1N5279B

Single Zener Diodes Overview

The Microchip Technology 1N5279B is a 0.5-watt glass axial-lead Zener voltage regulator in the DO-35 package. It provides a nominal Zener voltage of 180 V with a standard tolerance of ±5% (indicated by the B suffix). The device operates within a temperature range of -65°C to +175°C and features a maximum reverse current of 0.1 µA at 137 V. Electrical characteristics include a test current of 0.68 mA, a maximum Zener impedance of 2200 Ohms at the test current, and a maximum temperature coefficient of +0.110 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for environmental stability
• Regulates voltage across a broad operating current and temperature range
• Inherently radiation hard per MicroNote 050
• Minimal capacitance suitable for high-frequency applications

Single Zener Diodes Applications

• Voltage regulation in electronic circuits
• Reference voltage sources
• Overvoltage protection

Single Zener Diodes Procurement Notes

Verify the specific manufacturer source, as Microsemi was acquired by Microchip Technology. Confirm that the part number corresponds to the correct JEDEC registration and tolerance level. Ensure the ordering suffix matches the required voltage tolerance and screening level if military specifications are needed. Check RoHS compliance status based on the specific manufacturing batch or suffix.

Single Zener Diodes Selection Notes

Select this component when a stable 180 V reference is required in a low-power application. The DO-35 package is suitable for through-hole mounting. Consider the positive temperature coefficient for thermal compensation needs. Verify that the power dissipation requirements do not exceed 0.5 watts without derating. Evaluate the high Zener impedance against circuit loading requirements.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5-watt Zener diodes. The series covers a voltage range from 2.4 V to 200 V. The 1N5279B represents the higher voltage end of the standard JEDEC registered lineup. Variants exist with different tolerances and surface mount equivalents.

Single Zener Diodes Replacement Considerations

Equivalent parts include other manufacturers' 1N5279B devices meeting the same electrical specifications. Surface mount equivalents like MLL5279B are available in the DO-213AA MELF package. Military screened versions may require specific prefixes such as MQ, MX, MV, or MSP.