KBU4G-E4/51

Overview

The KBU4G-E4/51 is a single-phase bridge rectifier from Vishay General Semiconductor, utilizing the KBU surface-mount package. It features a peak repetitive reverse voltage (Vrrm) of 400 V and an average forward rectified current (If) of 4 A. The device supports a peak non-repetitive forward surge current (Ifsm) of 200 A with a maximum forward voltage drop (Vf) of 1 V at rated current. Operating junction temperature ranges from -55°C to +150°C, with a storage temperature range of -50°C to 150°C. Reverse leakage current is specified at 5 μA.

Feature Summary

• Robust construction in a compact KBU surface-mount package for efficient PCB space utilization.
• High thermal stability supporting continuous operation up to a junction temperature of 150°C.
• Low forward voltage drop characteristics contribute to reduced power dissipation and improved efficiency.

Applications

• AC-DC power supply circuits requiring compact bridge rectification.
• General-purpose rectification in consumer electronics and appliances.
• Battery charging systems and DC power output stages.

Procurement Notes

Verify the complete part number including suffixes such as E4/51 to ensure compliance with specific material and packaging requirements. Confirm that the KBU footprint matches the target PCB design. Cross-reference datasheet parameters against application load conditions to validate thermal performance under actual operating scenarios.

Selection Notes

Select this component when a surface-mount solution is required for 400 V applications with moderate current demands. Compare the 4 A rating against circuit peak loads to ensure adequate margin. Consider the KBU package dimensions for mechanical clearance and verify compatibility with automated placement equipment if high-volume manufacturing is planned.

Part Context

This part belongs to the KBU4 series of single-phase bridge rectifiers from Vishay. The 'G' designation indicates a 400 V voltage rating within this family. Other variants in the series offer different voltage ratings such as 200 V or 800 V while maintaining similar current handling capabilities and package form factors for design flexibility.

Replacement Considerations

Direct replacements must match the 400 V rating, 4 A current capacity, and KBU package outline. Verify pinout compatibility and thermal characteristics. Alternative manufacturers offering equivalent specifications in the same surface-mount footprint should be evaluated for electrical equivalence and mechanical fit.