KBJ408G

Overview

The KBJ408G is a single-phase standard recovery bridge rectifier manufactured by Diodes Incorporated. It provides an average rectified output current of 4.0 A and supports a maximum repetitive peak reverse voltage of 800 V. The component features a forward voltage of 1.0 V at 2.0 A and a maximum leakage current of 5.0 µA at rated voltage. It withstands a peak forward surge current of 120 A for 8.3 ms. Operating temperatures range from -55°C to +150°C, with a typical thermal resistance of 5.5 °C/W. The device utilizes glass passivated die construction and is housed in a KBJ through-hole package.

Feature Summary

• Glass passivated die construction ensures low reverse leakage current and high reliability.
• High case dielectric strength of 1500 VRMS provides robust insulation.
• Surge overload rating up to 120 A peak handles transient electrical events.
• UL recognized component (File Number E95060) facilitates compliance in end products.

Applications

• Printed circuit board applications requiring compact bridge rectification
• General-purpose AC to DC conversion circuits
• Power supply designs operating within the specified voltage and current limits

Procurement Notes

Verify the specific ordering suffix 'G' corresponds to lead-free and RoHS compliant specifications as defined by Diodes Incorporated. Confirm that the tube packaging quantity matches the required production volume. Ensure the procurement channel is authorized to maintain warranty validity and traceability standards established by the manufacturer.

Selection Notes

Select this component when an 800 V blocking capability is required alongside a 4.0 A continuous current rating. The KBJ package is suitable for through-hole mounting using #6 screws with a maximum torque of 5.0 in-lbs. Consider the 1.0 V forward voltage drop for thermal management calculations in low-voltage output applications.

Part Context

This part belongs to the KBJ4005G–KBJ410G series, which shares identical mechanical dimensions and thermal characteristics across different voltage ratings. The series covers voltages from 50 V to 1000 V while maintaining a constant 4.0 A current capacity. The KBJ408G specifically addresses applications needing 800 V isolation.

Replacement Considerations

Direct substitutes include other manufacturers' KBJ408 variants such as MCC KBJ408GL-BP or generic KBL408G equivalents, provided they match the 800 V, 4 A, and KBJ package constraints. Verify pinout compatibility and thermal resistance values before substitution.

FAQ

What is the maximum RMS voltage for the KBJ408G?

The maximum RMS voltage is 560 V.

How is the polarity indicated on the component?

Polarity is molded directly onto the body of the component.

What is the typical junction capacitance?

The typical junction capacitance is 40 pF, measured at 1.0 MHz and 4.0 V DC reverse voltage.