KBU4D

Overview

The onsemi KBU4D is a single-phase bridge rectifier designed for general-purpose power supply applications. It integrates four diodes in a single package to facilitate AC-to-DC conversion. The device features a maximum repetitive peak reverse voltage of 400 V and a continuous average forward rectified current of 4 A. It utilizes a glass passivation chip junction, which provides protection against mechanical stress and ensures stable electrical performance across varying operating conditions. The component is rated for a maximum non-repetitive peak surge current of 125 A at specified pulse durations.

Feature Summary

• Integrates four diodes into a single compact bridge configuration
• Utilizes glass passivation for enhanced mechanical stability
• Supports high surge current handling capabilities

Applications

• General-purpose full-wave bridge rectification
• AC to DC power supply circuits
• Battery charging systems

Procurement Notes

Verify the specific ordering suffix to confirm compliance with RoHS directives and halogen-free status, as packaging variations may exist. Confirm the lead frame material and terminal finish specifications to ensure compatibility with intended soldering processes and environmental regulations before finalizing procurement.

Selection Notes

Select this component when a 4 A average current rating and 400 V reverse voltage are required for space-constrained designs. Ensure the thermal management strategy accounts for the package's thermal resistance characteristics under expected load conditions. Verify that the surge current requirements do not exceed the specified non-repetitive peak limits during startup or fault conditions.

Part Context

The KBU4D belongs to the KBU series of bridge rectifiers from onsemi, which offers various voltage and current ratings within the same physical footprint family. This series is engineered to replace discrete diode arrangements, simplifying PCB layout and reducing assembly complexity while maintaining reliable performance in standard industrial and consumer electronics applications.

Replacement Considerations

Cross-reference with other KBU series variants such as KBU4G or KBU8G for different current or voltage requirements. Verify pinout compatibility and thermal characteristics when substituting with equivalent bridge rectifiers from other manufacturers to ensure seamless integration without circuit redesign.