1N4946-1/TR

Overview

The Microchip Technology 1N4946-1/TR is a standard recovery rectifier diode designed for general-purpose applications. It features a maximum DC reverse voltage (Vr) of 600 V and an average forward rectified current (Io) of 1 A. The device exhibits a typical reverse recovery time (trr) of 250 ns, classifying it as a fast recovery diode with speeds less than or equal to 500 ns. Forward voltage drop (Vf) is specified at 1.3 V when conducting 1 A. Reverse leakage current is limited to 1 µA at the maximum rated voltage of 600 V. Junction capacitance measures 25 pF at 12 V reverse bias and 1 MHz frequency. The component operates within a junction temperature range of -65°C to +175°C.

Feature Summary

• Provides high-voltage blocking capability up to 600 V with a 1 A continuous current rating for robust power handling.
• Features fast recovery characteristics with a 250 ns reverse recovery time suitable for efficient switching operations.
• Supports extended thermal operation with a junction temperature range extending to +175°C.

Applications

• High-voltage general-purpose rectification in power supply circuits
• Free-wheeling diodes in inductive load switching applications
• DC-AC conversion stages requiring fast recovery performance

Procurement Notes

Verify the specific suffix designation during procurement to ensure correct packaging configuration. The -1/TR suffix indicates tape and reel packaging, which differs from bulk options. Confirm RoHS compliance status and environmental declarations against the latest manufacturer datasheet prior to integration. Ensure the ordering quantity aligns with the reel specifications provided by the supplier to avoid handling discrepancies.

Selection Notes

Select this component when a 600 V reverse voltage rating and 1 A average current capacity are required. The 250 ns reverse recovery time makes it appropriate for applications needing faster switching than standard general-purpose diodes but without the extreme speed of ultra-fast variants. Verify that the axial leaded package fits the board layout constraints and that the operating temperature range meets the system's thermal requirements.

Part Context

This part belongs to the 1N494x series of standard recovery rectifiers manufactured by Microchip Technology. The series offers various voltage ratings while maintaining consistent current handling capabilities. The 1N4946 variant specifically targets higher voltage applications within this family. The component utilizes axial through-hole technology, providing mechanical stability for traditional PCB mounting methods.

Replacement Considerations

The RL105F from SMC Diode Solutions is documented as a parameter-equivalent substitute. Verify pinout compatibility and exact electrical tolerances before substitution. Ensure the alternative component meets the same axial package dimensions and thermal characteristics for direct replacement.