BY399

Overview

The BY399 is a fast recovery rectifier diode manufactured by Diotec Semiconductor, belonging to the BY396-BY399 series. It features an average forward current (IFAV) of 3 A and a peak repetitive reverse voltage (VRRM) of 800 V. The device exhibits a maximum forward voltage (VF) of less than 1.2 V at 3 A and a reverse recovery time (trr) under 500 ns. It supports a peak forward surge current (IFSM) of up to 110 A and operates within a junction temperature range of -50°C to +150°C.

Feature Summary

• Fast recovery characteristics with reverse recovery time under 500 ns for high-efficiency switching
• High surge current capability supporting up to 110 A non-repetitive peak forward surge
• Low forward voltage drop below 1.2 V at rated current to minimize conduction losses
• Robust thermal performance with junction-to-ambient resistance of 25 K/W

Applications

• High-frequency switching power supplies
• Free-wheeling rectification in inductive load circuits
• Polarity protection in DC power systems
• General-purpose rectification in industrial electronics

Procurement Notes

Verify the specific part number suffix against the official Diotec Semiconductor datasheet to confirm electrical ratings and package type. Ensure compliance with RoHS directives if required by your application standards. Confirm that the supplier provides valid traceability documentation for the semiconductor batch. Check for any recent product change notices (PCN) regarding material or manufacturing site updates before finalizing procurement orders.

Selection Notes

Select this component when applications require high voltage blocking capabilities combined with fast switching speeds. The 800 V rating makes it suitable for mains-connected or high-voltage DC bus applications. Consider the thermal resistance values for heatsinking requirements in enclosed environments. Compare the reverse recovery time against slower standard recovery diodes to ensure compatibility with high-frequency PWM control schemes.

Part Context

This component is part of the BY396 through BY399 series from Diotec Semiconductor, which are designed as fast recovery rectifiers. These devices are engineered to replace older silicon rectifier technologies in modern high-efficiency power conversion topologies. The series shares common packaging and pinout configurations while varying primarily in voltage ratings, allowing for standardized design layouts across different voltage classes.

Replacement Considerations

Public confirmed substitute part numbers include RGP30K and RGP30M.