1N4738A-T50A

Overview

The onsemi 1N4738A-T50A is a Zener diode with a nominal voltage of 3.9V and a power dissipation rating of 1W. It features a 5% voltage tolerance and a maximum reverse leakage current of 50µA. The device has a Zener impedance of 9 ohms and operates within a temperature range of -65°C to +175°C. It utilizes a DO-41-2 through-hole package.

Feature Summary

• Provides stable voltage regulation at 3.9V with 5% tolerance
• Handles 1W power dissipation in a glass passivated axial leaded package
• Designed for high-temperature operation up to 175°C

Applications

• Voltage reference circuits
• Overvoltage protection
• Power supply regulation

Procurement Notes

Verify the specific suffix T50A against official datasheets, as standard 1N4738A devices typically specify an 8.2V Zener voltage. Confirm availability status, as this part number may be discontinued or restricted in certain regions. Ensure the 3.9V specification aligns with design requirements rather than assuming standard numbering conventions.

Selection Notes

Select this component when a precise 3.9V regulation point is required in through-hole designs. Verify that the 1W power rating and 9-ohm impedance meet circuit load conditions. Check compatibility with operating temperatures up to 175°C. Consider alternative manufacturers if the specific T50A suffix limits sourcing options.

Part Context

This component belongs to the 1N47 series of Zener diodes manufactured by onsemi. While the base 1N4738 designation often corresponds to 8.2V devices in general industry standards, this specific variant is documented with a 3.9V rating. The T50A suffix indicates specific packaging or testing criteria defined by the manufacturer.

Replacement Considerations

Cross-reference with other 3.9V Zener diodes in the DO-41 package from different manufacturers. Verify electrical parameters such as impedance and leakage current match the original specifications before substitution.