1N5279B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5279B is a 0.5-watt glass axial-lead Zener voltage regulator housed in a hermetically sealed DO-35 (DO-204AH) package. It provides a nominal Zener voltage of 180 V with a standard tolerance of ±5% for the B suffix. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse current of 100 µA at 137 V. Electrical characteristics include a test current of 0.68 mA, a maximum Zener impedance of 2200 Ohms at 0.25 mA, and a positive voltage temperature coefficient of +0.110 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation over broad operating currents
• Temperature compensation circuits
• Reference voltage sources

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required JEDEC registration and tolerance suffix. Confirm RoHS compliance status by checking for the e3 suffix if lead-free soldering is required. Ensure the ordering prefix aligns with any necessary military screening levels such as JAN or JANS. Cross-reference thermal derating curves against the intended mounting conditions on FR4 PCBs.

Single Zener Diodes Selection Notes

Select this component for applications requiring high-voltage regulation up to 200 V in a compact axial-lead form factor. Consider the positive temperature coefficient when designing for wide thermal environments. Evaluate the maximum Zener impedance for dynamic load requirements. Verify that the 0.5 W power dissipation rating meets the circuit's steady-state and peak power demands.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5 watt Zener Voltage Regulators. The series offers a selection from 2.4 to 200 volts with various tolerance options identified by suffix letters. These components are JEDEC registered and available in standard commercial grades as well as military screening levels with specific prefixes.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF style package. Glass body axial-leaded DO-7 equivalents are also offered by the manufacturer.