1N4965US

Overview

The Microchip Technology 1N4965US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 20 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 test current (IZT) of 65 mA, a dynamic impedance (ZZT) of 4.5 Ohms at IZT, and a maximum reverse leakage current (IR) of 2 µA at 15.2 V. The package is the D-5B-2 form factor, measuring 5.72 mm in length, 3.76 mm in width, and 3.76 mm in height.

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

Applications

• High-reliability military and aerospace circuits
• Voltage regulation in harsh environments
• Critical systems where component failure is not tolerated

Procurement Notes

Verify that the specific part number matches the required military qualification level and package style. Confirm compliance with RoHS directives if applicable, as standard versions may not be compliant. Ensure the ordering suffix aligns with the desired tolerance or testing requirements. Check for availability of tape and reel options versus bulk packaging based on assembly needs.

Selection Notes

Select this component when a 5 W surface mount Zener diode with military-grade hermetic sealing is required. Consider the 20 V nominal voltage and 4.5 Ohm dynamic impedance for circuit stability. Evaluate the thermal resistance and derating curves for operation above 140°C case temperature. Compare against axial-leaded equivalents if through-hole mounting is preferred.

Part Context

This device belongs to the 1N4954US through 1N4996US series of surface mount Zener regulators. These components share a common voidless-glass package and military qualification standard. The series offers a wide range of voltage selections from 3.3 V to 390 V, all utilizing the same D-5B-2 footprint and 5 W power rating architecture.

Replacement Considerations

Equivalent axial-leaded parts include the 1N4965 without the US suffix. Other surface mount variants in the same family include 1N4964US and 1N4966US for different voltage ratings.