1N5229A (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5229A 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 4.3V with a standard tolerance of ±10%, indicated by the 'A' suffix. The device operates within a temperature range of -65°C to +175°C and dissipates up to 0.5 watts at 25°C, or 0.48 watts when mounted on an FR4 printed circuit board.

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
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Overvoltage protection components

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required JEDEC registration and tolerance level. Confirm the presence of the 'A' suffix for the 10% tolerance specification. Ensure the package type corresponds to the DO-35 glass axial-lead configuration. Check for any additional prefixes indicating military screening levels if applicable to the design requirements.

Single Zener Diodes Selection Notes

Select this component for applications requiring a stable 4.3V reference with moderate power dissipation capabilities. Consider the thermal resistance values when designing heat dissipation strategies. Evaluate the low capacitance feature if signal integrity is critical. Verify compatibility with the intended mounting method and lead length constraints.

Single Zener Diodes Part Context

This component belongs to the popular 1N5221 through 1N5281B series of 0.5 watt Zener Voltage Regulators manufactured by Microsemi's Scottsdale Division. The series offers a wide selection of voltages from 2.4 to 200 volts in various tolerances. These devices are JEDEC registered and provide surface mount equivalents in the MELF style package.

Single Zener Diodes Replacement Considerations

Equivalent parts include the MLL5229A in the DO-213AA MELF package for surface mount applications. RoHS compliant versions are available with the 'e3' suffix, such as 1N5229AE3.