1N4992

Single Zener Diodes Overview

The Microchip Technology 1N4992 is a military-qualified, voidless hermetically sealed glass Zener diode rated for 5 watts of power dissipation. It provides a nominal Zener voltage of 270 V at a test current of 5 mA. The device features a standard 5% voltage tolerance and operates within a junction temperature range of -65°C to +175°C. Key electrical specifications include a maximum reverse leakage current of 2 µA at 2100 V, a maximum continuous regulator current of 17.5 mA, and a surge current rating of 0.35 A. The component utilizes axial leads with a tin/lead finish.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using voidless hard glass and tungsten slugs
• Military qualification compliant with MIL-PRF-19500/356 standards
• Robust metallurgical bonds ensuring high reliability in critical applications
• Inherent radiation hardness suitable for harsh environments

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military-grade electronic circuits
• Critical voltage regulation where failure is not tolerated

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix (e.g., JAN, JANTX) to confirm the exact quality level and compliance requirements. Confirm that the lead finish matches the design specification, as previous inventory may have utilized solid silver leads instead of the standard tin/lead finish. Ensure the procurement documentation references the correct revision of the datasheet to validate all electrical parameters.

Single Zener Diodes Selection Notes

Select this component when a high-voltage Zener reference is required in a ruggedized environment. The 5-watt power rating allows for significant current handling compared to lower-power equivalents. Verify that the circuit can accommodate the 270 V breakdown voltage and that the thermal management strategy supports the specified derating curve above 65°C lead temperature.

Single Zener Diodes Part Context

This part belongs to the 1N4954 through 1N4996 series of 5-watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a wide voltage range from 3.3 V to 390 V. These components are distinguished by their voidless-glass construction and internal metallurgical bonding, designed specifically for demanding industrial and defense applications requiring long-term stability.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 270 V nominal voltage, 5 W power rating, and axial lead package. Equivalent parts should offer similar hermetic sealing and military qualification if the application requires it. Surface-mount alternatives exist in the US suffix series but require different footprint considerations.