KBL08

Overview

The KBL08 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor, designed for general-purpose AC/DC full-wave rectification. It features a maximum repetitive peak reverse voltage (VRRM) of 800 V and supports a maximum average forward current (IF(AV)) of 4.0 A at an ambient temperature of 50 °C. The device exhibits a maximum instantaneous forward drop (VF) of 1.1 V at 4.0 A and a maximum DC reverse current (IR) of 5.0 μA at 25 °C. It withstands a peak forward surge current (IFSM) of 200 A and operates within a junction and storage temperature range of -50 to +150 °C. The component utilizes a plastic-passivated junction with silver-plated leads in a KBL through-hole package.

Feature Summary

• Plastic-passivated junction construction providing high case dielectric strength of 1500 V RMS
• High surge current capability suitable for demanding power applications
• UL recognition (file number E54214) ensuring compliance with safety standards
• Ideal for printed circuit board mounting with robust mechanical design

Applications

• AC/DC bridge full wave rectification for monitors and televisions
• Power supply units including switch-mode power supplies (SMPS)
• Printers, adapters, audio equipment, and home appliances

Procurement Notes

Verify the specific manufacturer origin before procurement, as the KBL08 part number is utilized by multiple semiconductor vendors including onsemi and Vishay. Confirm the exact datasheet revision and electrical tolerances match your design requirements. Note that the Vishay version of this component has reached its End of Life status, with the last available purchase date specified as July 30, 2025. Ensure alternative sourcing strategies are established if relying on the Vishay specification.

Selection Notes

Select the KBL08 when a single-phase rectifier with an 800 V reverse voltage rating and a 4 A continuous forward current capacity is required. The component is appropriate for designs needing a 200 A non-repetitive surge current tolerance and operation up to a 150 °C junction temperature. Consider the KBL package dimensions and lead configuration for PCB layout compatibility. Evaluate thermal resistance characteristics based on the specific mounting method, whether heatsink-mounted or PCB-mounted.

Part Context

The KBL08 belongs to the KBL series of single-phase bridge rectifiers, which includes variants with different voltage ratings such as KBL005, KBL01, KBL02, KBL04, KBL06, and KBL10. This series is characterized by its standard KBL case style and consistent 4 A average forward current rating across all voltage options. The components are widely used in general-purpose rectification circuits where reliable performance and compact through-hole packaging are prioritized.

Replacement Considerations

Publicly confirmed substitute part numbers include GBU408-G from Comchip Technology and KBL408-G from Taiwan Semiconductor Corporation. These alternatives offer similar electrical specifications and package styles for direct replacement in existing designs.