1N4946-1

Overview

The Microchip Technology 1N4946-1 is a standard rectifier diode designed for through-hole axial mounting. 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 fast recovery time of 250 ns, classifying it as suitable for applications requiring speeds up to 500 ns with currents exceeding 200 mA. Forward voltage drop is specified at 1.3 V when conducting 1 A. Reverse leakage current is limited to 1 µA at the maximum rated reverse voltage. 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 rectification capability with a 600 V reverse voltage rating.
• Delivers 1 A continuous average forward current in a robust axial leaded package.
• Features a 250 ns reverse recovery time for efficient switching performance.
• Supports extended thermal operation with a junction temperature range up to 175°C.

Applications

• High-voltage power supply rectification circuits
• General-purpose freewheeling diodes in inductive load protection
• Fast recovery rectification in consumer electronics

Procurement Notes

Verify the specific ordering suffix and manufacturing origin upon purchase, as production may occur at multiple facilities. Confirm compliance requirements such as RoHS or REACH status directly with the supplier, as environmental declarations can vary by production batch. Ensure the axial leaded package dimensions match the target PCB footprint before finalizing procurement orders.

Selection Notes

Select this component when a 600 V blocking voltage and 1 A current capacity are required in a through-hole configuration. The 250 ns recovery time makes it appropriate for general-purpose fast recovery applications rather than ultra-high-speed switching. Verify that the 1.3 V forward voltage drop aligns with the system's efficiency targets and thermal management capabilities.

Part Context

This part belongs to the 1N494x series of fast recovery rectifiers manufactured by Microchip Technology. The series offers standardized axial packages for reliable through-hole integration. The 1N4946-1 variant specifically provides the highest voltage rating within the common 1N494x family, distinguishing it from lower-voltage counterparts like the 1N4944 or 1N4945.

Replacement Considerations

The 1N4946-1/TR is a parameter-equivalent alternative from Microchip Technology. Cross-manufacturer substitutes such as the RL105F from SMC Diode Solutions share similar electrical specifications but require verification of package compatibility and reverse recovery characteristics.