1N4748A

Overview

The onsemi 1N4748A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 22 V with a tolerance of ±5%. The device is rated for a maximum steady-state power dissipation of 1 W at ambient temperatures up to 50°C, requiring derating above this threshold. It utilizes a DO-41 glass axial package with two terminals and operates within a temperature range of -65°C to +200°C.

Feature Summary

• Hermetically sealed glass passivated junction for enhanced stability
• High thermal performance allowing operation up to 200°C
• Low inductance construction suitable for general switching

Applications

• Voltage reference circuits
• Overvoltage protection
• Clamping applications

Procurement Notes

Verify the specific manufacturer marking and datasheet revision when sourcing from third-party distributors. Confirm compliance requirements such as RoHS status, as legacy variants may differ. Ensure the DO-41 package dimensions match the target PCB footprint before integration into the design.

Selection Notes

Select this component for designs requiring a precise 22 V reference point with high thermal endurance. The 1 W power rating supports moderate current loads, while the wide operating temperature range makes it suitable for industrial environments where standard commercial grade parts would fail.

Part Context

This part belongs to the widely used 1N47xx series of Zener diodes, which provides standardized voltage ratings from 3.3 V to 75 V. The 1N4748A specifically addresses the 22 V segment of this family, offering a reliable solution for discrete voltage regulation tasks across various electronic systems.

Replacement Considerations

Equivalent parts include the Microsemi 1N4748AG and the Central Semiconductor 1N4748A. Verify pinout compatibility and thermal resistance characteristics when substituting.