1N5281B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5281B is a silicon Zener diode housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 200V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and dissipates up to 0.5 watts at 25°C, derating to 0.48 watts when mounted on an FR4 printed circuit board. It features minimal capacitance and inherent radiation hardness.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Inherently radiation hard per MicroNote 050
• Minimal capacitance characteristics suitable for high-frequency applications
• Flexible mounting terminals compatible with standard through-hole processes

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in harsh environments
• Protection circuits requiring radiation hardness

Single Zener Diodes Procurement Notes

Verify the specific suffix requirements against the datasheet before ordering. The base part number indicates a ±5% tolerance. Confirm if RoHS compliance or internal bonds are required by checking for 'e3' or '-1' suffixes respectively. Ensure military screening prefixes are added only if explicitly specified in the design documentation.

Single Zener Diodes Selection Notes

Select this component for applications requiring a 200V breakdown voltage with tight manufacturing tolerances. Consider the thermal resistance of 250°C/W junction-to-lead when designing heat dissipation paths. Verify that the operating current stays within the limits defined in the electrical characteristics table to maintain stable regulation.

Single Zener Diodes Part Context

This device belongs to the popular 1N5221 through 1N5281B series of 0.5-watt Zener Voltage Regulators. The series offers a wide selection from 2.4 to 200 volts. The 1N5281B represents the highest voltage point in this specific JEDEC registered lineup, utilizing the standard DO-35 glass package.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available as MLL5281B in the DO-213AA MELF style package. Other manufacturers may offer direct replacements within the 1N5281B specification, but verify pinout and hermetic sealing requirements.