1N4748 G

Overview

The Microsemi Corporation 1N4748AG 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 and operates within an extended temperature range from -65 °C to +175 °C. Packaged in the DO-204AL (DO-41) axial through-hole format, it exhibits a maximum Zener impedance of 23 Ohms at a test current of 11.5 mA. The component utilizes a glass encapsulation providing hermetic sealing qualities.

Feature Summary

• Provides stable voltage regulation using a single silicon junction structure
• Features hermetically sealed glass encapsulation for environmental protection
• Offers lower thermal resistance compared to standard plastic body options

Applications

• Voltage reference circuits requiring precise regulation
• Overvoltage protection stages in electronic systems
• Power supply output stabilization modules

Procurement Notes

Verify the specific suffix designation when ordering, as variations such as AG denote distinct packaging or screening levels. Confirm RoHS compliance status explicitly, as certain variants may not meet current environmental directives. Ensure the procurement channel sources directly from authorized distributors to guarantee authenticity and traceability of the semiconductor batch.

Selection Notes

Select this component when high-temperature stability and hermetic sealing are required for critical applications. The glass package offers superior thermal performance relative to plastic equivalents. Consider the 22 V nominal rating and 1 W power dissipation limits against circuit requirements. Verify that the axial lead configuration fits the target PCB layout constraints effectively.

Part Context

This part belongs to the broader 1N47xx series of 1-watt Zener diodes manufactured by Microsemi. The series spans a wide voltage range from 3.3 V to 100 V. The 'G' suffix specifically identifies the glass-body construction, which provides hermetic sealing and higher temperature ratings compared to the plastic-bodied 'P' suffix variants within the same JEDEC numbering system.

Replacement Considerations

Equivalent parts include the 1N4748A and 1N4748AP. Note that the AP variant uses a plastic package rather than glass. Cross-referencing requires verifying the specific tolerance and thermal characteristics match the original design intent.