1N4937

Overview

The onsemi 1N4937 is an axial-lead fast-recovery rectifier designed for high-efficiency applications. It features a peak repetitive reverse voltage of 600 V and supports an average rectified forward current of 1.0 A at 75°C ambient temperature. The device exhibits a typical reverse recovery time of 150 ns, with a maximum rating of 200 ns under specified test conditions. It withstands a non-repetitive peak surge current of 30 A and operates within a junction temperature range of -65°C to +150°C.

Feature Summary

• Fast recovery characteristics optimized for high-frequency operation up to 250 kHz
• Low leakage current capability suitable for sensitive circuit environments
• Robust thermal performance with defined junction-to-ambient resistance

Applications

• DC power supplies
• Inverters and converters
• Free wheeling diodes
• Ultrasonic systems

Procurement Notes

Verify the specific ordering suffix when purchasing. The base part number denotes standard bag packaging, while adding the RL suffix indicates tape and reel shipping. Confirm Pb-Free status requirements, as the G suffix explicitly denotes lead-free construction. Ensure the selected variant matches the required mechanical mounting style and quantity constraints for your assembly process.

Selection Notes

Select this component for circuits requiring fast switching speeds and moderate current handling. The 600 V rating provides sufficient margin for general-purpose rectification tasks. Consider the thermal derating curves if operating near the maximum temperature limits. Verify that the package dimensions align with the available PCB footprint and that the lead solderability meets the manufacturing standards.

Part Context

This device belongs to the 1N493x series of axial-lead fast-recovery rectifiers manufactured by onsemi. The series includes variants with different voltage ratings, such as the 1N4933 through 1N4936. The 1N4937 specifically represents the 600 V rating within this lineup. These components are classified as Preferred Devices, indicating they are recommended for future use and offer optimal value within the manufacturer's portfolio.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4937 equivalents, such as Rectron 1N4937-T or Vishay 1N4937-E3/73. When replacing, verify that the replacement part maintains the same DO-41 package outline and meets or exceeds the 600 V reverse voltage and 1 A forward current specifications.