1N646-1

Overview

The 1N646-1 is a standard silicon rectifier diode manufactured by Microchip Technology. It features a maximum DC reverse voltage of 300 V and an average forward current rating of 400 mA. The device exhibits a forward voltage drop of 1 V at the rated current and maintains a low reverse leakage current of 50 nA at maximum reverse voltage. Designed for through-hole mounting, it utilizes the DO-35 (DO-204AH) axial leaded package. The component supports a wide operating junction temperature range from -65°C to +175°C and offers standard recovery characteristics with a time exceeding 500 ns.

Feature Summary

• Standard rectification capability with high thermal stability
• Robust axial leaded construction for reliable through-hole integration
• Low leakage current performance under maximum reverse bias conditions

Applications

• General-purpose power supply rectification circuits
• High-voltage DC blocking applications
• Industrial control system protection stages

Procurement Notes

Verify the specific manufacturing date code and lot traceability upon receipt to ensure compliance with project requirements. Confirm that the received components match the DO-35 package dimensions and terminal finish specifications outlined in the official datasheet. Inspect leads for straightness and solderability prior to assembly to prevent mechanical stress during PCB insertion.

Selection Notes

Select this component when a through-hole solution is required for moderate current rectification up to 400 mA. The 300 V reverse voltage rating provides sufficient margin for many standard AC-to-DC conversion tasks. Consider the extended temperature range if the application environment exceeds typical commercial limits. Ensure the circuit design accounts for the standard recovery speed, which may not be suitable for high-frequency switching applications.

Part Context

This part belongs to the standard discrete diode family produced by Microchip Technology. It serves as a fundamental passive semiconductor component within larger electronic assemblies. The DO-35 package represents a traditional form factor widely used in legacy and robust industrial designs where surface-mount alternatives are unsuitable due to space or reliability constraints.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent DO-35 packaged standard diodes with matching 300 V and 400 mA ratings. Verify pinout compatibility and physical dimensions before substitution. Ensure replacement parts meet the same thermal and electrical safety standards.