FLLDU040A445I0

Overview

The KEMET FLLDU040A445I0 is a high-voltage film capacitor designed for demanding power electronics applications. It features a metallized polypropylene dielectric and an epoxy resin encapsulation, providing robust mechanical stability and environmental resistance. The component is rated for a nominal capacitance of 4.4 microfarads with a tolerance of ±10%, ensuring precise performance in critical circuits. It supports a continuous DC voltage of 400 volts and withstands surge voltages up to 800 volts, making it suitable for harsh electrical environments. The unit utilizes radial leads for straightforward through-hole mounting on printed circuit boards.

Feature Summary

• Metallized polypropylene dielectric for low loss and high reliability
• Epoxy resin encapsulation for enhanced mechanical strength and moisture resistance
• Radial lead configuration for efficient PCB integration

Applications

• DC link filtering in power converters
• Snubber circuits for IGBT and MOSFET protection
• High-frequency pulse applications requiring stable capacitance

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm lead length, pitch, and marking details. Ensure that the thermal rating and surge voltage capabilities align with the system's operational requirements. Cross-reference the part number with official KEMET documentation to validate compliance with RoHS directives and other relevant regulatory standards before finalizing procurement.

Selection Notes

Select this component when high voltage stability and low dissipation factor are required in compact designs. Evaluate the physical dimensions and lead spacing to ensure compatibility with the target PCB layout. Consider the operating temperature range and derating curves to maintain reliability under varying load conditions. Confirm that the surge voltage rating exceeds the peak transient voltages expected in the application circuit.

Part Context

This capacitor belongs to KEMET's FLL series of high-voltage film capacitors, which are engineered for durability in industrial and automotive power systems. The series is characterized by its ability to handle high ripple currents and resist mechanical stress. Components in this family typically offer long service life due to self-healing properties inherent in metallized films. They are commonly used where space constraints limit the use of larger electrolytic alternatives.

Replacement Considerations

Consult official KEMET substitution guides or distributor cross-reference tools for verified equivalent parts. Ensure any replacement matches the capacitance value, voltage ratings, and physical footprint. Verify that alternative components meet the same safety certifications and environmental specifications as the original part.