1N4738AG

Overview

The Microchip Technology 1N4738AG is a single Zener diode designed for voltage regulation applications. It features an 8.2 V nominal Zener voltage with a 5% tolerance, housed in a DO-41 glass axial leaded package. The device dissipates up to 1 W of power at 25°C ambient temperature and operates within a junction temperature range of -65°C to +200°C. Key electrical characteristics include a maximum reverse leakage current of 10 µA and a Zener impedance of 4.5 Ω at the test current of 31 mA.

Feature Summary

• Provides stable voltage regulation using a glass passivated junction structure.
• Offers high thermal stability suitable for demanding operating environments.
• Features low Zener impedance for effective noise filtering and regulation.

Applications

• Voltage reference circuits requiring precise DC levels
• Overvoltage protection stages in power supplies
• Clamping applications in signal conditioning paths

Procurement Notes

Verify the specific manufacturer designation as the 'AG' suffix typically denotes hermetic sealing in JEDEC standards, though availability varies by supplier. Confirm RoHS compliance status directly with the vendor, as historical data indicates mixed compliance records for this part number across different production eras. Ensure the package type matches the required through-hole mounting specifications.

Selection Notes

Select this component when a standard 8.2 V regulation point is required in a robust glass-encapsulated form factor. The DO-41 package provides reliable solderability and mechanical strength for general-purpose boards. Consider the 1 W power rating against expected dissipation to ensure operation remains within safe thermal limits without excessive heat sinking.

Part Context

This device belongs to the widely recognized 1N47 series of silicon Zener diodes. These components are standardized under JEDEC TO-204AA (DO-41) outlines, ensuring interchangeability among manufacturers. The 1N4738 variant specifically targets the 8.2 V segment of the 3.3 V to 100 V voltage range available in this family.

Replacement Considerations

Direct substitutes include the 1N4738A from other manufacturers such as Nexperia or LRC. For hermetic requirements, the MSP1N4738DGE3TR from Microsemi serves as a compatible alternative. Verify that replacement parts maintain the same 5% voltage tolerance and DO-41 footprint compatibility.