1N4994US

Single Zener Diodes Overview

The Microchip Technology 1N4994US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 330 V at a test current of 4 mA. It features a maximum dynamic impedance of 1175 Ohms and a reverse leakage current of 2 µA at 300 V. The device dissipates 5 Watts at an ambient temperature of 140°C, with a thermal resistance of 7°C/W from junction to end cap. It operates within a temperature range of -65°C to +175°C and has a maximum continuous current of 14.4 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass package with internal metallurgical bonds for high reliability
• Military qualified to MIL-PRF-19500/356 standards
• Inherently radiation hard construction
• ESD robust per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability military applications
• Space electronics systems
• Critical voltage regulation circuits where failure cannot be tolerated

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing date code against project requirements. Confirm that the supplier provides traceability documentation required for MIL-PRF-19500/356 compliance. Ensure storage conditions align with the specified operating temperature range to maintain hermetic seal integrity during handling and assembly processes.

Single Zener Diodes Selection Notes

Select this component when a 330 V regulation point is required in a surface mount form factor. Consider the high dynamic impedance compared to lower voltage variants. Verify that the 5 Watt power dissipation capability meets the thermal design constraints of the target application environment.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5 Watt Zener diodes. These devices share a common E-package (D-5B) footprint and voidless-glass construction. They are designed as direct replacements for axial-leaded versions by removing the US suffix, offering equivalent performance in a surface mount configuration.

Single Zener Diodes Replacement Considerations

Direct equivalents include JAN1N4994, JANTX1N4994, and JANTXV1N4994. Verify pinout compatibility and ensure the replacement maintains the same hermetic sealing and metallurgical bond specifications.