1N4938-1/TR

Overview

The Microchip Technology 1N4938-1/TR is a small signal switching diode designed for computer and general-purpose applications. It features a peak repetitive reverse voltage of 175 V and an average forward rectified current of 100 mA. The device operates within a junction temperature range of -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 100 nA at 175 V, a forward voltage drop of 1 V at 100 mA, and a reverse recovery time of 50 ns. It is housed in the DO-204AH (DO-35) axial through-hole package.

Feature Summary

• Provides fast switching performance with a 50 ns reverse recovery time suitable for high-speed digital circuits.
• Capable of withstanding high thermal stress with a maximum junction temperature rating of +175°C.
• Offers low reverse leakage current to maintain circuit integrity under reverse bias conditions.

Applications

• Computer logic interface circuits
• General purpose signal switching
• High frequency rectification

Procurement Notes

Verify that the suffix /TR indicates tape and reel packaging rather than bulk, as standard 1N4938-1 units are typically supplied in bulk. Confirm RoHS compliance status, as the base 1N4938 series often carries non-RoHS designations. Ensure the supplier provides official Microchip documentation matching the specific suffix to guarantee correct physical form factor and handling requirements.

Selection Notes

Select this component when a robust axial leaded diode is required for high-temperature environments up to 175°C. The 175 V reverse voltage rating makes it suitable for moderate voltage signal processing tasks. Compare against other 1N49xx series variants if different voltage ratings or surface mount packages like the 1N4938UR-1 are needed for automated assembly processes.

Part Context

This part belongs to the 1N4938 family of standard silicon switching diodes manufactured by Microchip Technology. The family includes various packaging options such as axial leaded (DO-35) and surface mount (SOD-80/DO-213AA). The 1N4938-1 designation specifically refers to the axial through-hole version, while the /TR suffix denotes a specific reel-based shipping configuration.

Replacement Considerations

Compatible substitutes include the 1N4938UR-1 for surface mount implementations and generic equivalents like the 1N4448 for lower voltage applications. Verify pinout compatibility and ensure replacement parts meet the same 175 V and 100 mA specifications.