KBU8G-E4/51

Overview

The KBU8G-E4/51 is a single-phase bridge rectifier from Vishay's KUB8 series, housed in an isolated KBU package. It features a maximum repetitive peak reverse voltage (Vrrm) of 400 V and an average forward rectified current (If) of 8 A at 25°C. The device supports a non-repetitive peak forward surge current (Ifsm) of 300 A. Key electrical parameters include a maximum RMS isolation voltage of 2500 V, a peak forward voltage drop (Vf) of 1.1 V at 8 A, and a maximum reverse leakage current (Ir) of 5 µA at 400 V. The component operates within a junction temperature range of -55°C to +150°C.

Feature Summary

• High thermal stability with a maximum operating junction temperature of 150°C
• Isolated mounting configuration for direct heatsink attachment
• Robust surge current handling capability up to 300 A

Applications

• AC-DC power supply circuits
• Battery chargers
• General-purpose rectification in industrial equipment

Procurement Notes

Verify the specific suffix against official datasheets to confirm voltage ratings and packaging details. Ensure compatibility with existing thermal management designs due to the KBU flange mount style. Confirm RoHS compliance status through manufacturer documentation prior to integration.

Selection Notes

Select this component when a 400 V rating and 8 A continuous current are required in a compact through-hole package. Compare Vf characteristics against alternative KBU variants to optimize efficiency. Verify that the 2500 Vrms isolation voltage meets safety requirements for the target application environment.

Part Context

This part belongs to the KUB8 series of bridge rectifiers designed for high reliability. The KBU package provides a low-profile solution suitable for space-constrained PCB layouts while maintaining effective heat dissipation through the isolated base.

Replacement Considerations

Cross-reference with other Vishay KBU series parts such as KBU6 or KBU10 for current rating adjustments. Verify pinout compatibility before substituting with generic KBU-style rectifiers.