1N4738A-T50R

Overview

The Fairchild Semiconductor 1N4738A-T50R is a single silicon Zener diode with an 8.2 V nominal voltage and ±5% tolerance. It operates in the DO-41 axial lead package, dissipating up to 1.0 W at 25°C ambient temperature. The device features a maximum dynamic impedance of 4.5 Ω at a test current of 31 mA, with a reverse leakage current of 0.5 µA at 6 V. It supports a non-repetitive peak reverse surge current of 550 mA and functions within a temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation using a glass passivated junction for high reliability.
• Features low dynamic impedance to ensure consistent performance under varying load conditions.
• Designed with robust thermal characteristics allowing operation across extreme environmental temperatures.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in power supply systems
• Clamping applications in signal processing networks

Procurement Notes

Verify that the ordering suffix T50R corresponds to the Tape and Reel shipping format as specified in the official documentation. Confirm compliance with RoHS and Halide-free requirements before procurement. Ensure the component matches the JEDEC DO-41 mechanical outline dimensions for proper board integration.

Selection Notes

Select this component when a standard 8.2 V regulation point is required in through-hole designs. Evaluate the 1.0 W power dissipation capability against expected thermal loads. Consider the specific impedance and leakage parameters for precision requirements compared to alternative series members.

Part Context

This part belongs to the 1N4728A through 1N4758A family of Zener diodes manufactured by onsemi (formerly Fairchild). The series utilizes a standardized DO-41 glass case construction. The specific model provides an 8.2 V breakdown characteristic distinct from adjacent voltage ratings in the lineup.

Replacement Considerations

Substitute with other 1N4738A variants such as 1N4738ATR or 1N4738A-T50A if the electrical specifications match. Verify that any replacement maintains the same DO-41 footprint and 1.0 W power rating.

FAQ

What is the maximum power dissipation rating?

The maximum power dissipation is 1.0 W at an ambient temperature of 25°C, with a derating factor of 6.67 mW/°C above this threshold.

Does the device support high-temperature soldering?

Yes, the datasheet guarantees high-temperature soldering capabilities up to 260°C for a duration of 10 seconds with a 9.5 mm lead length.