1N5259B-T

Single Zener Diodes Overview

The Diodes Incorporated 1N5259B-T is a discontinued 39V epitaxial Zener diode housed in a DO-35 glass axial package. It features a 500mW power dissipation rating and ±5% voltage tolerance. The device operates within a temperature range of -65°C to +175°C, with a maximum reverse current of 0.1µA at 30V.

Single Zener Diodes Feature Summary

• Epitaxial construction for high stability
• Hermetically sealed glass case
• Lead-free finish compliant with RoHS directives

Single Zener Diodes Applications

• Voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation

Single Zener Diodes Procurement Notes

This component is officially obsolete and discontinued by the manufacturer. Procurement must rely on third-party distributors or surplus markets. Verify authenticity carefully as unauthorized channels may exist. Confirm exact lot codes and physical condition before acquisition due to potential long-term storage effects.

Single Zener Diodes Selection Notes

Designers should transition to active alternatives immediately. The datasheet explicitly recommends using MMSZ52xxB surface mount equivalents. Evaluate thermal management requirements when switching packages, as the new components differ in mounting style and heat dissipation characteristics compared to the legacy axial leaded design.

Single Zener Diodes Part Context

Part of the 1N5221B through 1N5267B series of 500mW Zener diodes. This specific model provides a 39V nominal breakdown voltage. The series utilizes double slug type construction for reliability. Manufacturing has ceased in favor of modern surface mount technologies.

Single Zener Diodes Replacement Considerations

Use MMSZ52xxB series parts as direct replacements. Ensure the selected SMD variant matches the required voltage and power dissipation specifications. Adapt PCB layout to accommodate surface mount footprints instead of through-hole axial leads.