1N4945

Overview

The Microchip Technology 1N4945 is a general-purpose silicon rectifier diode designed for high-voltage applications. It features a maximum repetitive peak reverse voltage of 500V and an average forward rectified current rating of 1A. The device utilizes glass passivation for junction protection, ensuring reliable operation under demanding electrical conditions. It is housed in the DO-41 axial leaded package, which facilitates through-hole mounting on printed circuit boards. The component is rated for a maximum operating junction temperature of 175°C, providing robust thermal performance for industrial and commercial power supply circuits.

Feature Summary

• Glass passivated for enhanced junction protection
• High voltage capability up to 500V
• Rated for 1A average forward current
• Suitable for general purpose rectification

Applications

• Power supply rectification
• General purpose switching
• Inverter circuits

Procurement Notes

Verify the manufacturer designation carefully, as multiple vendors produce components with this standard part number. Confirm that the specific unit received matches the required electrical specifications and physical package dimensions. Ensure compliance with RoHS directives if applicable to your assembly process. Cross-reference datasheets from authorized distributors to validate technical parameters before integration into production designs.

Selection Notes

Select this component when a standard 500V, 1A rectifier is required for through-hole PCB assembly. The DO-41 package offers mechanical stability for automated insertion processes. Consider the 175°C junction temperature rating for environments with elevated thermal loads. This diode serves as a direct replacement for legacy designs utilizing standard silicon rectifiers in similar voltage and current ranges.

Part Context

The 1N4945 belongs to the broader family of general-purpose silicon rectifier diodes commonly used in electronic power conversion. It shares functional similarities with other axial leaded rectifiers but is distinguished by its specific 500V blocking voltage and 1A current handling capacity. Microchip Technology manufactures this component to meet industry standards for reliability and performance in consumer and industrial electronics.

Replacement Considerations

Equivalent parts include the 1N4004 series for lower voltage requirements or other 500V 1A rectifiers such as those from Central Semiconductor Corp. Verify pinout compatibility and package dimensions when substituting. Ensure the alternative component meets the same thermal and electrical ratings for safe operation.