1N5221B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5221B is a single silicon Zener diode housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 2.4V 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. Electrical characteristics include a maximum reverse current of 20μA at 1V, a test current of 30mA, and a dynamic impedance of 30Ω at 100μA.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Inherently radiation hard per MicroNote 050
• Minimal capacitance across the operating range
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation over broad operating currents and temperatures
• Reference voltage sources in electronic circuits
• Protection against voltage transients

Single Zener Diodes Procurement Notes

Verify that the component matches the specific JEDEC registered type number and suffix requirements. Confirm the package style is the glass DO-35 axial lead variant. Ensure the manufacturer source aligns with Microsemi specifications for electrical tolerances and screening levels before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component when a low nominal voltage reference near 2.4V is required. The B suffix indicates a tighter ±5% tolerance compared to the A suffix. Consider the negative temperature coefficient inherent to voltages below 5V. Verify thermal derating requirements if operating above ambient temperatures or on FR4 boards.

Single Zener Diodes Part Context

This part belongs to the popular 1N5221 through 1N5281B series of 0.5 watt Zener Voltage Regulators. The series offers a selection from 2.4 to 200 volts. The 1N5221B specifically represents the lowest voltage option in the standard JEDEC registered lineup with tight manufacturing tolerances.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available as MLL5221 to MLL5281B in the DO-213AA MELF style package. Other manufacturers may offer generic 1N5221B replacements, but verify that critical parameters like dynamic impedance and leakage current match the original specifications.