1N4973US

Single Zener Diodes Overview

The Microchip Technology 1N4973US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 43 V at a test current of 30 mA. It features a maximum reverse leakage current of 2 µA and a dynamic impedance of 20 Ohms at the test point. The device dissipates 5 Watts at an ambient temperature of 140°C, operating within a junction temperature range of -65°C to +175°C. It utilizes a D-5B-2 package with a thermal resistance of 7°C/W from junction to end cap.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high reliability
• Military qualified to MIL-PRF-19500/356 standards
• Triple-layer passivation provides robust protection against environmental stress

Single Zener Diodes Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Radiation-hardened circuit designs

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military qualification level and suffix designations. Confirm the package type corresponds to the surface mount D-5B-2 configuration. Ensure compliance with the specified hermetic sealing requirements for your application environment.

Single Zener Diodes Selection Notes

Select this component when a 5 Watt surface mount Zener diode is required for critical applications. Consider the 43 V breakdown voltage and 20 Ohm dynamic impedance for regulation needs. Evaluate the -65°C to +175°C operating range against your system's thermal constraints.

Single Zener Diodes Part Context

This component belongs to the 1N4954US through 1N4996US series of surface mount Zener regulators. These devices are designed for demanding environments where standard commercial parts may fail. The series offers various voltage options within the same physical footprint.

Single Zener Diodes Replacement Considerations

JANTXV1N4973US/TR

Single Zener Diodes FAQ

What is the thermal resistance of the 1N4973US?

The thermal resistance from junction to end cap is 7°C/W.

Is the 1N4973US radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.