GBU8B

Overview

The onsemi GBU8B is a single-phase rectifier bridge rated for an 800 V repetitive peak reverse voltage (Vrrm) and an average forward rectified current (Io) of 8 A. It utilizes the GBU surface-mount package with four pins, designed for through-hole mounting on printed circuit boards. The device features a maximum non-repetitive peak forward surge current (Ifsm) of 200 A at a single half-sine wave. Electrical characteristics include a maximum RMS isolation voltage of 4000 Vrms and a typical junction-to-case thermal resistance (RthJC) of 1.5 °C/W. Operating temperatures range from -55°C to +150°C.

Feature Summary

• Glass-passivated die construction ensures reliable operation under high-temperature conditions.
• Molded plastic case provides mechanical robustness and meets UL flammability classification 94V-0.
• High surge current capability supports transient overload events in power supply circuits.

Applications

• AC-DC converter modules
• Power supply units
• Battery chargers

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package dimensions and pinout alignment with design requirements. Ensure compliance with relevant safety standards such as UL and IEC before integration into certified equipment.

Selection Notes

Select this component when an 800 V blocking voltage and 8 A continuous current are required in a compact surface-mount form factor. Evaluate thermal management needs based on the specified thermal resistance and expected ambient operating temperatures.

Part Context

This part belongs to the GBU series of bridge rectifiers from onsemi. It shares the standard GBU footprint with other variants like GBU6B or GBU8K, differing primarily in voltage and current ratings. The series is widely used in general-purpose power conversion applications requiring robust performance.

Replacement Considerations

Direct substitutes include equivalent 8A/800V bridge rectifiers in the GBU package from other manufacturers, provided electrical parameters and pin configurations match exactly. Verify thermal and mechanical compatibility during replacement.

FAQ

What is the maximum repetitive peak reverse voltage?

The maximum repetitive peak reverse voltage (Vrrm) is 800 V.

Is the device suitable for high-temperature environments?

Yes, the junction temperature range extends up to +150°C, supporting high-temperature operation.

What is the thermal resistance from junction to case?

The typical junction-to-case thermal resistance (RthJC) is 1.5 °C/W.