KBU4B-M3/P

Overview

The KBU4B-M3/P 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 100 V and an average forward rectified current (Io) of 4 A at 25 °C. The device supports a peak non-repetitive surge current (Ifsm) of 200 A for one cycle at 60 Hz. Key electrical characteristics include a maximum forward voltage drop (Vf) of 1.1 V at 4 A and a reverse leakage current (Ir) of 5 µA at 100 V. It operates within a junction temperature range of -55 °C to +150 °C.

Feature Summary

• High surge current capability with 200 A rating for robust transient protection
• Low forward voltage drop of 1.1 V to minimize conduction losses
• Compact KBU surface-mount footprint for efficient PCB space utilization
• Wide operating junction temperature range up to 150 °C

Applications

• AC-DC power supply input stages
• Battery charging circuits
• General-purpose rectification in industrial equipment

Procurement Notes

Verify the specific suffix /P against official Vishay documentation to confirm packaging details, as suffixes often denote tape-and-reel or bulk variations. Ensure the component meets RoHS directives if required by your design specifications. Cross-reference the exact part number with authorized distributors to confirm availability and authenticity before procurement.

Selection Notes

Select this component when a 100 V rating and 4 A continuous current are sufficient for the application. The KBU package offers a balance between thermal performance and board space compared to larger through-hole alternatives. Consider the 1.1 V forward voltage drop impact on efficiency at full load. Verify that the 200 A surge rating exceeds the expected inrush currents in the target circuit.

Part Context

This part belongs to the KBU4 series of single-phase bridge rectifiers. The 'M3' suffix typically indicates lead-free composition compliant with EU RoHS standards. The KBU series is designed for surface-mount applications, providing mechanical stability and reliable soldering for automated assembly processes in consumer and industrial electronics.

Replacement Considerations

Direct replacements must match the 100 V Vrrm, 4 A Io, and KBU package dimensions. Check for equivalent Vf and Ir specifications to ensure similar thermal performance. Verify pinout compatibility and mounting hole positions if mechanical constraints are critical.