.