BYG21KHM3_A/H

Overview

The BYG21KHM3_A/H is a fast avalanche surface-mount rectifier manufactured by Vishay General Semiconductor. It features a glass passivated pellet chip junction in an SMA (DO-214AC) package. The device supports an average forward current of 1.5 A and offers maximum repetitive peak reverse voltages of 800 V or 1000 V depending on the specific variant. Key electrical characteristics include a peak forward surge current of 30 A, a maximum reverse current of 1.0 μA at rated voltage, and a typical forward voltage of 1.6 V at 1.5 A. The component exhibits a fast reverse recovery time of 120 ns and can withstand a non-repetitive pulse energy of 20 mJ in avalanche mode. It operates within a temperature range of -55 °C to +150 °C.

Feature Summary

• Fast reverse recovery time with soft recovery characteristic
• Capable of handling avalanche pulse energy for inductive load switching
• Glass passivated pellet chip junction for low reverse current
• Low profile package suitable for automated placement

Applications

• Fast switching rectification in power supplies
• Inverter and converter circuits
• Freewheeling diodes for consumer electronics
• Automotive electronic systems
• Telecommunication equipment

Procurement Notes

Verify the exact part number suffix against the manufacturer's official documentation to confirm the specific reverse voltage rating (800 V vs. 1000 V) and qualification status. Ensure the ordering code matches the required packaging format and revision level. Cross-reference the datasheet document number 88961 for the most current specifications and compliance details before finalizing procurement orders.

Selection Notes

Select this component for applications requiring high-speed switching and robustness against inductive kickback. The avalanche capability allows it to handle non-repetitive pulse energies up to 20 mJ, making it suitable for freewheeling duties. Consider the thermal resistance values when designing heat dissipation strategies, as performance varies based on mounting conditions on epoxy-glass or ceramic substrates.

Part Context

This device belongs to the BYG21 series of fast avalanche SMD rectifiers from Vishay. It shares the SMA (DO-214AC) footprint with other components in the family but is distinguished by its specific electrical ratings and avalanche endurance. The HM3 suffix indicates a halogen-free, RoHS-compliant version that meets automotive reliability standards.

Replacement Considerations

Direct substitutes within the same series include BYG21KHM3_A/I and BYG21KHE3_A/H. Verify compatibility regarding the specific reverse voltage rating and ensure the replacement maintains the required avalanche energy handling capabilities for the intended circuit application.

FAQ

What is the maximum non-repetitive pulse energy the BYG21KHM3_A/H can withstand?

The device can withstand a maximum non-repetitive pulse energy of 20 mJ in avalanche mode when switched off from an inductive load at a junction temperature of 25 °C.

Does the BYG21KHM3_A/H support avalanche operation?

Yes, the component is designed as a fast avalanche rectifier and is qualified to handle non-repetitive avalanche pulse energies, making it suitable for freewheeling applications.