1N5221A

Single Zener Diodes Overview

The Microchip Technology 1N5221A is a silicon Zener diode with a nominal voltage of 2.4 V and a tolerance of ±10%. It operates in the DO-35 (DO-204AH) glass axial-lead package, providing a maximum power dissipation of 0.5 W at 25°C. The device features a maximum reverse current of 100 µA at 1 V and a maximum Zener impedance of 1200 Ω at a test current of 20 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 environmental stability
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge (ESD)
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation over broad operating current ranges
• Reference voltage generation in electronic circuits
• Protection against voltage transients

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required JEDEC registration and tolerance suffix. Confirm compliance requirements such as RoHS status if applicable, noting that standard versions may not be compliant. Ensure the ordering prefix aligns with any necessary military screening levels like JAN or JANS. Check datasheet specifications for thermal derating curves relevant to your mounting configuration.

Single Zener Diodes Selection Notes

Select this component when a low-voltage reference around 2.4 V is needed with high reliability. Consider the negative temperature coefficient inherent to Zener voltages below approximately 5 V. Evaluate the thermal resistance of 250 °C/W junction-to-lead for heat dissipation planning. Verify that the DO-35 package dimensions fit the available PCB space.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators manufactured by Microsemi's Scottsdale Division. The series covers a wide voltage selection from 2.4 V to 200 V. The 1N5221A specifically represents the lower end of this voltage range with standard 10% tolerance.

Single Zener Diodes Replacement Considerations

Equivalent parts within the same series include 1N5221B for tighter 5% tolerance. Surface mount equivalents are available as MLL5221A in the DO-213AA MELF package. Other manufacturers producing JEDEC registered 1N5221 types may serve as functional substitutes if pinout and electrical parameters match.