1N4479D

Single Zener Diodes Overview

The Microchip Technology 1N4479D is a single Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 33 V with a tight tolerance of 1%. The device supports a maximum power dissipation of 1.5 W and exhibits a Zener impedance of 25 Ohms. Reverse leakage current is specified at 50 nA when tested at 31.2 V. The forward voltage drop is 1 V at a forward current of 200 mA. It operates within an extended temperature range from -65°C to +175°C and utilizes an axial DO-41 through-hole package.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using void-less glass technology for high reliability
• Internal metallurgical bond ensures structural integrity in harsh environments
• Military qualification compliant with MIL-PRF-19500/406 standards

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military-grade electronic circuits
• Critical voltage regulation in defense equipment

Single Zener Diodes Procurement Notes

Verify the specific suffix (e.g., D, US) against the official datasheet to confirm package type and compliance level. Ensure the procurement order explicitly states the required military qualification standard. Confirm that the supplier provides traceability documentation consistent with MIL-PRF-19500/406 requirements for this component series.

Single Zener Diodes Selection Notes

Select the 1N4479D when a precise 33 V reference is required in space-constrained or vibration-prone environments. The 1% tolerance makes it suitable for precision analog circuits. Consider the axial leaded form factor for compatibility with existing through-hole PCB layouts and automated insertion equipment used in legacy military designs.

Single Zener Diodes Part Context

This component belongs to the industry-recognized 1.5 W Zener voltage regulator series produced by Microchip Technology. The series includes various voltage selections ranging from 3.3 V to 200 V. These devices are specifically engineered for applications where failure cannot be tolerated, offering robust performance across extreme thermal conditions.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other military-qualified Zener diodes meeting MIL-PRF-19500/406 specifications. Verify that any replacement maintains the 33 V nominal voltage, 1% tolerance, and 1.5 W power rating. Ensure the alternative device offers equivalent hermetic sealing and operating temperature characteristics.