1N5221A (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5221A (DO-35) is a silicon Zener diode with a nominal voltage of 2.4 V and a tolerance of ±10%. It operates in the DO-35 glass axial-lead package, providing a power dissipation of 0.5 W at 25°C. The device features a maximum reverse current of 20 μA at 30 V and a dynamic impedance of 1200 Ω at a test current of 30 mA. It supports an operating temperature range from -65°C to +175°C.

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 ranges
• Temperature compensation circuits
• Reference voltage sources in electronic systems

Single Zener Diodes Procurement Notes

Verify the specific suffix 'A' confirms the ±10% tolerance requirement. Confirm the package style matches the DO-35 glass axial-lead specification. Ensure the manufacturer source aligns with Microsemi Scottsdale Division documentation. Check RoHS compliance status if required by the assembly process.

Single Zener Diodes Selection Notes

Select this component when a low-voltage reference near 2.4 V is needed with moderate precision. Consider the thermal resistance of 250 °C/W junction-to-lead for heat management. Evaluate the negative temperature coefficient for circuit stability across the specified temperature range.

Single Zener Diodes Part Context

This part belongs to the 1N5221 through 1N5281B series of 0.5 watt Zener Voltage Regulators. The series offers voltages from 2.4 to 200 volts. Variants include military screening prefixes and surface mount equivalents in the MELF package.

Single Zener Diodes Replacement Considerations

Equivalent parts within the same series include 1N5221B for tighter tolerances or 1N5221 without a suffix for standard JEDEC specifications. Surface mount alternatives are available as MLL5221.

Single Zener Diodes FAQ

What is the maximum reverse current for the 1N5221A?

The maximum reverse current is 20 μA when measured at 30 V.

How is the polarity indicated on the device?

The cathode is indicated by a band on the glass body. The banded end must be positive with respect to the opposite end for Zener regulation.