1N4966

Overview

The Microchip Technology 1N4966 is a military-qualified, voidless hermetically sealed 5-watt glass Zener diode. It provides a nominal Zener voltage of 22V at a test current of 50mA. The device features a maximum reverse leakage current of 2µA and a maximum continuous regulator current of 216mA. It supports a surge current of 7.0A for an 8.3ms square wave. The unit operates within a temperature range of -65°C to +175°C and utilizes an axial lead 'E' package.

Feature Summary

• Military qualified to MIL-PRF-19500/356 standards
• Voidless hermetically sealed glass construction with internal metallurgical bonds
• Inherently radiation hard
• ESD nonsensitive per MIL-STD-750 Method 1020

Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Industrial equipment operating in extreme temperatures

Procurement Notes

Verify the specific revision level and manufacturing origin when sourcing this component. Confirm that the supplier provides traceability documentation required for military qualification standards. Ensure the ordering suffix matches the desired tolerance or packaging configuration. Check for RoHS compliance status if applicable to the specific production lot. Validate that the component meets the exact MIL-PRF-19500/356 requirements for your application.

Selection Notes

Select the 1N4966 for applications requiring robust 5W power dissipation in harsh environments. Consider its wide operating temperature range and radiation hardness for space or defense use. Evaluate the 5% standard voltage tolerance against circuit precision needs. Compare thermal resistance characteristics with alternative packages if board space is constrained.

Part Context

This component belongs to the 1N4954 through 1N4996 series of 5-watt Zener voltage regulators manufactured by Microsemi (now Microchip Technology). These devices are industry-recognized for their reliability and are designed for critical applications where standard commercial parts may fail. The series offers a broad selection of voltages from 3.3V to 390V.

Replacement Considerations

Direct replacements must match the 5W power rating, 22V Zener voltage, and axial lead package. Verify that substitute parts also meet MIL-PRF-19500/356 military qualification if required. Surface-mount equivalents like the 1N4966US exist but require different footprint considerations.