1N4937

Overview

The Diotec Semiconductor 1N4937 is a fast recovery rectifier diode housed in a DO-204AL (DO-41) plastic package. It features a maximum average forward current of 1 A and supports repetitive peak reverse voltages up to 600 V. The device exhibits a low forward voltage drop of less than 1.2 V at 1 A and 25°C, with a typical junction capacitance of 15 pF. Reverse recovery time is specified as under 200 ns. Thermal resistance from junction to ambient is typically 45 K/W, while junction-to-lead resistance is 15 K/W. Operating temperatures range from -50°C to +150°C for the junction and -50°C to +175°C for storage.

Feature Summary

• Fast switching capability designed for high efficiency applications
• Low leakage current characteristics ensuring minimal power loss
• High forward surge current tolerance for robust operation
• Void-free molded plastic construction for mechanical stability

Applications

• Fast switching rectification in power supplies
• Inverter and converter circuits
• Freewheeling diodes for consumer electronics

Procurement Notes

Verify the specific manufacturer source when sourcing this component, as the 1N4937 designation is utilized by multiple semiconductor producers including Diotec, Vishay, and onsemi. Confirm that the received parts match the exact electrical specifications required for your circuit design, particularly regarding reverse recovery time and forward voltage thresholds. Ensure compliance with relevant environmental directives applicable to your region before integration.

Selection Notes

Select this component for general-purpose rectification tasks requiring fast recovery speeds within standard commercial or industrial reliability grades. It is suitable for applications where moderate surge currents are expected and compact axial packaging is preferred. Evaluate thermal management requirements based on the specified junction-to-ambient thermal resistance to ensure stable operation under continuous load conditions.

Part Context

This part belongs to the 1N493x series of fast recovery rectifiers, which covers a voltage range from 50 V to 600 V. The 1N4937 specifically represents the 600 V variant within this family. These diodes are widely used in standard electronic equipment due to their balance of speed, current handling, and cost-effectiveness. They serve as reliable solutions for converting AC to DC in various power conversion stages.

Replacement Considerations

Cross-reference with other manufacturers' 1N4937 equivalents such as those from Vishay or onsemi. Verify pinout compatibility and package dimensions (DO-41) to ensure physical fit. Check datasheets for any variations in reverse recovery time or thermal ratings that might impact performance in sensitive designs.