1N4959US/TR

Overview

The Microchip Technology 1N4959US/TR is a military-qualified, surface-mount Zener voltage regulator with a nominal breakdown voltage of 11 V. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 5 W at an ambient case temperature of 140°C. The device features a test current of 125 mA, a maximum reverse leakage current of 10 µA, and a dynamic impedance of 2.5 Ω. It utilizes a voidless hermetically sealed glass package (D-5B) with copper end caps.

Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high-reliability applications
• Military qualification compliant with MIL-PRF-19500/356 standards
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

• High-reliability aerospace and defense circuits
• Critical power supply voltage regulation
• Harsh environment electronic systems

Procurement Notes

Verify the specific revision level and manufacturing origin against the latest official datasheet before integration. Confirm that the ordering suffix matches the required tape-and-reel packaging format. Ensure compliance with all applicable military specifications and material declarations required for your specific procurement contract.

Selection Notes

Select this component when a robust, surface-mount solution is required for critical voltage reference applications. The 5 W power rating supports substantial current handling in compact footprints. Verify thermal derating requirements if operating above the specified case temperature threshold.

Part Context

This part belongs to the industry-recognized 1N4954US through 1N4996US series of 5 Watt Zener Voltage Regulators. These devices are designed for applications where failure cannot be tolerated, offering extensive voltage selections from 3.3 to 390 volts with standard 5% tolerances.

Replacement Considerations

Axial-leaded equivalents are available by removing the US suffix. Other variants within the 1N4954US through 1N4996US series offer different voltage ratings but share identical mechanical and reliability characteristics.