1N4976US

Single Zener Diodes Overview

The Microchip Technology 1N4976US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 56 V and a maximum power dissipation of 5 W. It operates within a junction temperature range of -65°C to +175°C. The device features a standard voltage tolerance of ±5% and a test current (IZT) of 20 mA. Electrical characteristics include a maximum dynamic impedance (ZZT) of 35 Ohms at the test current, a maximum reverse leakage current of 2 µA at 42.6 V, and a forward voltage of 1.5 V at 1 A.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction utilizing internal metallurgical bonds for high reliability
• Military qualification compliant with MIL-PRF-19500/356 standards
• Triple-layer passivation providing robustness against electrostatic discharge
• Inherently radiation hard design suitable for demanding environments

Single Zener Diodes Applications

• High-reliability aerospace and defense systems
• Voltage regulation in harsh industrial environments
• Circuit protection where failure cannot be tolerated

Single Zener Diodes Procurement Notes

Verify that the component matches the specific military qualification requirements of MIL-PRF-19500/356. Confirm the package type corresponds to the D-5B surface mount configuration. Ensure the supplier provides documentation validating the hermetic seal integrity and metallurgical bond quality. Check for any specific handling instructions related to the glass construction.

Single Zener Diodes Selection Notes

Select this component when a 56 V regulation point is required in a surface mount layout. Consider the 5 W power rating and thermal resistance of 7°C/W for heat dissipation calculations. Evaluate the ±5% tolerance against circuit precision needs. Compare the 35 Ohm dynamic impedance against load regulation requirements. Verify compatibility with the -65°C to +175°C operating temperature range.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5 Watt Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are industry-recognized for their voidless-glass construction and are designed for applications requiring extreme durability. The series offers various voltage selections from 3.3 V to 390 V.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents such as the 1N4976 are available by removing the US suffix. Other variants within the same series may offer tighter voltage tolerances using C or D suffixes.