1N4974US

Single Zener Diodes Overview

The Microchip Technology 1N4974US is a military-qualified, surface-mount Zener voltage regulator designed for high-reliability applications. It features a voidless hermetically sealed glass package with an internal metallurgical bond. The device provides a nominal Zener voltage of 47 V at a test current of 25 mA. It supports a maximum power dissipation of 5 Watts and operates within a temperature range of -65°C to +175°C. Key electrical parameters include a dynamic impedance of 25 Ohms at the test current, a maximum reverse leakage current of 2 µA, and a surge current rating of 3.2 A.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds
• Military qualification per MIL-PRF-19500/356
• Robust design inherently resistant to electrostatic discharge

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify that the component meets the specific military qualification standards required for your application. Confirm the package type matches your PCB layout requirements. Ensure thermal management strategies account for the specified power dissipation limits. Check for any specific handling instructions related to the hermetic seal integrity during assembly.

Single Zener Diodes Selection Notes

Select this component when a surface-mount solution is required for critical voltage regulation tasks. Consider the 5W power rating and wide operating temperature range for demanding environments. Evaluate the need for military-grade reliability and radiation hardness compared to commercial alternatives. Ensure the 47V breakdown voltage aligns with the circuit's reference or protection needs.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of surface-mount Zener diodes. These devices are manufactured by Microsemi (now part of Microchip Technology) in their Scottsdale Division. The series offers various voltage options within a standardized 5-watt surface-mount package, providing a robust alternative to traditional axial-leaded packages for space-constrained designs.

Single Zener Diodes Replacement Considerations

For equivalent axial-leaded performance, consider the 1N4974 without the US suffix. Other parts in the same series, such as the 1N4973US or 1N4975US, offer similar construction with different voltage ratings.