LNUN7681MTEF

The LNUN7681MTEF is a screw-terminal aluminum electrolytic capacitor from Nichicon's LNU series, offering a high-voltage, smaller-sized solution for industrial power electronics. It is designed for inverter circuitry and high-frequency regenerative systems, providing robust performance under high ripple and rapid charge–discharge conditions.

Key characteristics include a 680 µF capacitance at DC 525 V, operation over –40 °C to +105 °C, and a rated load life of 5000 hours at 105 °C. The part is RoHS compliant.

Key Features

• Core Electrical — 680 µF rated capacitance with ±20% tolerance (120 Hz, 20 °C) and polarized construction for DC energy storage.
• High Voltage Rating — Rated voltage up to DC 525 V, suitable for high-voltage inverter and regenerative circuits.
• Thermal & Reliability — Operating temperature range of –40 °C to +105 °C and load life of 5000 hours at 105 °C when subjected to rated ripple current.
• Ripple & Frequency Performance — Ripple current capability specified as 4.4 A at 120 Hz and 6.16 A at 10 kHz, supporting high-frequency inverter and regenerative loads.
• Charge–Discharge Endurance — Specified endurance for 50 million charge–discharge cycles (ΔV = rated voltage ±0.3, 3 Hz), with defined limits on capacitance change, tan δ, and leakage current after testing.
• Mechanical & Mounting — Radial can with screw terminals and stud/bolt mounting; physical size L: 8.5 × D: 5.1 cm and maximum seated height 3.346 inch for compact installation.
• Leakage & Safety — Leakage current after 5 minutes not more than 3√(C·V) µA or 5 mA (whichever is smaller); insulation resistance greater than 100 MΩ at DC 500 V between terminal and bracket.
• Environmental Compliance — Compliant with the RoHS directive (2011/65/EU, (EU)2015/863).

Typical Applications

• Industrial Inverter Power Supplies — Energy storage and smoothing in DC-link circuits for general-purpose and industrial inverter designs.
• AC Servomotor Regeneration — Handles high-frequency regenerative voltage in servo drives and motor control systems where rapid charge–discharge occurs.
• High-Speed Charge–Discharge Circuits — Suited for applications requiring repeated, fast charge–discharge cycles thanks to specified endurance testing.

Unique Advantages

• High-Voltage Capability: Rated to DC 525 V to accommodate demanding inverter and regenerative system voltages.
• Compact High-Voltage Form Factor: Smaller-sized LNU-series design compared to the LNT series, enabling space savings in power assemblies.
• Designed for High Ripple: Defined ripple current ratings at 120 Hz and 10 kHz support stable operation under continuous AC stress.
• Long Thermal Life: 5000 hours load life at 105 °C under rated ripple current provides predictable service life in elevated-temperature environments.
• Robust Cycle Endurance: Proven to meet performance criteria after 50 million charge–discharge cycles, addressing durability needs in regenerative applications.
• Regulatory Compliance: RoHS compliance ensures the part meets common environmental substance restrictions.

Why Choose LNUN7681MTEF?

The LNUN7681MTEF is positioned for designers of industrial power electronics who need a compact, high-voltage electrolytic capacitor with proven endurance under ripple and rapid charge–discharge conditions. Its 525 V rating, defined ripple current capability, and 5000-hour life at 105 °C make it suitable for inverter DC-links and regenerative motor-drive circuits.

Choose this part when your design priorities include high-voltage handling, compact mounting via screw terminals, and specified long-term performance in elevated-temperature, high-frequency environments.

Request a quote or contact sales to discuss pricing, availability, and how LNUN7681MTEF can meet your inverter and regenerative power design requirements.