1N5229B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5229B is a 0.5 W glass axial-lead Zener diode in the DO-35 (DO-204AH) package. It provides a nominal Zener voltage of 4.3 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 5 µA at 4.3 V. Electrical characteristics include a test current of 20 mA, a maximum Zener impedance of 22 Ω at 1 mA, and a voltage temperature coefficient of ±0.055 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• 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 that the ordering information matches the specific JEDEC registration requirements and tolerance levels needed for the application. Confirm whether additional military screening prefixes or RoHS compliant suffixes are required, as these modify the part number but do not change the fundamental electrical function of the component.

Single Zener Diodes Selection Notes

Select this component when a 4.3 V reference with ±5% tolerance is required in a through-hole axial package. Ensure the circuit design accommodates the specified thermal resistance and power derating curves. Consider tighter tolerance options if the application demands precision beyond the standard B suffix specification.

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 of voltages from 2.4 to 200 volts. These components are JEDEC registered and available in various screening levels and surface mount equivalents.

Single Zener Diodes Replacement Considerations

Equivalent parts include other manufacturers' 1N5229B devices meeting the same JEDEC specifications. Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package.