1N4492US

Single Zener Diodes Overview

The Microchip Technology 1N4492US is a surface mount Zener voltage regulator qualified to MIL-PRF-19500/406. It features a hermetically sealed void-less glass package with an internal metallurgical bond. The nominal Zener voltage is 130 V at a test current of 1.9 mA. Maximum dynamic impedance is 500 Ohms, and maximum reverse current is 0.25 µA. Steady-state power dissipation is 1.5 W at 25°C ambient temperature. Operating junction and storage temperatures range from -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed void-less glass construction with tungsten slugs for robust reliability.
• Internal Category 1 metallurgical bonds ensuring structural integrity in high-reliability environments.
• Triple-layer passivation providing protection against environmental stressors.
• Inherently radiation hard design suitable for demanding operational conditions.

Single Zener Diodes Applications

• High-reliability military systems requiring failure-tolerant voltage regulation.
• Spacecraft electronics utilizing radiation-hardened components.
• Avionics circuits operating across extreme temperature ranges.

Single Zener Diodes Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for the application, as these levels dictate testing standards and reliability metrics. Confirm RoHS compliance status if applicable, noting that compliant versions are available only on commercial grades. Ensure the ordering suffix matches the desired tolerance and packaging configuration before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component for applications requiring a 130 V reference in a surface mount form factor. Evaluate thermal management requirements based on the 1.5 W steady-state power dissipation limit. Consider the 500 Ohm dynamic impedance for circuit stability needs. Verify that the D-5A MELF package dimensions fit the PCB layout constraints.

Single Zener Diodes Part Context

This device belongs to the 1N4460US through 1N4496US series of 1.5 Watt glass Zener diodes. These parts serve as surface mount equivalents to popular JEDEC registered axial-lead series. The series offers extensive voltage selections from 3.3 to 200 Volts with standard 5% tolerance options.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 1N4492US electrical characteristics and MIL-PRF-19500/406 qualification. Equivalent surface mount Zener regulators with identical voltage and package specifications should be evaluated for compatibility.