1N5255B-T

Single Zener Diodes Overview

The Diodes Incorporated 1N5255B-T is a discontinued 500mW epitaxial Zener diode with a nominal voltage of 28V and ±5% tolerance. It operates within a temperature range of -65°C to +175°C, featuring a maximum reverse current of 0.1µA at 21V and a Zener impedance of 44Ω at 4.5mA test current. The component utilizes a DO-35 glass axial package with Sn96.5Ag3.5 lead finish, weighing approximately 0.13 grams.

Single Zener Diodes Feature Summary

• Hermetic glass encapsulation for environmental stability
• Epitaxial construction ensuring high electrical stability
• Lead-free and RoHS compliant manufacturing finish

Single Zener Diodes Applications

• Voltage regulation in electronic circuits
• Voltage reference applications requiring stable biasing
• Overvoltage protection stages

Single Zener Diodes Procurement Notes

This part number is officially obsolete and discontinued by the manufacturer. Verify availability through authorized distributors or secondary markets only. Confirm that replacement components meet all original electrical specifications and mechanical dimensions before integration into existing designs.

Single Zener Diodes Selection Notes

Select verified equivalent components from other manufacturers offering identical 28V Zener characteristics in the DO-35 package. Ensure new selections maintain the required 500mW power dissipation rating and operate reliably across the specified -65°C to +175°C temperature range without altering circuit performance.

Single Zener Diodes Part Context

The 1N5255B-T belongs to the 1N5221B through 1N5267B series of 500mW Zener diodes produced by Diodes Incorporated. This specific model provides a 28V breakdown voltage. The entire series has been marked as obsolete, prompting the manufacturer to recommend surface mount equivalents for continued production needs.

Single Zener Diodes Replacement Considerations

Official documentation recommends using MMSZ52xxB series devices as replacements. Verify that selected substitutes match the 28V nominal voltage and 500mW power rating while accommodating any differences in physical footprint between axial and surface mount packages.

Single Zener Diodes FAQ

What is the thermal resistance of the junction to ambient air?

The thermal resistance from junction to ambient air is 300 °C/W.

What is the forward voltage specification?

The forward voltage is 1.1 V when tested at a forward current of 200 mA.