1N4748A-T

Overview

The Diodes Incorporated 1N4748A-T is a discontinued 1.0 Watt Zener diode housed in a DO-41 glass axial package. It provides a nominal Zener voltage of 22V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a thermal resistance of 175°C/W. Electrical characteristics include a maximum Zener impedance of 23Ω at the test current of 11.5mA, a forward voltage of 1.2V at 200mA, and a maximum reverse leakage current of 5.0µA.

Feature Summary

• Glass passivated junction construction for stability
• Lead-free finish compliant with RoHS directives
• Standard cathode band polarity marking

Applications

• Voltage regulation circuits
• Overvoltage protection
• Reference voltage generation

Procurement Notes

This component is officially marked as obsolete and discontinued by Diodes Incorporated. No alternate part is available from the manufacturer. Procurement must rely on existing stock or secondary market sources. Verify authenticity and storage conditions carefully due to the long shelf life required for obsolete components.

Selection Notes

Designers should note that this specific part number is no longer in production. When selecting replacements, consider the electrical parameters such as the 22V nominal voltage, 1W power dissipation, and DO-41 package size. Ensure any substitute meets the required operating temperature range and impedance specifications.

Part Context

The 1N4748A belongs to the 1N4728A through 1N4761A series of 1.0 Watt Zener diodes produced by Diodes Incorporated. This series covers a wide voltage range from 3.3V to 75V. The '-T' suffix indicates the component was supplied in tape and reel packaging for automated assembly processes.

Replacement Considerations

Diodes Incorporated states there is no alternate part for this obsolete component. Users must source equivalents from other manufacturers or utilize generic 1N4748A variants if available, ensuring compatibility with the DO-41 package and 22V specification.