1N4938TR

Overview

The onsemi 1N4938TR is a small signal silicon rectifier diode designed for general-purpose switching applications. It features a maximum repetitive reverse voltage of 200 V and an average rectified forward current rating of 500 mA. The device operates with a junction temperature range up to 175 °C and a storage temperature range from -65 °C to +200 °C. Electrical characteristics include a forward voltage of 1.0 V at 100 mA, a reverse leakage current of 100 nA at 75 V, and a total capacitance of 5 pF at 0 V bias. The component utilizes a DO-35 axial leaded package.

Feature Summary

• Provides high-speed switching capability with a reverse recovery time of 50 ns.
• Engineered for robust thermal performance with a power dissipation rating of 500 mW.
• Constructed using silicon technology suitable for standard electronic circuit protection.

Applications

• General-purpose rectification in low-power circuits
• Signal clamping and protection
• High-speed switching operations

Procurement Notes

Verify the specific manufacturer designation, as the 1N4938 specification originates from Fairchild Semiconductor, which was acquired by onsemi. Confirm that the TR suffix indicates tape and reel packaging compatible with automated assembly processes. Ensure compliance with the absolute maximum ratings provided in the datasheet to prevent device impairment during operation.

Selection Notes

Select this component when a 200 V reverse voltage rating and 500 mA continuous forward current are required. The DO-35 package is appropriate for through-hole mounting configurations. Consider the 50 ns reverse recovery time for applications requiring faster switching speeds than standard slow-recovery diodes offer.

Part Context

The 1N4938 is a widely recognized standard small-signal diode originally defined by Fairchild Semiconductor. The 1N4938TR variant specifically denotes the same electrical specifications packaged in tape and reel format for efficient surface mount or automated through-hole placement systems within manufacturing workflows.

Replacement Considerations

Direct replacements must match the 200 V reverse voltage, 500 mA current rating, and DO-35 package form factor. Verify that substitute components maintain equivalent reverse recovery times and forward voltage characteristics to ensure circuit compatibility.