1N4938TR

Overview

The Fairchild Semiconductor 1N4938TR is a small signal switching diode manufactured by onsemi. It features a maximum DC reverse voltage of 200 V and an average rectified current of 500 mA. The forward voltage is specified at a maximum of 1 V when tested at 100 mA. Key electrical characteristics include a reverse recovery time of 50 ns and a maximum reverse leakage current of 100 nA at 200 V. The device operates within a junction temperature range of -65°C to 175°C.

Feature Summary

• Standard small signal switching technology for general-purpose applications
• High thermal stability with a maximum junction temperature rating of 175°C
• Fast reverse recovery performance suitable for high-speed switching circuits

Applications

• General purpose rectification in low-power electronic circuits
• High-speed switching applications requiring fast recovery times
• Clamping and protection circuits in consumer electronics

Procurement Notes

Verify the specific manufacturer designation, as this component is produced under the onsemi brand following corporate restructuring. Confirm that the ordering suffix 'TR' corresponds to the tape and reel packaging format required for automated assembly processes. Ensure compliance with RoHS status requirements for the specific production batch.

Selection Notes

Select this component for designs requiring a standard silicon rectifier with a 200 V blocking capability and 500 mA continuous current handling. The DO-35 axial package is appropriate for through-hole mounting. Consider the 50 ns reverse recovery time when evaluating suitability for frequencies higher than those handled by standard slow-recovery diodes.

Part Context

This part belongs to the widely used 1N49xx series of glass-passivated junction rectifiers. These components are standardized across multiple manufacturers, including Fairchild, Microchip, and others. The 1N4938 variant specifically denotes the 200 V rating within this family, distinguishing it from lower or higher voltage counterparts like the 1N4937 or 1N4939.

Replacement Considerations

Direct substitutes include the 1N4938 from other manufacturers such as Microchip (e.g., 1N4938-1) or generic equivalents meeting the same JEDEC specifications. Verify that replacement parts maintain the identical DO-35 package outline and electrical parameters to ensure mechanical and functional compatibility.