1N5221B

Single Zener Diodes Overview

The Microchip Technology 1N5221B is a 0.5-watt glass axial-lead Zener voltage regulator housed in a hermetically sealed DO-35 package. It provides a nominal Zener voltage of 2.4 volts with a standard tolerance of plus or minus 5 percent, 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 30 microamperes at a reverse voltage of 30 volts. Electrical characteristics include a test current of 20 milliamperes, a maximum Zener impedance of 30 ohms at low currents, and a negative voltage temperature coefficient of -0.085 percent per degree Celsius.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for environmental protection
• Regulates voltage across a broad operating current and temperature range
• Inherently radiation hard according to MicroNote 050
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation circuits requiring stable reference voltages
• Overvoltage protection applications
• Clamping circuits in electronic systems

Single Zener Diodes Procurement Notes

Verify the specific part number against official datasheets to confirm the presence of the 'B' suffix for 5% tolerance and ensure compatibility with required screening levels. Confirm RoHS compliance status if applicable, as it requires an 'e3' suffix. Check for available military prefixes such as MQ, MX, MV, or MSP if specific MIL-PRF-19500 screening is necessary for the application environment.

Single Zener Diodes Selection Notes

Select this component when a precise 2.4-volt reference is needed with tight manufacturing tolerances. The DO-35 package suits through-hole mounting requirements. Consider the negative temperature coefficient for thermal stability analysis. Ensure the power dissipation limits are respected under actual operating conditions, utilizing derating curves for temperatures above 25°C.

Single Zener Diodes Part Context

This device belongs to the popular 1N5221 thru 1N5281B series of 0.5-watt Zener Voltage Regulators. The series offers a wide selection from 2.4 to 200 volts. The 1N5221B specifically represents the lowest voltage option in this JEDEC registered lineup, providing a foundational reference point for low-voltage regulator designs.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF style package. These provide a direct footprint alternative while maintaining similar electrical characteristics.