1N4738ATR

Overview

The Fairchild Semiconductor 1N4738ATR is a single silicon Zener diode designed for voltage regulation and reference applications. It features an 8.2V nominal Zener voltage with a 5% tolerance, operating at a test current of 31mA. The device dissipates up to 1W of power and exhibits a maximum dynamic impedance of 4.5 ohms. Packaged in the DO-41 axial leaded glass enclosure, it supports through-hole mounting and operates within a temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction
• Encased in hermetically sealed glass DO-41 package for environmental protection
• Capable of handling high surge currents while maintaining low reverse leakage

Applications

• General-purpose voltage regulation circuits
• Voltage reference sources in electronic systems
• Overvoltage protection stages

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheets. Confirm compliance status as this specific part variant may differ from standard RoHS versions. Ensure the DO-41 glass package matches design requirements before integration into production assemblies.

Selection Notes

Select this component when a robust 8.2V reference is required in an axial glass package. Consider the 4.5 ohm dynamic impedance for precision needs. Verify thermal management capabilities for 1W dissipation in enclosed environments compared to plastic alternatives.

Part Context

This device belongs to the 1N47 series of general-purpose Zener diodes manufactured by Fairchild Semiconductor. The series offers various voltage ratings in standardized packages. The ATR suffix typically indicates tape and reel packaging for automated assembly processes.

Replacement Considerations

Equivalent parts include Microsemi MV1N4738APTR and LRC 1N4738A. Verify pinout compatibility and package dimensions before substitution.