1N5231B (DO-35)

Single Zener Diodes Overview

The Microsemi 1N5231B is a silicon unidirectional Zener voltage regulator diode housed in a hermetically sealed glass axial-lead DO-35 package. It provides a nominal Zener voltage of 5.1 V with a standard tolerance of ±5% (indicated by the B suffix). The device operates at a test current of 20 mA and dissipates up to 0.5 W at 25°C. Key electrical parameters include a maximum reverse current of 17 µA, a dynamic impedance of 17 Ω at 20 mA, and a temperature coefficient of ±0.030 %/°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 and temperature ranges
• Reference voltage sources in electronic circuits
• Protection against voltage transients

Single Zener Diodes Procurement Notes

Verify the specific manufacturer prefix or suffix requirements when ordering, as these determine screening levels such as JAN, JANTX, or JANS, or packaging options like tape and reel. Confirm RoHS compliance status if required, which necessitates the 'e3' suffix. Ensure the lead length meets the specified 3/8 inch (10 mm) minimum for accurate thermal and electrical performance testing during integration.

Single Zener Diodes Selection Notes

Select this component for applications requiring a stable 5.1 V reference within the 0.5 W power dissipation limit. Consider the ±5% tolerance for general regulation needs. Evaluate the low capacitance feature for high-frequency sensitivity. Verify that the operating environment does not exceed the +175°C maximum junction temperature rating.

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 wide selection from 2.4 to 200 volts in standard 5% or 10% tolerances. These devices are JEDEC registered and available in various military screening levels with appropriate prefixes.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the DO-213AA MELF style package, designated as MLL5221 to MLL5281B. Other manufacturers produce compatible DO-35 Zener diodes with similar 5.1 V ratings and 0.5 W power dissipation capabilities.

Single Zener Diodes FAQ

What is the maximum operating temperature for the 1N5231B?

The maximum operating and storage temperature range is -65°C to +175°C.

How is polarity indicated on the device?

Polarity is indicated by a band on the glass body; the cathode end should be positive with respect to the opposite end for Zener regulation.