1N4728A-T

Overview

The 1N4728A-T is a discontinued 1.0W silicon planar Zener diode manufactured by Diodes Incorporated in the DO-41 glass axial package. It features a nominal Zener voltage of 3.3V with a standard tolerance of 5%. The device operates within a temperature range of -65°C to +175°C and includes lead-free finish compliant with RoHS directives.

Feature Summary

• Hermetically sealed glass construction for stability
• Lead-free finish compatible with RoHS standards
• Standard 5% Zener voltage tolerance

Applications

• Voltage regulation circuits
• Clipping applications
• Reference voltage sources

Procurement Notes

This component is officially marked as obsolete and discontinued by Diodes Incorporated. No alternate part is provided by the manufacturer. Verification of current availability requires checking distributor channels, though production has ceased. Sourcing should focus on existing stock or qualified replacements.

Selection Notes

Select this component only if legacy compatibility is required, noting its discontinued status. Verify that the 3.3V nominal voltage and 1.0W power dissipation meet circuit requirements. Ensure the DO-41 package fits the design constraints. Consider obsolescence risks when planning long-term production.

Part Context

Part of the 1N4728A through 1N4761A series of 1.0W Zener diodes. The '-T' suffix indicates tape and reel packaging containing 5,000 units per reel. This series covers a voltage range from 3.3V to 75V.

Replacement Considerations

Diodes Incorporated states there is no alternate part. Users must identify equivalent components from other manufacturers or verify cross-references independently, as no official substitute is listed in the datasheet.

FAQ

What is the maximum surge current rating?

The maximum surge current (8.3ms) is 1380 mA.

Is the device RoHS compliant?

Yes, it has a lead-free finish and is RoHS compliant, subject to specific exemptions for glass and high-temperature solder.