KBU4K-E4/51

Overview

The KBU4K-E4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division. It features a peak repetitive reverse voltage (Vrrm) of 800 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. It operates within a junction temperature range of -50 °C to +150 °C and exhibits a low reverse leakage current (Ir) of 5 μA. The component utilizes a KBU through-hole package with four pins, measuring 23.7 mm in length and 19.3 mm in height.

Feature Summary

• High-voltage capability with 800 V reverse blocking rating for robust AC-to-DC conversion
• Through-hole mounting configuration designed for secure PCB integration
• Wide thermal operating range supporting high-temperature industrial environments

Applications

• General-purpose AC-to-DC power supply circuits
• Industrial control systems requiring high reverse voltage isolation
• Power adapter designs utilizing through-hole assembly processes

Procurement Notes

Verify the specific suffix /51 against official Vishay documentation to confirm packaging details and compliance status. Ensure the 800 V rating aligns with circuit requirements. Cross-reference the manufacturer part number with authorized distributors to confirm current production status and availability constraints before finalizing procurement plans.

Selection Notes

Select this component when an 800 V reverse voltage rating is required alongside a 4 A continuous current capacity. The KBU package offers a compact footprint suitable for space-constrained through-hole layouts. Compare the 200 A surge current capability against potential inrush conditions in the target application to ensure adequate safety margins during startup phases.

Part Context

This component belongs to the Vishay KBU4 series of single-phase bridge rectifiers. The series provides standardized performance across various voltage ratings while maintaining consistent physical dimensions and pin configurations. The KBU4K variant specifically addresses applications demanding higher reverse voltage withstand capabilities compared to lower-rated siblings in the same family.

Replacement Considerations

Compatible substitutes include other Vishay KBU4 series variants with matching 800 V ratings, such as KBU4G or KBU4J, provided they share identical pinout and mechanical specifications. Verify that alternative manufacturers offer equivalent Vf and Ir characteristics to maintain circuit performance integrity.