1N4738A-T

Overview

The Diodes Incorporated 1N4738A-T is a 1.0W Zener diode housed in a DO-41 glass package. It features a nominal Zener voltage of 8.2V with a standard tolerance of 5%. The device operates within a temperature range of -65°C to +175°C and includes lead-free, RoHS-compliant terminals. Maximum ratings include a power dissipation of 1.0W at 25°C and a thermal resistance of 175°C/W. Electrical characteristics specify a test current of 31mA, maximum Zener impedance of 4.5Ω at IZT and 700Ω at ZZK, and a reverse leakage current of 10µA at 6.0V.

Feature Summary

• Provides stable voltage regulation through Zener breakdown characteristics in the DO-41 glass case.
• Ensures environmental compliance with lead-free finish and RoHS certification.
• Supports high-temperature operation up to 175°C junction temperature.

Applications

• Voltage reference circuits requiring 8.2V stabilization
• Overvoltage protection for low-power electronic systems
• Clamping applications in signal processing paths

Procurement Notes

Verify component authenticity against official Diodes Incorporated documentation. Confirm the -T suffix indicates tape and reel packaging. Check for obsolescence status as the series is marked not recommended for new design. Ensure compatibility with existing PCB footprints for the DO-41 package before procurement.

Selection Notes

Select this component when an 8.2V Zener voltage is required with 1W power handling capability. Consider the 5% tolerance and specific impedance values for precision requirements. Evaluate the DO-41 package constraints and thermal management needs for ambient temperatures exceeding 50°C where derating applies.

Part Context

This part belongs to the 1N4728A-1N4761A series of 1.0W Zener diodes manufactured by Diodes Incorporated. The series covers a wide voltage range from 3.3V to 75V. The 1N4738A specifically targets the 8.2V segment of this lineup, sharing common mechanical and electrical specifications with its siblings.

Replacement Considerations

Diodes Incorporated recommends using the DFLZxx series instead of this product for new designs. Verify if alternative manufacturers offer equivalent 8.2V, 1W Zener diodes in DO-41 packages that meet the same electrical and mechanical specifications.