1N5280A

Single Zener Diodes Overview

The Microchip Technology 1N5280A is a 0.5 W glass axial-lead Zener diode with a nominal voltage of 190 V and a ±10% tolerance. It operates within a temperature range of -65°C to +175°C, featuring a maximum reverse current of 137 µA at 171 V and a zener impedance of 6500 Ω at 0.25 mA. The device utilizes a hermetically sealed DO-35 package with tin-lead or RoHS-compliant matte-tin plating.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for high reliability
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge (ESD)
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation in broad operating current ranges
• High-reliability aerospace and defense circuits
• Harsh environment electronic systems requiring radiation hardness

Single Zener Diodes Procurement Notes

Verify the specific suffix 'A' confirms the 10% tolerance specification. Confirm the presence of the 'e3' suffix if RoHS compliance is required, as standard versions may use tin-lead plating. Ensure the ordering prefix matches any necessary military screening levels such as JAN or JANS.

Single Zener Diodes Selection Notes

Select this component when a 190 V reference is needed in a ruggedized axial-lead package. Consider the high zener impedance and negative temperature coefficient below 5 V, though this part operates well above that threshold. Verify thermal derating requirements against the power dissipation curve for the specific mounting conditions.

Single Zener Diodes Part Context

This device belongs to the popular 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. The series provides a wide selection from 2.4 to 200 volts. The 1N5280A specifically represents the higher voltage end of this standard JEDEC registered lineup.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package. Other manufacturers produce JEDEC registered equivalents, but verify electrical parameters and package dimensions match the design requirements.